test: 입출력 구현체 테스트 작성

Author: wonu606

calculator/build.gradle

@@ -12,6 +12,9 @@ repositories {
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+
+    // https://mvnrepository.com/artifact/org.assertj/assertj-core
+    testImplementation 'org.assertj:assertj-core:3.24.2'
 }
 
 test {

calculator/src/test/java/com/wonu606/io/ConsoleInputTest.java

@@ -0,0 +1,48 @@
+package com.wonu606.io;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class ConsoleInputTest {
+
+    @Test
+    @DisplayName("메뉴 입력")
+    void testMenuSelectionInput() throws IOException {
+        String menuSelection = "1";
+        InputStream in = new ByteArrayInputStream(menuSelection.getBytes());
+        System.setIn(in);
+
+        Input input;
+        assertThat(menuSelection).isEqualTo(input.getInput());
+        input.tearDown();
+    }
+
+    @Test
+    @DisplayName("표현식 입력")
+    void testExpressionInput() throws IOException {
+        String expression = "2 + 3";
+        InputStream in = new ByteArrayInputStream(expression.getBytes());
+        System.setIn(in);
+
+        Input input;
+        assertThat(expression).isEqualTo(input.getInput());
+        input.tearDown();
+    }
+
+    @Test
+    @DisplayName("개행 입력")
+    void testNewLineInput() throws IOException {
+        String newLine = "\n";
+        InputStream in = new ByteArrayInputStream(newLine.getBytes());
+        System.setIn(in);
+
+        Input input;
+        assertThat("").isEqualTo(input.getInput());
+        input.tearDown();
+    }
+}

calculator/src/test/java/com/wonu606/io/ConsolePrinterTest.java

@@ -0,0 +1,38 @@
+package com.wonu606.io;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class ConsolePrinterTest {
+
+    @Test
+    @DisplayName("정수 출력")
+    void testIntegerPrint() {
+        OutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+
+        Print printer;
+        int number = -1;
+        printer.print(number);
+
+        assertThat(Integer.toString(number)).isEqualTo(out.toString().trim());
+    }
+
+    @Test
+    @DisplayName("문자열 출력")
+    void testStringPrint() {
+        OutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+
+        Print printer;
+        String str = "Hello World";
+        printer.print(str);
+
+        assertThat(str).isEqualTo(out.toString().trim());
+    }
+}