2021-08-02

mockito/README.md

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+# Mockito
+
+## mock()
+
+## when()

mockito/build.gradle.kts

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+plugins {
+    id("elex-java")
+}
+
+dependencies {
+    // https://mvnrepository.com/artifact/org.mockito/mockito-core
+    testImplementation("org.mockito:mockito-core:3.11.2")
+}

mockito/src/main/java/kr/pe/elex/examples/Person.java

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+package kr.pe.elex.examples;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class Person {
+	private String name;
+	private int age;
+	private String email;
+}

mockito/src/main/java/kr/pe/elex/examples/package-info.java

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+package kr.pe.elex.examples;

mockito/src/test/java/kr/pe/elex/examples/MockTest.java

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+package kr.pe.elex.examples;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.*;
+
+public class MockTest {
+	@Test
+	void mock() {
+		Person jane = Mockito.mock(Person.class);
+		jane.setName("Jane");
+
+		assertNull(jane.getName());
+	}
+
+	@Test
+	void mock2() {
+		Person jane = Mockito.mock(Person.class);
+		when(jane.getName()).thenReturn("Jane");
+		when(jane.getAge()).thenReturn(22);
+
+		assertEquals("Jane", jane.getName());
+	}
+
+	@Test
+	void mock3() {
+		ArrayList list = Mockito.mock(ArrayList.class);
+
+		when(list.get(anyInt())).thenReturn("Apple");
+
+		assertEquals("Apple", list.get(10));
+	}
+
+	@Test
+	void mock4() {
+		Person jane = Mockito.mock(Person.class);
+		when(jane.getName()).thenReturn("Jane");
+		when(jane.getAge()).thenReturn(22);
+
+		assertEquals("Jane", jane.getName());
+		assertEquals(22, jane.getAge());
+
+		verify(jane, times(1)).getAge();
+
+	}
+
+	@Test
+	void spy1() {
+		Person jane = Mockito.spy(new Person("Jane",22,"jane@example.com"));
+		when(jane.getName()).thenReturn("JANE");
+
+		assertEquals("JANE", jane.getName());
+		assertEquals(22, jane.getAge());
+
+	}
+}

mockito/src/test/java/kr/pe/elex/examples/PersonListTest.java

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+package kr.pe.elex.examples;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.*;
+
+class PersonListTest {
+
+	private static List<Person> persons;
+
+	@BeforeAll
+	static void beforeEach() {
+		persons = Mockito.mock(List.class);
+		persons.add(new Person("Charlie",11, "charlie@example.com"));
+		persons.add(new Person("Steve",34, "steve@example.com"));
+		persons.add(new Person("Jane",22, "jane@example.com"));
+	}
+
+	@Test
+	void test() {
+		System.out.println(persons.get(0));
+
+		verify(persons).get(0);
+	}
+}

mockito/src/test/java/kr/pe/elex/examples/PersonTest.java

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+package kr.pe.elex.examples;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doThrow;
+import static org.mockito.Mockito.when;
+
+class PersonTest {
+
+	private Person charlie, steve;
+
+	@BeforeEach
+	void beforeEach() {
+		charlie = Mockito.mock(Person.class);
+		when(charlie.getName()).thenReturn("Charlie");
+		when(charlie.getAge()).thenReturn(11);
+
+		doThrow(new IllegalArgumentException())
+				.when(charlie).setName(eq("Brown"));
+
+		steve = Mockito.spy(new Person("Steve",34,"steve@example.com"));
+		when(steve.getName()).thenReturn("STEVE");
+	}
+
+	@Test
+	void test1() {
+		assertEquals("Charlie", charlie.getName());
+		assertEquals(11, charlie.getAge());
+	}
+
+	@Test
+	void test2() {
+		assertThrows(IllegalArgumentException.class,
+				() -> charlie.setName("Brown"));
+	}
+
+	@Test
+	void test3() {
+		assertEquals("STEVE", steve.getName());
+		assertEquals(34, steve.getAge());
+	}
+}