Close Repository to fix tests failing on Windows

Fix tests failing on Windows because Repository
instance is created but not closed on tear down.

Change-Id: I72488ba5efeec95110926b1fbd56b7d96fca0d37
Signed-off-by: Nail Samatov <sanail@yandex.ru>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java

@@ -46,6 +46,7 @@ import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
+import org.junit.After;
 import org.junit.Before;
 
 /**
@@ -187,6 +188,13 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 		trash = db.getWorkTree();
 	}
 
+	@Override
+	@After
+	public void tearDown() throws Exception {
+		db.close();
+		super.tearDown();
+	}
+
 	/**
 	 * Represent the state of the index in one String. This representation is
 	 * useful when writing tests which do assertions on the state of the index.