test: 종료 코드로 종료하는 것을 검증

test/src/test/java/io/jeyong/test/unit/SystemTerminatorTest.java

@@ -0,0 +1,29 @@
+package io.jeyong.test.unit;
+
+import static com.github.stefanbirkner.systemlambda.SystemLambda.catchSystemExit;
+import static io.jeyong.handler.SignalHandlerRegistrar.EXIT_CODE;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.jeyong.handler.SystemTerminator;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import sun.misc.SignalHandler;
+
+@DisplayName("SystemTerminator Unit Test")
+public class SystemTerminatorTest {
+
+    @Test
+    @DisplayName("System.exit should be called with the expected status code")
+    void testHandleTerminationCallsSystemExit() throws Exception {
+        // given
+        SystemTerminator terminator = new SystemTerminator();
+        int expectedStatusCode = EXIT_CODE;
+        SignalHandler handler = terminator.handleTermination(expectedStatusCode);
+
+        // when
+        int actualExitCode = catchSystemExit(() -> handler.handle(null));
+
+        // then
+        assertThat(actualExitCode).isEqualTo(expectedStatusCode);
+    }
+}