add some test cases

tests/fallback.exp

+[_Tuple3 [2] [2] [1]]
\ No newline at end of file

tests/fallback.sapl

+main = _Tuple3 (test B True) (test (A 1 2) False) (test (A 1 2) True)
+:: A = A x y | B
+test a b = case a (A x y -> case b (True -> 1)) (_ -> 2)

tests/to2dec.exp

+["123.46"]
\ No newline at end of file

tests/to2dec.sapl

+main = R2S (jurrien.to2dec 123.456)
+jurrien.to2dec::D !n_0::D = divR (I2R (R2I (multR n_0 100.0))) 100.0
\ No newline at end of file