implemented restarter to move control over the restart process to the core

scm-webapp/src/test/java/sonia/scm/lifecycle/DefaultRestarterTest.java

@@ -0,0 +1,69 @@
+package sonia.scm.lifecycle;
+
+import com.github.legman.Subscribe;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import sonia.scm.event.ScmEventBus;
+
+import javax.swing.*;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.verify;
+
+@ExtendWith(MockitoExtension.class)
+class DefaultRestarterTest {
+
+  @Mock
+  private ScmEventBus eventBus;
+
+  @Captor
+  private ArgumentCaptor<RestartEvent> eventCaptor;
+
+  @Test
+  void shouldLoadStrategyOnCreation() {
+    System.setProperty(RestartStrategyFactory.PROPERTY_STRATEGY, ExitRestartStrategy.NAME);
+    try {
+      DefaultRestarter restarter = new DefaultRestarter();
+      assertThat(restarter.isSupported()).isTrue();
+    } finally {
+      System.clearProperty(RestartStrategyFactory.PROPERTY_STRATEGY);
+    }
+  }
+
+  @Test
+  void shouldReturnFalseIfRestartStrategyIsNotAvailable() {
+    DefaultRestarter restarter = new DefaultRestarter(eventBus, null);
+    assertThat(restarter.isSupported()).isFalse();
+  }
+
+  @Test
+  void shouldReturnTrueIfRestartStrategyIsAvailable() {
+    DefaultRestarter restarter = new DefaultRestarter();
+    assertThat(restarter.isSupported()).isTrue();
+  }
+
+  @Test
+  void shouldThrowRestartNotSupportedException() {
+    DefaultRestarter restarter = new DefaultRestarter(eventBus,null);
+    assertThrows(
+      RestartNotSupportedException.class, () -> restarter.restart(DefaultRestarterTest.class, "test")
+    );
+  }
+
+  @Test
+  void shouldFireRestartEvent() {
+    DefaultRestarter restarter = new DefaultRestarter(eventBus, new ExitRestartStrategy());
+    restarter.restart(DefaultRestarterTest.class, "testing");
+
+    verify(eventBus).post(eventCaptor.capture());
+
+    RestartEvent event = eventCaptor.getValue();
+    assertThat(event.getCause()).isEqualTo(DefaultRestarterTest.class);
+    assertThat(event.getReason()).isEqualTo("testing");
+  }
+}