Full Code of goldmansachs/gs-collections-kata for AI

Repository: goldmansachs/gs-collections-kata
Branch: master
Commit: a0282590141c
Files: 39
Total size: 57.9 KB

Directory structure:
gitextract_6hnlp4sq/

├── .classpath
├── .idea/
│   ├── copyright/
│   │   ├── Apache.xml
│   │   └── profiles_settings.xml
│   ├── libraries/
│   │   └── lib.xml
│   ├── misc.xml
│   ├── modules.xml
│   └── runConfigurations/
│       └── All_in_GSCollectionsKata.xml
├── .project
├── .settings/
│   └── org.eclipse.jdt.core.prefs
├── GSCollectionsKata.iml
├── LICENSE-2.0.txt
├── NOTICE
├── README.md
├── lib/
│   ├── gs-collections-6.0.0.jar
│   ├── gs-collections-api-6.0.0.jar
│   ├── gs-collections-testutils-6.0.0.jar
│   ├── hamcrest-core-1.3.jar
│   ├── hamcrest-library-1.3.jar
│   ├── junit-4.12.jar
│   └── source/
│       ├── gs-collections-6.0.0-sources.jar
│       ├── gs-collections-api-6.0.0-sources.jar
│       ├── gs-collections-testutils-6.0.0-sources.jar
│       ├── hamcrest-core-1.3-sources.jar
│       ├── hamcrest-library-1.3-sources.jar
│       └── junit-4.12-sources.jar
└── src/
    ├── main/
    │   └── java/
    │       └── com/
    │           └── gs/
    │               └── collections/
    │                   └── kata/
    │                       ├── Company.java
    │                       ├── Customer.java
    │                       ├── LineItem.java
    │                       ├── Order.java
    │                       └── Supplier.java
    └── test/
        └── java/
            └── com/
                └── gs/
                    └── collections/
                        └── kata/
                            ├── CompanyDomainForKata.java
                            ├── Exercise1Test.java
                            ├── Exercise2Test.java
                            ├── Exercise3Test.java
                            ├── Exercise4Test.java
                            ├── Exercise5Test.java
                            ├── Exercise6Test.java
                            ├── Exercise7Test.java
                            └── Exercise8Test.java

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FILE CONTENTS
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FILE: .project
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<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>GS Collections Kata</name>
	<comment></comment>
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FILE: .settings/org.eclipse.jdt.core.prefs
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#Fri Dec 23 13:01:22 EST 2011
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
org.eclipse.jdt.core.compiler.compliance=1.6
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
org.eclipse.jdt.core.compiler.debug.localVariable=generate
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
org.eclipse.jdt.core.compiler.source=1.6


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FILE: GSCollectionsKata.iml
================================================
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    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="lib" level="project" />
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</module>



================================================
FILE: LICENSE-2.0.txt
================================================

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================================================
FILE: NOTICE
================================================
GS Collections Kata
Copyright 2011 Goldman Sachs

This product includes software (JUnit) developed by
JUnit.org (http://www.junit.org/).


================================================
FILE: README.md
================================================
# GS Collections Kata

## What is a Code Kata?
A _kata_ is an exercise in martial arts. A code kata is an exercise in programming which helps hone your skills through practice and repetition. You can find out more about code Katas in general [here](http://codekata.pragprog.com).

## What is the GS Collections Code Kata?
The GS Collections Kata is a fun way to help you learn idiomatic GS Collections usage. This particular kata is set up as a series of unit tests which fail. Your task is to make them pass, using GS Collections. The Kata is meant to take approximately one eight-hour day.

New concepts are introduced in the [slides](http://www.goldmansachs.com/gs-collections/documents/GS Collections Training Session and Kata 5.0.0.pdf), with coding exercises at the end of each section. As you complete each exercise, you can check your answers against the [solutions branch](https://github.com/goldmansachs/gs-collections-kata/tree/solutions).

Make sure you read the instructor notes in the slides. In addition, you can refer to the [GS Collections Reference Guide](http://www.goldmansachs.com/gs-collections/documents/GS Collections Reference Guide 5.0.0.pdf) for further detail and examples of the API.


