Unit tests for ThrottleFilter

Change-Id: I51fb91433e663be5fea3ae10ebaf4ae24ee99fba
Signed-off-by: Emmett Cox <emmett.cox@ericsson.com>
Issue-ID: DMAAP-101

diff --git a/datarouter-prov/src/test/java/org/onap/dmaap/datarouter/provisioning/utils/ThrottleFilterTest.java b/datarouter-prov/src/test/java/org/onap/dmaap/datarouter/provisioning/utils/ThrottleFilterTest.java
new file mode 100644 (file)
index 0000000..a8e919b
--- /dev/null
+++ b/datarouter-prov/src/test/java/org/onap/dmaap/datarouter/provisioning/utils/ThrottleFilterTest.java
@@ -0,0 +1,218 @@
+/*******************************************************************************
+ * ============LICENSE_START==================================================
+ * * org.onap.dmaap
+ * * ===========================================================================
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * * ===========================================================================
+ * * Licensed under the Apache License, Version 2.0 (the "License");
+ * * you may not use this file except in compliance with the License.
+ * * You may obtain a copy of the License at
+ * *
+ *  *      http://www.apache.org/licenses/LICENSE-2.0
+ * *
+ *  * Unless required by applicable law or agreed to in writing, software
+ * * distributed under the License is distributed on an "AS IS" BASIS,
+ * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * * See the License for the specific language governing permissions and
+ * * limitations under the License.
+ * * ============LICENSE_END====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+
+package org.onap.dmaap.datarouter.provisioning.utils;
+
+import org.apache.commons.lang3.reflect.FieldUtils;
+import org.eclipse.jetty.continuation.Continuation;
+import org.eclipse.jetty.continuation.ContinuationSupport;
+import org.eclipse.jetty.io.EndPoint;
+import org.eclipse.jetty.server.HttpChannel;
+import org.eclipse.jetty.server.HttpConnection;
+import org.eclipse.jetty.server.Request;
+import org.junit.Test;
+
+import org.junit.runner.RunWith;
+import static org.junit.Assert.*;
+import static org.hamcrest.core.Is.is;
+import org.mockito.Mock;
+
+import static org.mockito.Matchers.*;
+import static org.mockito.Mockito.*;
+
+import org.onap.dmaap.datarouter.provisioning.beans.Parameters;
+import org.powermock.api.mockito.PowerMockito;
+import org.powermock.core.classloader.annotations.SuppressStaticInitializationFor;
+import org.powermock.modules.junit4.PowerMockRunner;
+
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.*;
+
+@RunWith(PowerMockRunner.class)
+@SuppressStaticInitializationFor({"org.onap.dmaap.datarouter.provisioning.beans.Parameters",
+                                  "org.eclipse.jetty.server.Request",
+                                  "org.eclipse.jetty.continuation.ContinuationSupport",
+                                  "org.eclipse.jetty.server.HttpConnection"})
+public class ThrottleFilterTest {
+
+    @Mock
+    private HttpServletRequest request;
+
+    @Mock
+    private HttpServletResponse response;
+
+    @Mock
+    private FilterChain filterchain;
+
+    @Mock
+    private HttpConnection httpconnection;
+
+    @Mock
+    private ContinuationSupport continuationsupport;
+
+    @Mock
+    private Request req;
+
+    @Mock
+    private HttpChannel httpchannel;
+
+    @Mock
+    private Continuation continuation;
+
+
+
+    @Test
+    public void Given_Throttle_Filter_Configure_And_Parameter_Is_Not_Null_Then_Enabled_And_Action_Is_True() throws Exception {
+        mockParametersWithValues("2,5,throttle");
+        ThrottleFilter.configure();
+        boolean enabled = (boolean) FieldUtils.readStaticField(ThrottleFilter.class, "enabled", true);
+        int action = (int) FieldUtils.readStaticField(ThrottleFilter.class, "action", true);
+        assertThat(enabled, is(true));
+        assertThat(action, is(0));
+
+    }
+
+    @Test
+    public void Given_Do_Filter_run_and_enabled_and_action_is_true_and_rate_is_0_then_continiuation_will_call_setAttribute_and_resume_once() throws Exception {
+        mockParametersWithValues("100,5,thing");
+        ThrottleFilter throttlefilter = new ThrottleFilter();
+        ThrottleFilter.configure();
+        mockServletInputStream();
+        FieldUtils.writeDeclaredStaticField(ThrottleFilter.class, "action", 1, true);
+        Map<String, List<Continuation>> suspended_requests = new HashMap<String, List<Continuation>>();
+        List<Continuation> continuation_list = new ArrayList<>();
+        continuation_list.add(continuation);
+        suspended_requests.put("null/-1", continuation_list);
+        FieldUtils.writeDeclaredField(throttlefilter, "suspended_requests", suspended_requests, true);
+        throttlefilter.doFilter(request, response, filterchain);
+        verify(continuation, times(1)).setAttribute(anyString(), any());
+        verify(continuation, times(1)).resume();
+    }
+
+    @Test
+    public void Given_Do_Filter_Run_and_enabled_and_action_is_true_and_rate_is_greater_than_0_then_continuation_will_call_suspend_and_dispatch_once() throws Exception {
