BAEL-809: Add Kotlin Mockito supporting code (#2102)

kotlin-mockito/README.md

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+## Relevant articles:
+
+- [Introduction to the Kotlin Language](http://www.baeldung.com/kotlin)
+- [A guide to the “when{}” block in Kotlin](http://www.baeldung.com/kotlin-when)
+- [Comprehensive Guide to Null Safety in Kotlin](http://www.baeldung.com/kotlin-null-safety)
+- [Kotlin Java Interoperability](http://www.baeldung.com/kotlin-java-interoperability)
+- [Difference Between “==” and “===” in Kotlin](http://www.baeldung.com/kotlin-equality-operators)
+- [Generics in Kotlin](http://www.baeldung.com/kotlin-generics)

kotlin-mockito/pom.xml

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+<?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>
+
+    <artifactId>kotlin-mockito</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-all</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+
+    <build>
+        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
+        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
+
+        <plugins>
+            <plugin>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/main/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
+                                <sourceDir>${project.basedir}/src/test/java</sourceDir>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler.version}</version>
+                <executions>
+                    <!-- Replacing default-compile as it is treated specially 
+                        by maven -->
+                    <execution>
+                        <id>default-compile</id>
+                        <phase>none</phase>
+                    </execution>
+                    <!-- Replacing default-testCompile as it is treated specially 
+                        by maven -->
+                    <execution>
+                        <id>default-testCompile</id>
+                        <phase>none</phase>
+                    </execution>
+                    <execution>
+                        <id>java-compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>java-test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>testCompile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <mockito.version>1.9.5</mockito.version>
+        <junit.version>4.12</junit.version>
+        <kotlin.version>1.1.2-4</kotlin.version>
+        <maven-compiler.version>3.5.1</maven-compiler.version>
+    </properties>
+
+</project>

kotlin-mockito/src/main/java/com/baeldung/java/ArrayExample.java

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+package com.baeldung.java;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class ArrayExample {
+
+    public int sumValues(int[] nums) {
+        int res = 0;
+
+        for (int x:nums) {
+            res += x;
+        }
+
+        return res;
+    }
+
+    public void writeList() throws IOException {
+        File file = new File("E://file.txt");
+        FileReader fr = new FileReader(file);
+        fr.close();
+    }
+}

kotlin-mockito/src/main/java/com/baeldung/java/Customer.java

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+package com.baeldung.java;
+
+public class Customer {
+
+    private String firstName;
+    private String lastName;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+}

kotlin-mockito/src/main/java/com/baeldung/java/StringUtils.java

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+package com.baeldung.java;
+
+public class StringUtils {
+    public static String toUpperCase(String name) {
+        return name.toUpperCase();
+    }
+}

kotlin-mockito/src/main/kotlin/com/baeldung/kotlin/BookService.kt

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+package com.baeldung.kotlin
+
+interface BookService {
+    fun inStock(bookId: Int): Boolean
+    fun lend(bookId: Int, memberId: Int)
+}

kotlin-mockito/src/main/kotlin/com/baeldung/kotlin/LendBookManager.kt

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+package com.baeldung.kotlin
+
+class LendBookManager(val bookService:BookService) {
+    fun checkout(bookId: Int, memberId: Int) {
+        if(bookService.inStock(bookId)) {
+            bookService.lend(bookId, memberId)
+        } else {
+            throw IllegalStateException("Book is not available")
+        }
+    }
+}

kotlin-mockito/src/test/java/com/baeldung/kotlin/JavaCallToKotlinUnitTest.java

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+package com.baeldung.kotlin;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class JavaCallToKotlinUnitTest {
+    @Test
+    public void givenKotlinClass_whenCallFromJava_shouldProduceResults() {
+        //when
+        int res = new MathematicsOperations().addTwoNumbers(2, 4);
+
+        //then
+        assertEquals(6, res);
+
+    }
+}

kotlin-mockito/src/test/kotlin/com/baeldung/kotlin/LendBookManagerTest.kt

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+package com.baeldung.kotlin;
+
+import org.junit.Assert
+import org.junit.Test
+import java.lang.IllegalStateException
+import org.mockito.InjectMocks
+import org.mockito.Mockito
+
+class LibraryManagementTest {
+    @Test(expected = IllegalStateException::class)
+    fun whenBookIsNotAvailable_thenAnExceptionIsThrown() {
+        val mockBookService = Mockito.mock(BookService::class.java)
+
+        Mockito.`when`(mockBookService.inStock(100)).thenReturn(false)
+
+        val manager = LendBookManager(mockBookService)
+
+        manager.checkout(100, 1)
+    }
+
+    @Test
+    fun whenBookIsAvailable_thenLendMethodIsCalled() {
+        val mockBookService = Mockito.mock(BookService::class.java)
+
+        Mockito.`when`(mockBookService.inStock(100)).thenReturn(true)
+
+        val manager = LendBookManager(mockBookService)
+
+        manager.checkout(100, 1)
+
+        Mockito.`verify`(mockBookService).lend(100, 1)
+    }
+}