================================================
FILE: src/main/java/com/gs/collections/kata/Company.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.list.mutable.FastList;
import org.junit.Assert;

/**
 * A company has a {@link MutableList} of {@link Customer}s.  It has an array of {@link Supplier}s, and a name.
 */
public class Company
{
    private final String name;
    private final MutableList<Customer> customers = FastList.newList();

    // suppliers are array based.
    private Supplier[] suppliers = new Supplier[0];

    public Company(String name)
    {
        this.name = name;
    }

    public String getName()
    {
        return this.name;
    }

    public void addCustomer(Customer aCustomer)
    {
        this.customers.add(aCustomer);
    }

    public MutableList<Customer> getCustomers()
    {
        return this.customers;
    }

    public MutableList<Order> getOrders()
    {
        Assert.fail("Refactor this code to use GS Collections as part of Exercise 3");
        MutableList<Order> orders = FastList.newList();
        for (Customer customer : this.customers)
        {
            orders.addAll(customer.getOrders());
        }
        return orders;
    }

    public Customer getMostRecentCustomer()
    {
        return this.customers.getLast();
    }

    public void addSupplier(Supplier supplier)
    {
        // need to replace the current array of suppliers with another, larger array
        // Of course, normally one would not use an array.

        final Supplier[] currentSuppliers = this.suppliers;
        this.suppliers = new Supplier[currentSuppliers.length + 1];
        System.arraycopy(currentSuppliers, 0, this.suppliers, 0, currentSuppliers.length);
        this.suppliers[this.suppliers.length - 1] = supplier;
    }

    public Supplier[] getSuppliers()
    {
        return this.suppliers;
    }

    public Customer getCustomerNamed(String name)
    {
        /**
         * Use a {@link Predicate} to find a {@link Customer} with the name given.
         */
        Assert.fail("Implement this method as part of Exercise 2");
        return null;
    }
}


================================================
FILE: src/main/java/com/gs/collections/kata/Customer.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.ArrayList;
import java.util.List;

import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.block.function.AddFunction;
import com.gs.collections.impl.utility.ListIterate;
import org.junit.Assert;

/**
 * Customers have a name, city and a list of {@link Order}s
 */
public class Customer
{
    public static final Function<Customer, String> TO_NAME = customer -> {
        Assert.fail("Replace with the implementation of the Function.");
        return null;
    };

    public static final Function<Customer, String> TO_CITY = null;

    public static final Function<Customer, Double> TO_TOTAL_ORDER_VALUE = Customer::getTotalOrderValue;

    private final String name;
    private final String city;

    private final List<Order> orders = new ArrayList<>();

    public Customer(String name, String city)
    {
        this.name = name;
        this.city = city;
    }

    public String getCity()
    {
        return this.city;
    }

    public String getName()
    {
        return this.name;
    }

    public List<Order> getOrders()
    {
        return this.orders;
    }

    public void addOrder(Order anOrder)
    {
        this.orders.add(anOrder);
    }

    public double getTotalOrderValue()
    {
        MutableList<Double> orderValues = ListIterate.collect(this.orders, Order::getValue);
        return orderValues.injectInto(0.0, AddFunction.DOUBLE_TO_DOUBLE);
    }
}


================================================
FILE: src/main/java/com/gs/collections/kata/LineItem.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.block.function.Function;

/**
 * An Item has a name and a value.
 */
public class LineItem
{
    public static final Function<LineItem, String> TO_NAME = LineItem::getName;

    private String name;
    private final double value;

    public String getName()
    {
        return this.name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public double getValue()
    {
        return this.value;
    }

    public LineItem(String name, double value)
    {
        this.name = name;
        this.value = value;
    }

    @Override
    public String toString()
    {
        return this.name + " $ " + this.getValue();
    }
}


================================================
FILE: src/main/java/com/gs/collections/kata/Order.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.gs.collections.api.block.function.Function;
import com.gs.collections.impl.block.function.AddFunction;
import com.gs.collections.impl.collection.mutable.CollectionAdapter;
import com.gs.collections.impl.utility.Iterate;

