added cache-control header to api response, to fix stale data on ie11

scm-webapp/src/test/java/sonia/scm/api/v2/CacheControlResponseFilterTest.java

@@ -0,0 +1,61 @@
+package sonia.scm.api.v2;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerResponseContext;
+import javax.ws.rs.core.EntityTag;
+import javax.ws.rs.core.MultivaluedMap;
+import java.util.Date;
+
+import static org.mockito.Mockito.*;
+
+@RunWith(MockitoJUnitRunner.class)
+public class CacheControlResponseFilterTest {
+
+  @Mock
+  private ContainerRequestContext requestContext;
+
+  @Mock
+  private ContainerResponseContext responseContext;
+
+  @Mock
+  private MultivaluedMap<String, Object> headers;
+
+  private CacheControlResponseFilter filter = new CacheControlResponseFilter();
+
+  @Before
+  public void setUpMocks() {
+    when(responseContext.getHeaders()).thenReturn(headers);
+  }
+
+  @Test
+  public void filterShouldAddCacheControlHeader() {
+    filter.filter(requestContext, responseContext);
+
+    verify(headers).add("Cache-Control", "no-cache");
+  }
+
+  @Test
+  public void filterShouldNotSetHeaderIfLastModifiedIsNotNull() {
+    when(responseContext.getLastModified()).thenReturn(new Date());
+
+    filter.filter(requestContext, responseContext);
+
+    verify(headers, never()).add("Cache-Control", "no-cache");
+  }
+
+  @Test
+  public void filterShouldNotSetHeaderIfEtagIsNotNull() {
+    when(responseContext.getEntityTag()).thenReturn(new EntityTag("42"));
+
+    filter.filter(requestContext, responseContext);
+
+    verify(headers, never()).add("Cache-Control", "no-cache");
+  }
+
+}