학습 테스트 실습 추가 (#1843)

src/test/java/study/SetTest.java

@@ -0,0 +1,49 @@
+package study;
+
+import org.assertj.core.api.Assertions;
+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.*;
+
+@DisplayName("Set Collection에 대한 학습 테스트")
+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
+    @DisplayName("Set size 확인")
+    public void setTest01() throws Exception {
+        assertThat(numbers.size()).isEqualTo(3);
+    }
+
+
+    @ParameterizedTest
+    @ValueSource(ints = {1, 2, 3})
+    @DisplayName("Set 값 존재여부 확인")
+    public void setTest02(int inputNumber) throws Exception {
+        assertThat(numbers.contains(inputNumber)).isTrue();
+    }
+
+    @ParameterizedTest
+    @CsvSource(value = {"0:false","1:true","2:true","3:true","4:false"}, delimiter = ':')
+    @DisplayName("Set 값 존재 확인")
+    public void setTest03(int inputNumber, boolean isFree) throws Exception {
+        assertThat(numbers.contains(inputNumber)).isEqualTo(isFree);
+    }
+}

src/test/java/study/StringTest.java

@@ -0,0 +1,51 @@
+package study;
+
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+// String 클래스에 대한 학습 테스트
+@DisplayName("String 클래스에 대한 학습 테스트")
+public class StringTest {
+
+    @Test
+    @DisplayName("문자열 1,2 나누기")
+    public void stringTest01() throws Exception {
+        String[] result = "1,2".split(",");
+//        assertThat(result).contains("1", "2");
+        assertThat(result).containsExactly("1", "2");
+    }
+
+    @Test
+    @DisplayName("문자열 1, 나누기")
+    public void stringTest02() throws Exception {
+        String[] result = "1,".split(",");
+        assertThat(result).containsExactly("1");
+    }
+
+    @Test
+    @DisplayName("문자열 (1,2) substring 으로 ()제거하기")
+    public void stringTest03() throws Exception {
+        String data = "(1,2)";
+        String result = data.substring(1, data.length()-1);
+        assertThat(result).isEqualTo("1,2");
+    }
+
+    @Test
+    @DisplayName("문자열 abc 뽑아내기")
+    public void stringTest04() throws Exception {
+        String data = "abc";
+
+        assertEquals(data.charAt(0), 'a');
+        assertEquals(data.charAt(1), 'b');
+        assertEquals(data.charAt(2), 'c');
+
+        assertThatThrownBy(() -> {
+            data.charAt(3);
+        }).isInstanceOf(IndexOutOfBoundsException.class)
+                .hasMessageContaining("String index out of range: 3");
+    }
+}