/**
 * Has a number, a {@link Customer}, a {@link List} of {@link LineItem}s, and a boolean that states whether or not the order
 * has been delivered. There is a class variable that contains the next order number.
 */
public class Order
{
    public static final Function<Order, Double> TO_VALUE = Order::getValue;

    public static final Function<Order, Iterable<LineItem>> TO_LINE_ITEMS = Order::getLineItems;

    private static int nextOrderNumber = 1;

    private final int orderNumber;
    private final List<LineItem> lineItems = new ArrayList<>();
    private boolean isDelivered;

    public Order()
    {
        this.orderNumber = nextOrderNumber;
        nextOrderNumber += 1;
    }

    public static void resetNextOrderNumber()
    {
        nextOrderNumber = 1;
    }

    public void deliver()
    {
        this.isDelivered = true;
    }

    public boolean isDelivered()
    {
        return this.isDelivered;
    }

    public void addLineItem(LineItem aLineItem)
    {
        this.lineItems.add(aLineItem);
    }

    public List<LineItem> getLineItems()
    {
        return this.lineItems;
    }

    @Override
    public String toString()
    {
        return "order " + this.orderNumber + " items: " + this.lineItems.size();
    }

    public double getValue()
    {
        Collection<Double> itemValues = Iterate.collect(this.lineItems, LineItem::getValue);

        return CollectionAdapter.adapt(itemValues).injectInto(0.0, AddFunction.DOUBLE_TO_DOUBLE);
    }
}


================================================
FILE: src/main/java/com/gs/collections/kata/Supplier.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.block.function.Function;

/**
 * Suppliers have a name and an array of itemNames. Suppliers don't like lists - they prefer arrays....
 */
public class Supplier
{
    public static final Function<Supplier, String> TO_NAME = Supplier::getName;

    public static final Function<Supplier, Integer> TO_NUMBER_OF_ITEMS = supplier -> supplier.getItemNames().length;

    private final String name;
    private final String[] itemNames;

    public Supplier(String name, String[] itemNames)
    {
        this.name = name;
        this.itemNames = itemNames;
    }

    public String getName()
    {
        return this.name;
    }

    public String[] getItemNames()
    {
        return this.itemNames;
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/CompanyDomainForKata.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import org.junit.Before;

public abstract class CompanyDomainForKata
{
    protected final Company company = new Company("Bloggs Shed Supplies");

    @Before
    public void setUp()
    {
        Order.resetNextOrderNumber();
        this.setUpCustomersAndOrders();
        this.setUpSuppliers();
    }

    private void setUpSuppliers()
    {
        this.company.addSupplier(new Supplier("Shedtastic", new String[]{"shed", "big shed", "huge shed"}));
        this.company.addSupplier(new Supplier("Splendid Crocks", new String[]{"cup", "saucer", "bowl"}));
        this.company.addSupplier(new Supplier("Annoying Pets", new String[]{"dog", "cat", "goldfish"}));
        this.company.addSupplier(new Supplier("Gnomes 'R' Us", new String[]{"gnome"}));
        this.company.addSupplier(new Supplier("Furniture Hamlet", new String[]{"table", "sofa", "chair"}));
        this.company.addSupplier(new Supplier("SFD", new String[]{"sofa", "chair"}));
        this.company.addSupplier(new Supplier("Doxins", new String[]{"kettle", "plasma screen", "sandwich toaster"}));
    }

    private void setUpCustomersAndOrders()
    {
        Order fredOrder = new Order();
        fredOrder.addLineItem(new LineItem("shed", 50.0));

        /**
         * TODO 7: Refactor Order and its API so this repetition is not necessary.
         */
        // TODO 7: Add 3 cups at 1.5 each to the order
        fredOrder.addLineItem(new LineItem("cup", 1.5));
        fredOrder.addLineItem(new LineItem("cup", 1.5));
        fredOrder.addLineItem(new LineItem("cup", 1.5));

        // TODO 7: Add 3 saucers at 1.0 each to the order
        fredOrder.addLineItem(new LineItem("saucer", 1.0));
        fredOrder.addLineItem(new LineItem("saucer", 1.0));
        fredOrder.addLineItem(new LineItem("saucer", 1.0));

        fredOrder.addLineItem(new LineItem("chair", 12.50));
        fredOrder.addLineItem(new LineItem("table", 1.0));

