test: 종료 신호를 처리하는 객체를 등록하는 것을 검증

test/build.gradle

@@ -28,6 +28,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
     testImplementation 'org.testcontainers:junit-jupiter:1.20.4'
     testImplementation 'org.testcontainers:testcontainers:1.20.4'
+    testImplementation 'com.github.stefanbirkner:system-lambda:1.2.1'
 }
 
 tasks.named('test') {

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

@@ -0,0 +1,33 @@
+package io.jeyong.test.unit;
+
+import static io.jeyong.handler.SignalHandlerRegistrar.SIGNAL_TYPE;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.jeyong.handler.ApplicationTerminator;
+import io.jeyong.handler.SignalHandlerRegistrar;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import sun.misc.Signal;
+import sun.misc.SignalHandler;
+
+@DisplayName("SignalHandlerRegistrar Unit Test")
+public class SignalHandlerRegistrarTest {
+
+    @Test
+    @DisplayName("SignalHandler should be registered correctly")
+    void testSignalHandlerRegistration() {
+        // given
+        SignalHandler mockSignalHandler = signal -> System.out.println("Mock signal handler");
+        ApplicationTerminator applicationTerminator = status -> mockSignalHandler;
+        SignalHandlerRegistrar registrar = new SignalHandlerRegistrar(applicationTerminator);
+
+        // when
+        registrar.registerHandler();
+
+        Signal registeredSignal = new Signal(SIGNAL_TYPE);
+        SignalHandler registeredHandler = Signal.handle(registeredSignal, null);
+
+        // then
+        assertThat(registeredHandler).isEqualTo(mockSignalHandler);
+    }
+}