Add a probabilistic test

tests/test_measurement.py

@@ -2,9 +2,32 @@ from abp import GraphState
 from anders_briegel import graphsim
 
 def test_measurements():
+
+    # Test that measuring |0> in Z gives 0
+    g = GraphState([0])
+    assert g.measure(0, "pz") == 0, "Measuring |0> in Z gives 0"
+
+    # Test that measuring |1> in Z gives 1
     g = GraphState([0])
-    print g
-    assert all(g.measure(0, "pz") == 0 for i in range(100)), "Measuring |0> in Z gives 0"
+    g.act_local_rotation(0, "px")
+    assert g.measure(0, "pz") == 1, "Measuring |1> in Z gives 1"
+
+    # Test that measuring |+> in X gives 0
+    g = GraphState([0])
+    g.act_local_rotation(0, "hadamard")
+    assert g.measure(0, "px") == 0
+    assert g.measure(0, "px") == 0, "Measuring |+> in X gives 0"
+    g.act_local_rotation(0, "pz")
+    assert g.measure(0, "px") == 1, "Measuring |-> in X gives 1"
+
+    # Test random outcomes
+    ones = 0
+    for i in range(1000):
+        g = GraphState([0])
+        g.act_local_rotation(0, "hadamard")
+        ones += g.measure(0, "pz")
+    assert 400 < ones < 600, "This is a probabilistic test!"
+
 
 
 def test_z_measurement_against_ab():