add tests

test/test_data.py

@@ -65,6 +65,11 @@ def test_badstring_rank_threshold():
     build_graph(data, n_pca=True, rank_threshold='foobar')
 
 
+@raises(ValueError)
+def test_negative_rank_threshold():
+    build_graph(data, n_pca=True, rank_threshold=-1)
+
+
 @raises(ValueError)
 @warns(RuntimeWarning)
 def test_True_n_pca_large_threshold():

test/test_knn.py

@@ -380,6 +380,14 @@ def test_shortest_path_precomputed_no_decay_data():
     G.shortest_path(distance='data')
 
 
+@raises(ValueError)
+def test_shortest_path_invalid():
+    data_small = data[np.random.choice(
+        len(data), len(data) // 4, replace=False)]
+    G = build_graph(data_small, knn=5, decay=None)
+    G.shortest_path(distance='invalid')
+
+
 ####################
 # Test API
 ####################

test/test_mnn.py

@@ -116,6 +116,16 @@ def test_mnn_with_kernel_symm_gamma():
         theta=0.9)
 
 
+@raises(ValueError)
+def test_mnn_with_kernel_symm_invalid():
+    build_graph(
+        data, thresh=0, n_pca=20,
+        decay=10, knn=5, random_state=42,
+        sample_idx=digits['target'],
+        kernel_symm='invalid',
+        theta=0.9)
+
+
 @warns(FutureWarning)
 def test_mnn_with_kernel_symm_theta():
     build_graph(