Returns the Left value contained in the wrapped LeftProjection, if defined as a Left, else throws TestFailedException with
a detail message indicating the Either was defined as a Right, not a Left.
Returns the Left value contained in the wrapped LeftProjection, if defined as a Left, else throws TestFailedException with
a detail message indicating the Either was defined as a Right, not a Left.
Wrapper class that adds a
valuemethod toLeftProjection, allowing you to make statements like:either.left.value should be > 9