[FIXED JENKINS-8342] Pulled from hajoeichler and added testcase to verify the issue

Author: pnyheim

src/test/java/hudson/plugins/git/GitSCMTest.java

@@ -15,6 +15,8 @@
 import hudson.plugins.git.opt.PreBuildMergeOptions;
 import hudson.plugins.git.util.DefaultBuildChooser;
 import hudson.util.StreamTaskListener;
+
+import org.jvnet.hudson.test.Bug;
 import org.jvnet.hudson.test.CaptureEnvironmentBuilder;
 import org.jvnet.hudson.test.HudsonTestCase;
 
@@ -88,6 +90,33 @@ public void testBasicExcludedRegion() throws Exception {
         assertFalse("scm polling should not detect any more changes after build", project.pollSCMChanges(listener));
     }
 
+    @Bug(value = 8342)
+    public void testExcludedRegionMultiCommit() throws Exception {
+        // Got 2 projects, each one should only build if changes in its own file
+        FreeStyleProject clientProject = setupProject("master", false, null, ".*serverFile", null);
+        FreeStyleProject serverProject = setupProject("master", false, null, ".*clientFile", null);
+        String initialCommitFile = "initialFile";
+        commit(initialCommitFile, johnDoe, "initial commit");
+        build(clientProject, Result.SUCCESS, initialCommitFile);
+        build(serverProject, Result.SUCCESS, initialCommitFile);
+
+        assertFalse("scm polling should not detect any more changes after initial build", clientProject.poll(listener).hasChanges());
+        assertFalse("scm polling should not detect any more changes after initial build", serverProject.poll(listener).hasChanges());
+
+        // Got commits on serverFile, so only server project should build.
+        commit("myserverFile", johnDoe, "commit first server file");
+
+        assertFalse("scm polling should not detect any changes in client project", clientProject.poll(listener).hasChanges());
+        assertTrue("scm polling did not detect changes in server project", serverProject.poll(listener).hasChanges());
+
+        // Got commits on both client and serverFile, so both projects should build.
+        commit("myNewserverFile", johnDoe, "commit new server file");
+        commit("myclientFile", johnDoe, "commit first clientfile");
+
+        assertTrue("scm polling did not detect changes in client project", clientProject.poll(listener).hasChanges());
+        assertTrue("scm polling did not detect changes in server project", serverProject.poll(listener).hasChanges());
+    }
+
     public void testBasicExcludedUser() throws Exception {
         FreeStyleProject project = setupProject("master", false, null, null, "Jane Doe");