SpringBoot 之 单元测试

<dependency>
    <groupId>org.junit.vintage</groupId>
    <artifactId>junit-vintage-engine</artifactId>
    <scope>test</scope>
    <exclusions>
        <exclusion>
            <groupId>org.hamcrest</groupId>
            <artifactId>hamcrest-core</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-test</artifactId>
  <scope>test</scope>
</dependency>

@Test
@DisplayName("simple assertion")
public void simple() {
     assertEquals(3, 1 + 2, "simple math");
     assertNotEquals(3, 1 + 1);
     assertNotSame(new Object(), new Object());
     Object obj = new Object();
     assertSame(obj, obj);
     assertFalse(1 > 2);
     assertTrue(1 < 2);
     assertNull(null);
     assertNotNull(new Object());
}

@Test
@DisplayName("array assertion")
public void array() {
 assertArrayEquals(new int[]{1, 2}, new int[] {1, 2});
}

@Test
@DisplayName("assert all")
public void all() {
 assertAll("Math",
    () -> assertEquals(2, 1 + 1),
    () -> assertTrue(1 > 0)
 );
}

@Test
@DisplayName("异常测试")
public void exceptionTest() {
    ArithmeticException exception = Assertions.assertThrows(
       //扔出断言异常
       ArithmeticException.class, () -> System.out.println(1 % 0));
}

@Test
@DisplayName("超时测试")
public void timeoutTest() {
    //如果测试方法时间超过1s将会异常
    Assertions.assertTimeout(Duration.ofMillis(1000), () -> Thread.sleep(500));
}

@Test
@DisplayName("fail")
public void shouldFail() {
  fail("This should fail");
}

@DisplayName("前置条件")
public class AssumptionsTest {
    private final String environment = "DEV";
    @Test
  @DisplayName("simple")
  public void simpleAssume() {
      assumeTrue(Objects.equals(this.environment, "DEV"));
      assumeFalse(() -> Objects.equals(this.environment, "PROD"));
  }
  @Test
  @DisplayName("assume then do")
  public void assumeThenDo() {
      assumingThat(
         Objects.equals(this.environment, "DEV"),
         () -> System.out.println("In DEV")
      );
  }
}

@DisplayName("A stack")
class TestingAStackDemo {
    Stack<Object> stack;
    @Test
    @DisplayName("is instantiated with new Stack()")
    void isInstantiatedWithNew() {
        new Stack<>();
    }
    @Nested
    @DisplayName("when new")
    class WhenNew {
        @BeforeEach
        void createNewStack() {
            stack = new Stack<>();
        }
        @Test
        @DisplayName("is empty")
        void isEmpty() {
            assertTrue(stack.isEmpty());
        }
        @Test
        @DisplayName("throws EmptyStackException when popped")
        void throwsExceptionWhenPopped() {
            assertThrows(EmptyStackException.class, stack::pop);
        }
        @Test
        @DisplayName("throws EmptyStackException when peeked")
        void throwsExceptionWhenPeeked() {
            assertThrows(EmptyStackException.class, stack::peek);
        }
        @Nested
        @DisplayName("after pushing an element")
        class AfterPushing {
            String anElement = "an element";
            @BeforeEach
            void pushAnElement() {
                stack.push(anElement);
            }
            @Test
            @DisplayName("it is no longer empty")
            void isNotEmpty() {
                assertFalse(stack.isEmpty());
            }
            @Test
            @DisplayName("returns the element when popped and is empty")
            void returnElementWhenPopped() {
                assertEquals(anElement, stack.pop());
                assertTrue(stack.isEmpty());
            }
            @Test
            @DisplayName("returns the element when peeked but remains not empty")
            void returnElementWhenPeeked() {
                assertEquals(anElement, stack.peek());
                assertFalse(stack.isEmpty());
            }
        }
    }
}

@ParameterizedTest
@ValueSource(strings = {"one", "two", "three"})
@DisplayName("参数化测试1")
public void parameterizedTest1(String string) {
    System.out.println(string);
    Assertions.assertTrue(StringUtils.isNotBlank(string));
}
@ParameterizedTest
@MethodSource("method")    //指定方法名
@DisplayName("方法来源参数")
public void testWithExplicitLocalMethodSource(String name) {
    System.out.println(name);
    Assertions.assertNotNull(name);
}
static Stream<String> method() {
    return Stream.of("apple", "banana");
}