0단계 - JUnit 5 학습

src/test/java/racingcar/Car.java

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+package racingcar;
+
+import java.util.Random;
+
+public class Car {
+
+    private String carName;
+
+    public Car(String carName) {
+        if (carName == null) {
+            return;
+        }
+
+        if (carName.length() > 5) {
+            throw new IllegalArgumentException();
+        }
+
+        this.carName = carName;
+    }
+
+    public boolean movable(int num) {
+        return num >= 4;
+    }
+
+    public boolean movable() {
+        Random random = new Random();
+        var num = random.nextInt(10);
+        return movable(num);
+    }
+}

src/test/java/racingcar/CarTest.java

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+package racingcar;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+public class CarTest {
+
+    @Test
+    @DisplayName("자동차 이름은 5글자를 넘을 수 없다.")
+    void throwsExceptionWhenCreateCar() {
+        assertThatThrownBy(() -> {
+            Car car = new Car("가나다라마바");
+        }).isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    @DisplayName("자동차는 무작위 값이 4이상인 경우 움직인다.")
+    void moving() {
+        Car car = new Car("가나다라마");
+        assertThat(car.movable(4)).isTrue();
+        assertThat(car.movable(3)).isFalse();
+    }
+}