Backward compatibility for handling promise

[ajzkk]

Support backward compatibility with warning message for handling promise.

Update invalid test cases

• expect(foo, "bar") always return true and the correct way is assert.equal(foo, "bar")
• if (err) done(err); done function must call if there is any error. Otherwise the unit test asserting will be mark as error and not showing the failed result properly.

[sonarcloud[bot]]

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7.3% Duplication