added PushStateDispatcher for production and development to WebResourceServlet

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

@@ -0,0 +1,31 @@
+package sonia.scm;
+
+import org.assertj.core.api.Assertions;
+import org.junit.After;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class PushStateDispatcherProviderTest {
+
+  private PushStateDispatcherProvider provider = new PushStateDispatcherProvider();
+
+  @Test
+  public void testGetProxyPushStateWithPropertySet() {
+    System.setProperty(PushStateDispatcherProvider.PROPERTY_TARGET, "http://localhost:9966");
+    PushStateDispatcher dispatcher = provider.get();
+    Assertions.assertThat(dispatcher).isInstanceOf(ProxyPushStateDispatcher.class);
+  }
+
+  @Test
+  public void testGetProxyPushStateWithoutProperty() {
+    PushStateDispatcher dispatcher = provider.get();
+    Assertions.assertThat(dispatcher).isInstanceOf(ForwardingPushStateDispatcher.class);
+  }
+
+  @After
+  public void cleanupSystemProperty() {
+    System.clearProperty(PushStateDispatcherProvider.PROPERTY_TARGET);
+  }
+
+}