continue refactoring to optimize for mtl

mtl/test_parser.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+from hypothesis import event, given
+
+import mtl
+from mtl.hypothesis import MetricTemporalLogicStrategy
+
+
+@given(MetricTemporalLogicStrategy)
+def test_invertable_repr(phi):
+    event(str(phi))
+    assert str(phi) == str(mtl.parse(str(phi)))
+
+
+@given(MetricTemporalLogicStrategy)
+def test_hash_inheritance(phi):
+    assert hash(repr(phi)) == hash(phi)
+
+
+def test_sugar_smoke():
+    mtl.parse('(x <-> x)')
+    mtl.parse('(x -> x)')
+    mtl.parse('(x ^ x)')