        Customer fred = new Customer("Fred", "London");
        fred.addOrder(fredOrder);
        this.company.addCustomer(fred);

        Order maryOrder = new Order();
        maryOrder.addLineItem(new LineItem("cat", 150.0));
        maryOrder.addLineItem(new LineItem("big shed", 500.0));

        // TODO 7: Add 4 cups at 1.50 each to the order
        maryOrder.addLineItem(new LineItem("cup", 1.5));
        maryOrder.addLineItem(new LineItem("cup", 1.5));
        maryOrder.addLineItem(new LineItem("cup", 1.5));
        maryOrder.addLineItem(new LineItem("cup", 1.5));

        // TODO 7: Add 4 saucers at 1.50 each to the order
        maryOrder.addLineItem(new LineItem("saucer", 1.5));
        maryOrder.addLineItem(new LineItem("saucer", 1.5));
        maryOrder.addLineItem(new LineItem("saucer", 1.5));
        maryOrder.addLineItem(new LineItem("saucer", 1.5));

        maryOrder.addLineItem(new LineItem("sofa", 120.0));
        maryOrder.addLineItem(new LineItem("dog", 75.0));

        Customer mary = new Customer("Mary", "Liphook");
        mary.addOrder(maryOrder);
        this.company.addCustomer(mary);

        Order billOrder1 = new Order();
        billOrder1.addLineItem(new LineItem("shed", 50.0));

        // TODO 7: Add 43 gnomes at 7.50 each to the order
        for (int i = 0; i < 43; i++)
        {
            billOrder1.addLineItem(new LineItem("gnome", 7.50));
        }

        Order billOrder2 = new Order();
        billOrder2.addLineItem(new LineItem("bowl", 1.25));
        billOrder2.addLineItem(new LineItem("goldfish", 0.50));

        Order billOrder3 = new Order();
        billOrder3.addLineItem(new LineItem("table", 1.0));

        Customer bill = new Customer("Bill", "London");
        bill.addOrder(billOrder1);
        bill.addOrder(billOrder2);
        bill.addOrder(billOrder3);

        this.company.addCustomer(bill);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise1Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise1Test extends CompanyDomainForKata
{
    @Test
    public void getCustomerNames()
    {
        Function<Customer, String> nameFunction = Customer::getName;

        /**
         * Get the name of each of the company's customers.
         */
        MutableList<Customer> customers = this.company.getCustomers();
        MutableList<String> customerNames = null;

        MutableList<String> expectedNames = FastList.newListWith("Fred", "Mary", "Bill");
        Assert.assertEquals(expectedNames, customerNames);
    }

    @Test
    public void getCustomerCities()
    {
        /**
         * Get the city for each of the company's customers.
         */
        MutableList<Customer> customers = this.company.getCustomers();
        MutableList<String> customerCities = null;

        MutableList<String> expectedCities = FastList.newListWith("London", "Liphook", "London");
        Assert.assertEquals(expectedCities, customerCities);
    }

    @Test
    public void getLondonCustomers()
    {
        /**
         * Which customers come from London? Get a collection of those which do.
         */
        MutableList<Customer> customers = this.company.getCustomers();
        MutableList<Customer> customersFromLondon = null;
        Verify.assertSize("Should be 2 London customers", 2, customersFromLondon);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise2Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise2Test extends CompanyDomainForKata
{
    /**
     * Set up a {@link Predicate} that tests to see if a {@link Customer}'s city is "London"
     */
    private static final Predicate<Customer> CUSTOMER_FROM_LONDON = null;

    @Test
    public void customerFromLondonPredicate()
    {
        String predicateClass = CUSTOMER_FROM_LONDON.getClass().getSimpleName();
        Assert.assertTrue(
                "Solution should use Predicates.attributeEquals() or a lambda but used " + predicateClass,
                "AttributePredicate".equals(predicateClass) || predicateClass.startsWith("Exercise2Test$$Lambda"));

        Customer customerFromLondon = new Customer("test customer", "London");

        Assert.assertEquals(
                "Implement Customer.TO_CITY",
                "London",
                Customer.TO_CITY.valueOf(customerFromLondon));

