add tests using hypothesis

code/tests/test_energy_using_hypothesis.py

@@ -0,0 +1,12 @@
+import numpy as np
+from hypothesis import given
+from hypothesis import strategies as st
+from hypothesis.extra import numpy as hnp
+
+from MCFF.ising_model import energy, energy_numpy
+
+@given(hnp.arrays(dtype = int,
+                 shape = hnp.array_shapes(min_dims = 2, max_dims = 2),
+                 elements = st.sampled_from([1, -1])))
+def test_generated_states(state):
+    assert np.allclose(energy(state), energy_numpy(state))