refactor listener modules

scm-webapp/src/test/java/sonia/scm/EagerSingletonModuleTest.java

@@ -0,0 +1,47 @@
+package sonia.scm;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import org.junit.jupiter.api.Test;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class EagerSingletonModuleTest {
+
+  @Test
+  void shouldInitializeEagerSingletons() {
+    Injector injector = Guice.createInjector(new EagerSingletonModule(), new EagerTestModule());
+    injector.getInstance(EagerSingletonModule.class).initialize(injector);
+
+    Capturer capturer = injector.getInstance(Capturer.class);
+    assertThat(capturer.value).isEqualTo("eager!");
+  }
+
+  public static class EagerTestModule extends AbstractModule {
+
+    @Override
+    protected void configure() {
+      bind(Capturer.class);
+      bind(Eager.class);
+    }
+  }
+
+  @Singleton
+  public static class Capturer {
+    private String value;
+  }
+
+  @EagerSingleton
+  public static class Eager {
+
+    @Inject
+    public Eager(Capturer capturer) {
+      capturer.value = "eager!";
+    }
+  }
+
+}