[unittest] Added slicing tests

Author: cmastalli

unittest/python/test_std_vector.py

@@ -98,3 +98,12 @@ def checkZero(v):
 # Test mutable __getitem__
 l5[0][:] = 0.0
 assert np.allclose(l5[0], 0.0)
+
+# Test slicing
+l6 = eigenpy.StdVec_VectorXd()
+for _ in range(4):
+    l6.append(np.random.randn(3))
+checkAllValues(l6[:1], l6.tolist()[:1])
+checkAllValues(l6[1:], l6.tolist()[1:])
+checkAllValues(l6[:-1], l6.tolist()[:-1])
+checkAllValues(l6[::2], l6.tolist()[::2])