Examples of org.eclipse.jgit.lib.RefUpdate.update()

org.eclipse.jgit.lib.RefUpdate.update()
Gracefully update the ref to the new value.
Merge test will be performed according to {@link #isForceUpdate()}.
This is the same as:
```
 return update(new RevWalk(getRepository())); 
```
@return the result status of the update. @throws IOException an unexpected IO error occurred while writing changes.

  @Test
  public void testUpdateRefNoChange() throws IOException {
    ObjectId pid = db.resolve("refs/heads/master");
    RefUpdate updateRef = db.updateRef("refs/heads/master");
    updateRef.setNewObjectId(pid);
    Result update = updateRef.update();
    assertEquals(Result.NO_CHANGE, update);
    assertEquals(pid, db.resolve("refs/heads/master"));
  }


  /**

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    ObjectId newValue = db.resolve("HEAD^");
    // first make HEAD refer to loose ref
    RefUpdate updateRef = db.updateRef(Constants.HEAD);
    updateRef.setForceUpdate(true);
    updateRef.setNewObjectId(newValue);
    Result update = updateRef.update();
    assertEquals(Result.FORCED, update);


    // now update that ref
    updateRef = db.updateRef(Constants.HEAD);
    updateRef.setNewObjectId(oldValue);

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    assertEquals(Result.FORCED, update);


    // now update that ref
    updateRef = db.updateRef(Constants.HEAD);
    updateRef.setNewObjectId(oldValue);
    update = updateRef.update();
    assertEquals(Result.FAST_FORWARD, update);


    allRefs = db.getAllRefs();
    Ref master = allRefs.get("refs/heads/master");
    Ref head = allRefs.get("HEAD");

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    ObjectId oldValue = db.resolve("HEAD");
    writeSymref(Constants.HEAD, "refs/heads/newref");
    RefUpdate updateRef = db.updateRef(Constants.HEAD);
    updateRef.setForceUpdate(true);
    updateRef.setNewObjectId(oldValue);
    Result update = updateRef.update();
    assertEquals(Result.NEW, update);


    allRefs = db.getAllRefs();
    Ref head = allRefs.get("HEAD");
    Ref newref = allRefs.get("refs/heads/newref");

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  public void testUpdateRefLockFailureWrongOldValue() throws IOException {
    ObjectId pid = db.resolve("refs/heads/master");
    RefUpdate updateRef = db.updateRef("refs/heads/master");
    updateRef.setNewObjectId(pid);
    updateRef.setExpectedOldObjectId(db.resolve("refs/heads/master^"));
    Result update = updateRef.update();
    assertEquals(Result.LOCK_FAILURE, update);
    assertEquals(pid, db.resolve("refs/heads/master"));
  }


  /**

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    ObjectId pid = db.resolve("refs/heads/master");


    RefUpdate updateRef = db.updateRef("refs/heads/master");
    updateRef.setNewObjectId(ppid);
    updateRef.setForceUpdate(true);
    Result update = updateRef.update();
    assertEquals(Result.FORCED, update);
    assertEquals(ppid, db.resolve("refs/heads/master"));


    // real test
    RefUpdate updateRef2 = db.updateRef("refs/heads/master");

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    // real test
    RefUpdate updateRef2 = db.updateRef("refs/heads/master");
    updateRef2.setExpectedOldObjectId(ppid);
    updateRef2.setNewObjectId(pid);
    Result update2 = updateRef2.update();
    assertEquals(Result.FAST_FORWARD, update2);
    assertEquals(pid, db.resolve("refs/heads/master"));
  }


  /**

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    ObjectId pid = db.resolve("refs/heads/master");


    RefUpdate updateRef = db.updateRef("refs/heads/master");
    updateRef.setNewObjectId(ppid);
    updateRef.setForceUpdate(true);
    Result update = updateRef.update();
    assertEquals(Result.FORCED, update);
    assertEquals(ppid, db.resolve("refs/heads/master"));


    // real test
    RevCommit old = new RevWalk(db).parseCommit(ppid);

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    // real test
    RevCommit old = new RevWalk(db).parseCommit(ppid);
    RefUpdate updateRef2 = db.updateRef("refs/heads/master");
    updateRef2.setExpectedOldObjectId(old);
    updateRef2.setNewObjectId(pid);
    Result update2 = updateRef2.update();
    assertEquals(Result.FAST_FORWARD, update2);
    assertEquals(pid, db.resolve("refs/heads/master"));
  }


  /**

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    updateRef.setNewObjectId(pid);
    LockFile lockFile1 = new LockFile(new File(db.getDirectory(),
        "refs/heads/master"), db.getFS());
    try {
      assertTrue(lockFile1.lock()); // precondition to test
      Result update = updateRef.update();
      assertEquals(Result.LOCK_FAILURE, update);
      assertEquals(opid, db.resolve("refs/heads/master"));
      LockFile lockFile2 = new LockFile(new File(db.getDirectory(),"refs/heads/master"),
          db.getFS());
      assertFalse(lockFile2.lock()); // was locked, still is

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