Add tests for missed branches.

sparse/coo/core.py

@@ -205,7 +205,8 @@ def __init__(self, coords, data=None, shape=None, has_duplicates=True,
         else:
             dtype = np.uint8
         self.coords = self.coords.astype(dtype)
-        assert not self.shape or len(data) == self.coords.shape[1]
+        assert not self.shape or (len(data) == self.coords.shape[1] and
+                                  len(shape) == self.coords.shape[0])
 
         if not sorted:
             self._sort_indices()
@@ -397,7 +398,8 @@ def from_iter(cls, x, shape=None):
             coords = np.empty((ndim, 0), dtype=np.uint8)
             data = np.empty((0,))
 
-            return COO(coords, data, shape=(), sorted=True, has_duplicates=False)
+            return COO(coords, data, shape=() if shape is None else shape,
+                       sorted=True, has_duplicates=False)
 
         if not isinstance(x[0][0], Iterable):
             coords = np.stack(x[1], axis=0)

sparse/tests/test_coo.py

@@ -1524,3 +1524,13 @@ def test_invalid_shape_error():
 
     with pytest.raises(ValueError):
         COO(s, shape=(2, 3))
+
+
+def test_invalid_iterable_error():
+    with pytest.raises(ValueError):
+        x = [(3, 4, 5)]
+        COO.from_iter(x)
+
+    with pytest.raises(ValueError):
+        x = [((2.3, 4.5), 3.2)]
+        COO.from_iter(x)