        Assert.assertTrue(
                "CUSTOMER_FROM_LONDON should accept Customers where city is London",
                CUSTOMER_FROM_LONDON.accept(customerFromLondon));
    }

    /**
     * Do any customers come from London? Use the Predicate {@link #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void doAnyCustomersLiveInLondon()
    {
        boolean anyCustomersFromLondon = false;
        Assert.assertTrue(anyCustomersFromLondon);
    }

    /**
     * Do all customers come from London? Use the Predicate {@link #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void doAllCustomersLiveInLondon()
    {
        boolean allCustomersFromLondon = true;
        Assert.assertFalse(allCustomersFromLondon);
    }

    /**
     * How many customers come from London? Use the Predicate {@link #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void howManyCustomersLiveInLondon()
    {
        int numberOfCustomerFromLondon = 0;
        Assert.assertEquals("Should be 2 London customers", 2, numberOfCustomerFromLondon);
    }

    /**
     * Which customers come from London? Get a collection of those which do. Use the Predicate {@link
     * #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void getLondonCustomers()
    {
        MutableList<Customer> customersFromLondon = null;
        Verify.assertSize("Should be 2 London customers", 2, customersFromLondon);
    }

    /**
     * Which customers do not come from London? Get a collection of those which don't. Use the Predicate {@link
     * #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void getCustomersWhoDontLiveInLondon()
    {
        MutableList<Customer> customersNotFromLondon = null;
        Verify.assertSize("customers not from London", 1, customersNotFromLondon);
    }

    /**
     * Which customers come from London? Which customers do not come from London? Get a collection of each in a single pass.
     * Use the Predicate {@link #CUSTOMER_FROM_LONDON}.
     */
    @Test
    public void getCustomersWhoDoAndDoNotLiveInLondon()
    {
        MutableList<Customer> customersFromLondon = null;
        MutableList<Customer> customersNotFromLondon = null;
        Verify.assertSize("Should be 2 London customers", 2, customersFromLondon);
        Verify.assertSize("customers not from London", 1, customersNotFromLondon);
    }

    /**
     * Implement {@link Company#getCustomerNamed(String)} and get this test to pass.
     */
    @Test
    public void findMary()
    {
        Customer mary = this.company.getCustomerNamed("Mary");
        Assert.assertEquals("customer's name should be Mary", "Mary", mary.getName());
    }

    /**
     * Implement {@link Company#getCustomerNamed(String)} and get this test to pass.
     */
    @Test
    public void findPete()
    {
        Customer pete = this.company.getCustomerNamed("Pete");
        Assert.assertNull(
                "Should be null as there is no customer called Pete",
                pete);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise3Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.set.mutable.UnifiedSet;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise3Test extends CompanyDomainForKata
{
    /**
     * Improve {@link Company#getOrders()} without breaking this test.
     */
    @Test
    public void improveGetOrders()
    {
        // Delete this line - it's a reminder
        Assert.fail("Improve getOrders() without breaking this test");
        Verify.assertSize(5, this.company.getOrders());
    }

    /**
     * Get all items that have been ordered by anybody.
     */
    @Test
    public void findItemNames()
    {
        MutableList<LineItem> allOrderedLineItems = null;
        MutableSet<String> actualItemNames = null;

        Verify.assertInstanceOf(MutableSet.class, actualItemNames);
        Verify.assertInstanceOf(String.class, actualItemNames.getFirst());

        MutableSet<String> expectedItemNames = UnifiedSet.newSetWith(
                "shed", "big shed", "bowl", "cat", "cup", "chair", "dog",
                "goldfish", "gnome", "saucer", "sofa", "table");
        Assert.assertEquals(expectedItemNames, actualItemNames);
    }

    @Test
    public void findCustomerNames()
    {
        MutableList<String> names = null;

