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Write Unit tests for RegistrationPresenter.

Example for unit testing of AccountPresenter(https://github.com/openMF/mifos-mobile/blob/development/app/src/main/java/org/mifos/mobilebanking/presenters/AccountsPresenter.java) can be seen in AccountsPresenterTest(https://github.com/openMF/mifos-mobile/blob/development/app/src/test/java/org/mifos/mobilebanking/AccountsPresenterTest.java)