From cd80dfe0b2c9a349dd3403639e68a288c5bb2f71 Mon Sep 17 00:00:00 2001
From: rigyeonghong <zxcvbee@naver.com>
Date: Thu, 3 Apr 2025 16:28:50 +0900
Subject: [PATCH] =?UTF-8?q?Step1=20-=20=ED=95=99=EC=8A=B5=20=ED=85=8C?=
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---
 src/test/java/.gitkeep              |  0
 src/test/java/study/SetTest.java    | 43 +++++++++++++++++++++++++++++
 src/test/java/study/StringTest.java | 34 +++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 delete mode 100644 src/test/java/.gitkeep
 create mode 100644 src/test/java/study/SetTest.java
 create mode 100644 src/test/java/study/StringTest.java

diff --git a/src/test/java/.gitkeep b/src/test/java/.gitkeep
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/src/test/java/study/SetTest.java b/src/test/java/study/SetTest.java
new file mode 100644
index 00000000000..967adf6b92f
--- /dev/null
+++ b/src/test/java/study/SetTest.java
@@ -0,0 +1,43 @@
+package study;
+
+import org.junit.jupiter.api.BeforeEach;
+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.AssertionsForClassTypes.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
+    void size() {
+        int size = numbers.size();
+        assertThat(size).isEqualTo(3);
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = {1,2,3})
+    void contains(Integer input) {
+        assertThat(numbers.contains(input)).isTrue();
+    }
+
+    @ParameterizedTest
+    @CsvSource(value = {"1:true", "2:true", "4:false"}, delimiter = ':')
+    void contains(Integer input, Boolean expected) {
+        assertThat(numbers.contains(input)).isEqualTo(expected);
+    }
+}
diff --git a/src/test/java/study/StringTest.java b/src/test/java/study/StringTest.java
new file mode 100644
index 00000000000..657c7755245
--- /dev/null
+++ b/src/test/java/study/StringTest.java
@@ -0,0 +1,34 @@
+package study;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+public class StringTest {
+    @Test
+    void split() {
+        String[] result = "1,2".split(",");
+        assertThat(result).contains("1");
+        assertThat(result).containsExactly("1","2");
+    }
+
+    @Test
+    void substring() {
+        String text = "(1,2)";
+        String result = text.substring(1, text.length()-1);
+        assertThat(result).isEqualTo("1,2");
+    }
+
+    @Test
+    @DisplayName("주어진 문자의 특정 위치 값을 벗어나면 예외 발생")
+    void charAt() {
+        String text = "abc";
+        int len = text.length();
+        assertThatThrownBy(() -> {
+            text.charAt(len);
+        }).isInstanceOf(IndexOutOfBoundsException.class)
+                .hasMessageContaining("String index out of range: " + len);
+    }
+}