        MutableList<String> expectedNames = FastList.newListWith("Fred", "Mary", "Bill");
        Assert.assertEquals(expectedNames, names);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise4Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.List;

import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.utility.ArrayIterate;
import com.gs.collections.impl.utility.Iterate;
import org.junit.Assert;
import org.junit.Test;

public class Exercise4Test extends CompanyDomainForKata
{
    /**
     * Solve this without changing the return type of {@link Company#getSuppliers()}. Find the appropriate method on
     * {@link ArrayIterate}.
     */
    @Test
    public void findSupplierNames()
    {
        MutableList<String> supplierNames = null;

        MutableList<String> expectedSupplierNames = FastList.newListWith(
                "Shedtastic",
                "Splendid Crocks",
                "Annoying Pets",
                "Gnomes 'R' Us",
                "Furniture Hamlet",
                "SFD",
                "Doxins");
        Assert.assertEquals(expectedSupplierNames, supplierNames);
    }

    /**
     * Create a {@link Predicate} for Suppliers that supply more than 2 items. Find the number of suppliers that
     * satisfy that Predicate.
     */
    @Test
    public void countSuppliersWithMoreThanTwoItems()
    {
        Predicate<Supplier> moreThanTwoItems = null;
        int suppliersWithMoreThanTwoItems = 0;
        Assert.assertEquals("suppliers with more than 2 items", 5, suppliersWithMoreThanTwoItems);
    }

    /**
     * Try to solve this without changing the return type of {@link Supplier#getItemNames()}.
     */
    @Test
    public void whoSuppliesSandwichToaster()
    {
        // Create a Predicate that will check to see if a Supplier supplies a "sandwich toaster".
        Predicate<Supplier> suppliesToaster = null;

        // Find one supplier that supplies toasters.
        Supplier toasterSupplier = null;
        Assert.assertNotNull("toaster supplier", toasterSupplier);
        Assert.assertEquals("Doxins", toasterSupplier.getName());
    }

    @Test
    public void filterOrderValues()
    {
        List<Order> orders = this.company.getMostRecentCustomer().getOrders();
        /**
         * Get the order values that are greater than 1.5.
         */
        MutableList<Double> orderValues = null;
        MutableList<Double> filtered = null;
        Assert.assertEquals(FastList.newListWith(372.5, 1.75), filtered);
    }

    @Test
    public void filterOrders()
    {
        List<Order> orders = this.company.getMostRecentCustomer().getOrders();
        /**
         * Get the actual orders (not their double values) where those orders have a value greater than 2.0.
         */
        MutableList<Order> filtered = null;
        Assert.assertEquals(FastList.newListWith(Iterate.getFirst(this.company.getMostRecentCustomer().getOrders())), filtered);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise5Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.List;

import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.test.Verify;
import com.gs.collections.impl.utility.Iterate;
import org.junit.Assert;
import org.junit.Test;

public class Exercise5Test extends CompanyDomainForKata
{
    @Test
    public void filterOrderValues()
    {
        List<Order> orders = this.company.getMostRecentCustomer().getOrders();
        /**
         * Same exercise but don't use static utility - refactor the type of orders and {@link Customer#getOrders()}
         * instead.
         * Get the order values that are greater than 1.5.
         */
        MutableList<Double> orderValues = null;
        MutableList<Double> filtered = orderValues.select(Predicates.greaterThan(1.5));
        Assert.assertEquals(FastList.newListWith(372.5, 1.75), filtered);
        Verify.assertInstanceOf(MutableList.class, this.company.getMostRecentCustomer().getOrders());
        this.company.getMostRecentCustomer().getOrders().add(null);
        Verify.assertContains("Don't return a copy from Customer.getOrders(). The field should be a MutableList.", null, this.company.getMostRecentCustomer().getOrders());
    }

    @Test
    public void filterOrders()
    {
        List<Order> orders = this.company.getMostRecentCustomer().getOrders();
        /**
         * Same exercise but don't use static utility - refactor the type of orders and {@link Customer#getOrders()}
         * instead.
         * Get the actual orders (not their double values) where those orders have a value greater than 2.0.
         */
        MutableList<Order> filtered = null;
        Assert.assertEquals(FastList.newListWith(Iterate.getFirst(this.company.getMostRecentCustomer().getOrders())), filtered);
        Verify.assertInstanceOf(MutableList.class, this.company.getMostRecentCustomer().getOrders());
        this.company.getMostRecentCustomer().getOrders().add(null);
        Verify.assertContains("Don't return a copy from Customer.getOrders(). The field should be a MutableList.", null, this.company.getMostRecentCustomer().getOrders());
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise6Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import com.gs.collections.api.RichIterable;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.impl.block.factory.Procedures;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise6Test extends CompanyDomainForKata
{
    /**
     * Get a list of the customers' total order values, sorted. Check out the implementation of {@link
     * Customer#getTotalOrderValue()} and {@link Order#getValue()} .
     */
    @Test
    public void sortedTotalOrderValue()
    {
        MutableList<Double> sortedTotalValues = null;

