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TODO [Assertions](https://junit.org/junit5/docs/5.0.1/api/org/junit/jupiter/api/Assertions.html)

TODO [快速看一眼JUnit 5](https://www.ithome.com.tw/voice/117883)

TODO [JUnit 5 User Guide](https://junit.org/junit5/docs/current/user-guide/)

```java
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.mockito.Mockito.when;

@ExtendWith(MockitoExtension.class)
public class CalculatorServiceTest {
    @Mock
    private CalculatorService calculatorService;
    @InjectMocks
    private CalculatorController calculatorController;
    @Test
    public void testAddition() {
        // Arrange
        int a = 5;
        int b = 10;
        int expectedResult = 15;
        when(calculatorService.add(a, b)).thenReturn(expectedResult);
        // Act
        int result = calculatorController.add(a, b);
        // Assert
        assertThat(result, is(equalTo(expectedResult)));
    }
}
```

```java
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.endsWith;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.greaterThanOrEqualTo;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.lessThan;
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.startsWith;

public class HamcrestExamples {
    public static void main(String[] args) {
        // equalTo / is
        assertThat(10, Matchers.equalTo(10));
        assertThat(10, Matchers.is(10));
        // not
        assertThat(10, Matchers.not(Matchers.equalTo(20)));
        // nullValue / notNullValue
        assertThat(null, Matchers.nullValue());
        assertThat("Hello", Matchers.notNullValue());
        // containsString
        assertThat("Hello, World!", Matchers.containsString("World"));
        // startsWith
        assertThat("Hello, World!", Matchers.startsWith("Hello"));
        // endsWith
        assertThat("Hello, World!", Matchers.endsWith("!"));
        // greaterThan
        assertThat(15, Matchers.greaterThan(10));
        // lessThan
        assertThat(5, Matchers.lessThan(10));
        // greaterThanOrEqualTo
        assertThat(10, Matchers.greaterThanOrEqualTo(10));
        // lessThanOrEqualTo
        assertThat(5, Matchers.lessThanOrEqualTo(10));
    }
}
```

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