Step1

src/test/java/study/SetTest.java

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+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
+    @Test
+    @DisplayName("Set의 크기 확인")
+    void setSizeTest() {
+        assertThat(numbers.size()).isEqualTo(3);
+    }
+
+    @DisplayName("Set에 포함된 값 확인")
+    @ParameterizedTest
+    @ValueSource(ints = {1, 2, 3})
+    void containsTest(int number) {
+        assertThat(numbers.contains(number)).isTrue();
+    }
+
+    @DisplayName("Set에 포함되지 않은 값 확인")
+    @ParameterizedTest
+    @CsvSource(value = {"1:true", "2:true", "3:true", "4:false", "5:false"}, delimiter = ':')
+    void expectedValueTest(int number, boolean expected) {
+        assertThat(numbers.contains(number)).isEqualTo(expected);
+    }
+}

src/test/java/study/StringTest.java

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+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.assertThatThrownBy;
+
+public class StringTest {
+    @Test
+    @DisplayName("split 테스트")
+    void splitTest() {
+        String num = "1,2";
+        String[] splitExactlyStr = num.split(",");
+        assertThat(splitExactlyStr).containsExactly("1","2");
+    }
+
+    @Test
+    @DisplayName("substring 테스트")
+    void substringTest() {
+        String num = "(1,2)";
+        String substringStr = num.substring(1, 4);
+        assertThat(substringStr).isEqualTo("1,2");
+    }
+
+    @Test
+    @DisplayName("charAt 테스트")
+    void charAtTest() {
+        String charStr = "abc";
+        assertThat(charStr.charAt(1)).isEqualTo('b');
+    }
+
+    @Test
+    @DisplayName("charAt Exception 테스트")
+    void charAtExceptionTest() {
+        String charStr = "abc";
+        assertThatThrownBy(() -> {
+            charStr.charAt(4);
+        }).isInstanceOf(StringIndexOutOfBoundsException.class)
+                .hasMessageContaining("String index out of range: 4");
+    }
+}

src/test/java/study/study/SetTest.java

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+package study.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
+    @Test
+    @DisplayName("Set의 크기 확인")
+    void setSizeTest() {
+        assertThat(numbers.size()).isEqualTo(3);
+    }
+
+    @DisplayName("Set에 포함된 값 확인")
+    @ParameterizedTest
+    @ValueSource(ints = {1, 2, 3})
+    void containsTest(int number) {
+        assertThat(numbers.contains(number)).isTrue();
+    }
+
+    @DisplayName("Set에 포함되지 않은 값 확인")
+    @ParameterizedTest
+    @CsvSource(value = {"1:true", "2:true", "3:true", "4:false", "5:false"}, delimiter = ':')
+    void expectedValueTest(int number, boolean expected) {
+        assertThat(numbers.contains(number)).isEqualTo(expected);
+    }
+}

src/test/java/study/study/StringTest.java

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+package study.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.assertThatThrownBy;
+
+public class StringTest {
+    @Test
+    @DisplayName("split 테스트")
+    void splitTest() {
+        String num = "1,2";
+        String[] splitExactlyStr = num.split(",");
+        assertThat(splitExactlyStr).containsExactly("1","2");
+    }
+
+    @Test
+    @DisplayName("substring 테스트")
+    void substringTest() {
+        String num = "(1,2)";
+        String substringStr = num.substring(1, 4);
+        assertThat(substringStr).isEqualTo("1,2");
+    }
+
+    @Test
+    @DisplayName("charAt 테스트")
+    void charAtTest() {
+        String charStr = "abc";
+        assertThat(charStr.charAt(1)).isEqualTo('b');
+    }
+
+    @Test
+    @DisplayName("charAt Exception 테스트")
+    void charAtExceptionTest() {
+        String charStr = "abc";
+        assertThatThrownBy(() -> {
+            charStr.charAt(4);
+        }).isInstanceOf(StringIndexOutOfBoundsException.class)
+                .hasMessageContaining("String index out of range: 4");
+    }
+}