        // Don't forget the handy utility methods getFirst() and getLast()...
        Assert.assertEquals("Highest total order value", Double.valueOf(857.0), sortedTotalValues.getLast());
        Assert.assertEquals("Lowest total order value", Double.valueOf(71.0), sortedTotalValues.getFirst());
    }

    /**
     * Find the max total order value across all customers.
     */
    @Test
    public void maximumTotalOrderValue()
    {
        Double maximumTotalOrderValue = null;
        Assert.assertEquals("max value", Double.valueOf(857.0), maximumTotalOrderValue);
    }

    /**
     * Find the customer with the highest total order value.
     */
    @Test
    public void customerWithMaxTotalOrderValue()
    {
        Customer customerWithMaxTotalOrderValue = null;
        Assert.assertEquals(this.company.getCustomerNamed("Mary"), customerWithMaxTotalOrderValue);
    }

    /**
     * Create some code to get the company's supplier names as a tilde delimited string.
     */
    @Test
    public void supplierNamesAsTildeDelimitedString()
    {
        String tildeSeparatedNames = null;
        Assert.assertEquals(
                "tilde separated names",
                "Shedtastic~Splendid Crocks~Annoying Pets~Gnomes 'R' Us~Furniture Hamlet~SFD~Doxins",
                tildeSeparatedNames);
    }

    /**
     * Deliver all orders going to customers from London.
     * <p>
     * Hint: Use {@link RichIterable#forEach(Procedure)}. To solve the ambiguity error, use {@link Procedures#cast(Procedure)}}.
     *
     * @see Order#deliver()
     */
    @Test
    public void deliverOrdersToLondon()
    {
        Verify.assertAllSatisfy(this.company.getCustomerNamed("Fred").getOrders(), Order::isDelivered);
        Verify.assertNoneSatisfy(this.company.getCustomerNamed("Mary").getOrders(), Order::isDelivered);
        Verify.assertAllSatisfy(this.company.getCustomerNamed("Bill").getOrders(), Order::isDelivered);
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise7Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.List;

import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.list.MutableListMultimap;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise7Test extends CompanyDomainForKata
{
    /**
     * Create a multimap where the keys are the names of cities and the values are the customers from those cities.
     */
    @Test
    public void customersByCity()
    {
        // Notice that the second generic type is Customer, not List<Customer>
        MutableListMultimap<String, Customer> multimap = null;

        Assert.assertEquals(FastList.newListWith(this.company.getCustomerNamed("Mary")), multimap.get("Liphook"));
        Assert.assertEquals(
                FastList.newListWith(
                        this.company.getCustomerNamed("Fred"),
                        this.company.getCustomerNamed("Bill")),
                multimap.get("London"));
    }

    @Test
    public void mapOfItemsToSuppliers()
    {
        Assert.fail("Refactor this as part of Exercise 7");
        /**
         * Change itemsToSuppliers to a MutableMultimap<String, Supplier>
         */
        final MutableMap<String, List<Supplier>> itemsToSuppliers = UnifiedMap.newMap();

        for (Supplier supplier : this.company.getSuppliers())
        {
            for (String itemName : supplier.getItemNames())
            {
                List<Supplier> suppliersForItem;
                if (itemsToSuppliers.containsKey(itemName))
                {
                    suppliersForItem = itemsToSuppliers.get(itemName);
                }
                else
                {
                    suppliersForItem = FastList.newList();
                    itemsToSuppliers.put(itemName, suppliersForItem);
                }

                suppliersForItem.add(supplier);
            }
        }
        Verify.assertIterableSize("should be 2 suppliers for sofa", 2, itemsToSuppliers.get("sofa"));
    }