+        mockParametersWithValues("0,5,thing");
+        mockContinuationSupport();
+        ThrottleFilter.configure();
+        mockServletInputStream();
+        FieldUtils.writeDeclaredStaticField(ThrottleFilter.class, "action", 1, true);
+        ThrottleFilter throttlefilter = new ThrottleFilter();
+        throttlefilter.doFilter(request, response, filterchain);
+        verify(continuation, times(1)).undispatch();
+        verify(continuation, times(1)).suspend();
+    }
+
+
+    @Test
+    public void Given_Do_Filter_Run_and_enabled_and_action_is_true_and_rate_is_greater_than_0_and_getFeedId_returns_id_then_continuation_will_call_suspend_and_dispatch_once() throws Exception {
+        mockParametersWithValues("0,5,thing");
+        PowerMockito.mockStatic(ContinuationSupport.class);
+        PowerMockito.when(continuationsupport.getContinuation(any())).thenReturn(continuation);
+        ThrottleFilter.configure();
+        mockServletInputStream();
+        FieldUtils.writeDeclaredStaticField(ThrottleFilter.class, "action", 1, true);
+        ThrottleFilter throttlefilter = new ThrottleFilter();
+        when(request.getPathInfo()).thenReturn("/123/fileName.txt");
+        throttlefilter.doFilter(request, response, filterchain);
+        verify(continuation, times(1)).undispatch();
+        verify(continuation, times(1)).suspend();
+    }
+
+    @Test
+    public void Given_Do_Filter_and_only_enabled_is_true_and_drop_filter_ran_then_request_will_call_getHttpChannel_and_HttpChannel_will_call_getEndPoint_once() throws Exception {
+        mockParametersWithValues("0,5,thing");
+        ServletInputStream serverinputstream = mock(ServletInputStream.class);
+        mockHttpConnectionHttpChannelAndRequest(serverinputstream);
+        ThrottleFilter.configure();
+        FieldUtils.writeDeclaredStaticField(ThrottleFilter.class, "action", 0, true);
+        ThrottleFilter throttlefilter = new ThrottleFilter();
+        throttlefilter.doFilter(request, response, filterchain);
+        verify(req, times(1)).getHttpChannel();
+        verify(httpchannel, times(1)).getEndPoint();
+    }
+
+    @Test
+    public void Given_run_is_called_then_continuation_will_call_prune_once() throws Exception {
+        ThrottleFilter tf = new ThrottleFilter();
+        Map<String, ThrottleFilter.Counter> map = new HashMap<String, ThrottleFilter.Counter>();
+        ThrottleFilter.Counter tfc = mock(ThrottleFilter.Counter.class);
+        map.put("Key", tfc);
+        when(tfc.prune()).thenReturn(-1);
+        FieldUtils.writeDeclaredField(tf, "map", map, true);
+        tf.run();
+        verify(tfc, times(1)).prune();
+    }
+
+    @Test
+    public void Given_destroy_is_called_then_map_is_empty() throws Exception
+    {
+        ThrottleFilter throttleFilter = new ThrottleFilter();
+        FilterConfig filterconfig = mock(FilterConfig.class);
+        mockParametersWithValues("0,5,thing");
+        PowerMockito.mockStatic(ContinuationSupport.class);
+        PowerMockito.when(continuationsupport.getContinuation(any())).thenReturn(continuation);
+
+        throttleFilter.init(filterconfig);
+        throttleFilter.destroy();
+    }
+
+    private Parameters getParameters() {
+        PowerMockito.mockStatic(Parameters.class);
+        return mock(Parameters.class);
+    }
+
+    private void mockServletInputStream() throws IOException {
+        ServletInputStream serverinputstream = mock(ServletInputStream.class);
+        when(serverinputstream.read(any())).thenReturn(2).thenReturn(1).thenReturn(0);
+        when(request.getInputStream()).thenReturn(serverinputstream);
+    }
+
+    private void mockParametersWithValues(String values) {
+        Parameters parameters = getParameters();
+        PowerMockito.when(parameters.getParameter(anyString())).thenReturn(new Parameters("key", values));
+    }
+
+    private void mockContinuationSupport() {
+        PowerMockito.mockStatic(ContinuationSupport.class);
+        PowerMockito.when(continuationsupport.getContinuation(any())).thenReturn(continuation);
+    }
+
+    private void mockHttpConnectionHttpChannelAndRequest(ServletInputStream serverinputstream) throws IOException {
+        PowerMockito.mockStatic(ContinuationSupport.class);
+        PowerMockito.when(continuationsupport.getContinuation(any())).thenReturn(continuation);
+        when(serverinputstream.read(any())).thenReturn(2).thenReturn(1).thenReturn(0);
+        when(request.getInputStream()).thenReturn(serverinputstream);
+        PowerMockito.mockStatic(HttpConnection.class);
+        EndPoint endpoint = mock(EndPoint.class);
+        PowerMockito.when(httpconnection.getCurrentConnection()).thenReturn(httpconnection);
+        PowerMockito.when(httpconnection.getHttpChannel()).thenReturn(httpchannel);
+        when(httpchannel.getRequest()).thenReturn(req);
+        when(req.getHttpChannel()).thenReturn(httpchannel);
+        when(httpchannel.getEndPoint()).thenReturn(endpoint);
+    }
+}