Initial Commit

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="jUnitPractice" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
\ No newline at end of file

.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

jUnitPractice.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />
\ No newline at end of file

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.nisum.banderson</groupId>
+    <artifactId>jUnitPractice</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.7.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>5.7.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>5.7.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>
\ No newline at end of file

src/main/java/Book.java

+import java.util.Objects;
+
+public class Book {
+    private String title;
+    private String author;
+
+    public Book(String title, String author) {
+        this.title = title;
+        this.author = author;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public Book setTitle(String title) {
+        this.title = title;
+        return this;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public Book setAuthor(String author) {
+        this.author = author;
+        return this;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Book)) return false;
+        Book book = (Book) o;
+        return Objects.equals(getTitle(), book.getTitle()) && Objects.equals(getAuthor(), book.getAuthor());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(getTitle(), getAuthor());
+    }
+}

src/main/java/Library.java

+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class Library {
+    private Map<Book, Integer> booksInStock;
+
+    public Library() {
+        booksInStock = new HashMap<>();
+    }
+
+    public List<Book> findBooksByTitle(String title) {
+        return booksInStock.keySet().stream()
+                .filter(book -> book.getTitle().equals(title))
+                .collect(Collectors.toList());
+    }
+
+    public List<Book> findBooksByAuthor(String author) {
+        return booksInStock.keySet().stream()
+                .filter(book -> book.getAuthor().equals(author))
+                .collect(Collectors.toList());
+    }
+
+    public boolean isBookAvailable(Book book) {
+        Integer quantity = booksInStock.get(book);
+        return quantity != null && quantity != 0;
+    }
+
+    public Book checkBookOut(Book book) {
+        if (!isBookAvailable(book)) {
+            return null;
+        }
+
+        booksInStock.put(book, booksInStock.get(book) - 1);
+        return book;
+    }
+
+    public void returnBook(Book book) throws Exception {
+        if (!booksInStock.containsKey(book)) {
+            throw new Exception("That book does not exist in our records!");
+        }
+
+        booksInStock.put(book, booksInStock.get(book) + 1);
+    }
+
+    public void buyBooks(Book... books) {
+        for (Book book : books) {
+            if (booksInStock.containsKey(book)) {
+                booksInStock.put(book, booksInStock.get(book) + 1);
+            } else {
+                booksInStock.put(book, 1);
+            }
+        }
+    }
+
+}

src/test/java/LibraryTest.java

+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.Arrays;
+import java.util.List;
+
+class LibraryTest {
+    static Library library;
+
+//    @BeforeAll
+//    static void setUp() {
+//        library = new Library();
+//    }
+
+    @BeforeEach
+    void setBooks() {
+        library = new Library();
+        library.buyBooks(new Book(
+                "The Lion, The Witch, & The Wardrobe",
+                "C.S. Lewis"
+                ), new Book(
+                  "The Magician's Apprentice",
+                "C.S. Lewis"
+                ), new Book(
+                        "The Magician's Apprentice",
+                        "C.S. Lewis"
+                ), new Book(
+                        "The Magician's Apprentice",
+                        "C.S. Lewis"
+                ), new Book(
+                        "The Lord of The Rings",
+                        "J.R.R. Tolkien"
+                ), new Book(
+                        "The Lord of The Rings",
+                        "J.R.R. Tolkien"
+                )
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource
+    void findBooksByTitle(String title, Integer resultLength) {
+        List<Book> foundBooks = library.findBooksByTitle(title);
+        Assertions.assertEquals(resultLength, foundBooks.size());
+    }
+
+    private static List<Arguments> findBooksByTitle() {
+        return Arrays.asList(
+                Arguments.of("The Lord of The Rings", 2),
+                Arguments.of("The Lord of The Flies", 0)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource
+    void findBooksByAuthor(String author, Integer resultLength) {
+        List<Book> foundBooks = library.findBooksByAuthor(author);
+        Assertions.assertEquals(resultLength, foundBooks.size());
+    }
+
+    private static List<Arguments> findBooksByAuthor() {
+        return Arrays.asList(
+                Arguments.of("C.S. Lewis", 4),
+                Arguments.of("J.K. Rowling", 0)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource
+    void isBookAvailable(Book book, Boolean expected) {
+        Boolean actual = library.isBookAvailable(book);
+        Assertions.assertTrue(expected == actual);
+    }
+
+    private static List<Arguments> isBookAvailable() {
+        return Arrays.asList(
+                Arguments.of(new Book(
+                        "The Magician's Apprentice",
+                        "C.S. Lewis"
+                ), true),
+                Arguments.of(new Book(
+                        "Harry Potter and the Phoenix",
+                        "J.K. Rowling"
+                ), false)
+        );
+    }
+
+    @Test
+    void checkBookOut() {
+        Book book1 = new Book(
+                "Harry Potter and the Phoenix",
+                "J.K. Rowling"
+        );
+        Assertions.assertNull(library.checkBookOut(book1));
+    }
+
+    @Test
+    void returnBookWithError() {
+        Assertions.assertThrows(
+                Exception.class,
+                () -> library.returnBook(new Book("", ""))
+        );
+    }
+
+}
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