Add 100% test coverage

Closes #57

data/flat_triangular_mesh_no_target.txt

@@ -1,121 +1,121 @@
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gdist.pyx

@@ -170,7 +170,7 @@ def compute_gdist(numpy.ndarray[numpy.float64_t, ndim=2] vertices,
     cdef vector[unsigned] faces
 
     if source_indices is None:
-        source_indices = numpy.arange(0, dtype=numpy.int32)  # default to 0
+        source_indices = numpy.arange(1, dtype=numpy.int32)  # default to 0
     if target_indices is None:
         propagate_on_max_distance = True
         target_indices = numpy.arange(vertices.shape[0], dtype=numpy.int32)

tests/test_gdist.py

@@ -75,7 +75,7 @@ def test_flat_triangular_mesh_no_target(self):
         data = np.loadtxt("data/flat_triangular_mesh.txt", skiprows=1)
         vertices = data[0:121].astype(np.float64)
         triangles = data[121:].astype(np.int32)
-        source = np.array([2], dtype=np.int32)
+        source = None
         target = None
         distance = gdist.compute_gdist(
             vertices,