Previously newTestRequest() creates request object and returns
signature v4 signed request. In TestCopyObject(), its required to add
headers later to the request and sign the request.
This patch introduces two new functions
* signRequest(): signs request using given access/secret keys.
* newTestSignedRequest(): returns new request object signed with given
access/secret keys.
Fixes#2097
PR contains,
- New setup utilities for running object handler tests. Here is why they are essential,
- Unit tests have to be run in isolation without being have to be associated with other functionalities which are not under test.
- The integration tests follows the philosophy of running a Test Server and registers all handlers and fires HTTP requests over the socket to simulate the system functionality under usual work load scenarios and test for correctness. But this philosophy cannot be adopted for running unit tests for HTTP handlers.
- Running Unit tests for API handlers,
- Shouldn't run a test server. Should purely call the handlers `ServeHTTP` under isolation.
- Shouldn't register all handlers, should only register handlers under test and so that the system is close to be in an isolated setup.
- As an example PutBucketPolicy test is illustrated using the new setup. Exhaustive cases has to be added and has been listen in TODO for now.
Harshavardhana