    @Test
    public void reminder()
    {
        Assert.fail("Refactor setUpCustomersAndOrders() in the super class to not have so much repetition.");
        // Delete this whole method when you're done. It's just a reminder.
    }
}


================================================
FILE: src/test/java/com/gs/collections/kata/Exercise8Test.java
================================================
/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.kata;

import java.util.Collections;

import com.gs.collections.api.RichIterable;
import com.gs.collections.api.bag.sorted.MutableSortedBag;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function0;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.list.MutableListMultimap;
import com.gs.collections.impl.bag.sorted.mutable.TreeBag;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.test.Verify;
import org.junit.Assert;
import org.junit.Test;

public class Exercise8Test extends CompanyDomainForKata
{
    /**
     * Extra credit. Aggregate the total order values by city.
     *
     * @see RichIterable#aggregateBy(Function, Function0, Function2)
     */
    @Test
    public void totalOrderValuesByCity()
    {
        Function0<Double> zeroValueFactory = () -> 0.0;
        Function2<Double, Customer, Double> aggregator = (result, customer) -> result + customer.getTotalOrderValue();

        MutableMap<String, Double> map = null;
        Assert.assertEquals(2, map.size());
        Assert.assertEquals(446.25, map.get("London"), 0.0);
        Assert.assertEquals(857.0, map.get("Liphook"), 0.0);
    }

    /**
     * Extra credit. Aggregate the total order values by item.
     * Hint: Look at {@link RichIterable#aggregateBy(Function, Function0, Function2)} and remember
     * how to use {@link RichIterable#flatCollect(Function)} to get an iterable of all items.
     */
    @Test
    public void totalOrderValuesByItem()
    {
        Function0<Double> zeroValueFactory = () -> 0.0;
        Function2<Double, LineItem, Double> aggregator = (result, lineItem) -> result + lineItem.getValue();

        MutableMap<String, Double> map = null;
        Verify.assertSize(12, map);
        Assert.assertEquals(100.0, map.get("shed"), 0.0);
        Assert.assertEquals(10.5, map.get("cup"), 0.0);
    }

    /**
     * Extra credit. Find all customers' line item values greater than 7.5 and sort them by highest to lowest price.
     */
    @Test
    public void sortedOrders()
    {
        MutableSortedBag<Double> orderedPrices = null;

        MutableSortedBag<Double> expectedPrices = TreeBag.newBagWith(
                Collections.reverseOrder(), 500.0, 150.0, 120.0, 75.0, 50.0, 50.0, 12.5);
        Verify.assertSortedBagsEqual(expectedPrices, orderedPrices);
    }

    /**
     * Extra credit. Figure out which customers ordered saucers (in any of their orders).
     */
    @Test
    public void whoOrderedSaucers()
    {
        MutableList<Customer> customersWithSaucers = null;
        Verify.assertSize("customers with saucers", 2, customersWithSaucers);
    }

    /**
     * Extra credit. Look into the {@link MutableList#toMap(Function, Function)} method.
     */
    @Test
    public void ordersByCustomerUsingAsMap()
    {
        MutableMap<String, MutableList<Order>> customerNameToOrders =
                this.company.getCustomers().toMap(null, null);

        Assert.assertNotNull("customer name to orders", customerNameToOrders);
        Verify.assertSize("customer names", 3, customerNameToOrders);
        MutableList<Order> ordersForBill = customerNameToOrders.get("Bill");
        Verify.assertSize("Bill orders", 3, ordersForBill);
    }

    /**
     * Extra credit. Create a multimap where the values are customers and the key is the price of
     * the most expensive item that the customer ordered.
     */
    @Test
    public void mostExpensiveItem()
    {
        MutableListMultimap<Double, Customer> multimap = null;
        Assert.assertEquals(3, multimap.size());
        Assert.assertEquals(2, multimap.keysView().size());
        Assert.assertEquals(
                FastList.newListWith(
                        this.company.getCustomerNamed("Fred"),
                        this.company.getCustomerNamed("Bill")),
                multimap.get(50.0));
    }
}