[osj] test: 숫자야구게임 - 0. 학습 테스트 실습 작성

src/test/java/study/SetTest.java

@@ -0,0 +1,48 @@
+package study;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class SetTest {
+    private Set<Integer> numbers;
+
+    @BeforeEach
+    void setUp() {
+        numbers = new HashSet<>();
+        numbers.add(1);
+        numbers.add(1);
+        numbers.add(2);
+        numbers.add(3);
+    }
+
+    //Test Case 구현
+
+    @DisplayName("Set size() 테스트")
+    @Test
+    void size() {
+        assertThat(numbers.size()).isEqualTo(3);
+    }
+
+    @DisplayName("Set contains() 테스트")
+    @ParameterizedTest
+    @ValueSource(ints = {1, 2, 3})
+    void contains(int number) {
+        assertThat(numbers.contains(number)).isTrue();
+    }
+
+    @DisplayName("Set contains() 참거짓 테스트")
+    @ParameterizedTest
+    @CsvSource(value = {"1:true", "2:true", "3:true", "4:false", "5:false"}, delimiter = ':')
+    void contains2(int number, boolean expected) {
+        assertThat(numbers.contains(number)).isEqualTo(expected);
+    }
+}

src/test/java/study/StringTest.java

@@ -1,13 +1,59 @@
 package study;
 
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
-import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.*;
 
 public class StringTest {
+    @DisplayName("문자열 일치 테스트")
     @Test
     void replace() {
-        String actual = "abc".replace("b", "d");
-        assertThat(actual).isEqualTo("adc");
+        String actual = "abc".replace("b", "d"); //실행 단계
+        assertThat(actual).isEqualTo("adc"); //검증 단계
+    }
+
+    @DisplayName("문자열 split() 테스트")
+    @Test
+    void split() {
+        //given
+        String str1 = "1,2";
+        String str2 = "1";
+
+        //when
+        String[] actual1 = str1.split(",");
+        String[] actual2 = str2.split(",");
+
+        //then
+        assertThat(actual1).containsExactly("1", "2");
+        assertThat(actual2).containsExactly("1");
+    }
+
+    @DisplayName("문자열 substring() 테스트")
+    @Test
+    void substring() {
+        //given
+        String str = "(1,2)";
+
+        //when
+        String actual = str.substring(1, str.length() - 1);
+
+        //then
+        assertThat(actual).isEqualTo("1,2");
+    }
+
+    @DisplayName("문자열 charAt() 테스트")
+    @Test
+    void charAt() {
+        //given
+        String str = "abc";
+
+        //when
+        Throwable thrown = catchThrowable(() -> str.charAt(3));
+
+        //then
+        assertThat(thrown)
+                .isInstanceOf(StringIndexOutOfBoundsException.class)
+                .hasMessageContaining("String index out of range: 3");
     }
 }