Added test cases

Former-commit-id: c9ea2edfff

stormpy/tests/.gitignore

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+__pycache__

stormpy/tests/core/test_parse.py

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+import stormpy
+
+class TestParse:
+    def test_parse_program(self):
+        # Fix!!!
+        #s = stormpy.parse_program("../../examples/dtmc/die/die.pm")
+        pass

stormpy/tests/expressions/test_expressions.py

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+import stormpy
+from stormpy.expressions import expressions
+
+class TestExpressions:
+    def test_expression_manager(self):
+        manager = expressions.ExpressionManager
+
+    def test_expression(self):
+        expression = expressions.Expression

stormpy/tests/info/test_info.py

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+import stormpy
+from stormpy.info import info
+
+class TestInfo:
+    def test_version(self):
+        s = info.Version.short()
+        s = info.Version.long()
+        s = info.Version.build_info()

stormpy/tests/logic/test_formulas.py

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+import stormpy
+from stormpy.logic import logic
+
+class TestFormulas:
+    def test_formula(self):
+        formula = logic.Formula