Implement simple merge dry run

scm-plugins/scm-git-plugin/src/test/java/sonia/scm/repository/spi/GitMergeDryRunCommandTest.java

@@ -0,0 +1,23 @@
+package sonia.scm.repository.spi;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class GitMergeDryRunCommandTest extends AbstractGitCommandTestBase {
+  @Test
+  public void shouldDetectNotMergeableBranches() {
+    GitMergeDryRunCommand command = createCommand();
+    MergeDryRunCommandRequest request = new MergeDryRunCommandRequest();
+    request.setBranchToMerge("test-branch");
+    request.setTargetBranch("master");
+
+    boolean mergeable = command.isMergeable(request);
+
+    Assert.assertFalse(mergeable);
+  }
+
+  private GitMergeDryRunCommand createCommand()
+  {
+    return new GitMergeDryRunCommand(createContext(), repository);
+  }
+}