added RestartServlet, which is able to trigger a complete restart of the context

scm-webapp/src/test/java/sonia/scm/boot/ServletContextCleanerTest.java

@@ -0,0 +1,53 @@
+package sonia.scm.boot;
+
+import com.google.common.collect.ImmutableSet;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import javax.servlet.ServletContext;
+
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.Set;
+import java.util.Vector;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ServletContextCleanerTest {
+
+  @Mock
+  private ServletContext servletContext;
+
+  @Test
+  public void testCleanup() {
+    Set<String> names = ImmutableSet.of(
+      "org.jboss.resteasy.Dispatcher",
+      "resteasy.Deployment",
+      "sonia.scm.Context",
+      "org.eclipse.jetty.HttpServer",
+      "javax.servlet.Context",
+      "org.apache.shiro.SecurityManager"
+    );
+
+    when(servletContext.getAttributeNames()).thenReturn(toEnumeration(names));
+
+    ServletContextCleaner.cleanup(servletContext);
+
+    verify(servletContext).removeAttribute("org.jboss.resteasy.Dispatcher");
+    verify(servletContext).removeAttribute("resteasy.Deployment");
+    verify(servletContext).removeAttribute("sonia.scm.Context");
+    verify(servletContext, never()).removeAttribute("org.eclipse.jetty.HttpServer");
+    verify(servletContext, never()).removeAttribute("javax.servlet.Context");
+    verify(servletContext).removeAttribute("org.apache.shiro.SecurityManager");
+  }
+
+  private <T> Enumeration<T> toEnumeration(Collection<T> collection) {
+    return new Vector<>(collection).elements();
+  }
+}