tests: increase coverage

cuvec/swigcuvec.py

@@ -184,8 +184,8 @@ def asarray(arr, dtype=None, order=None, ownership: str = 'warning') -> CuVec:
         Instead, use the `retarray` helper:
         >>> raw = some_swig_api_func(..., output=getattr(out, 'cuvec', None))
         >>> res = retarray(raw, out)
-        NB: `asarray()` is safe if the raw cuvec was created in C++/SWIG, e.g.:
-        >>> res = asarray(some_swig_api_func(..., output=None), ownership='debug')
+        NB: `asarray()`/`retarray()` are safe if the raw cuvec was created in C++/SWIG, e.g.:
+        >>> res = retarray(some_swig_api_func(..., output=None))
     """
     if is_raw_cuvec(arr):
         ownership = ownership.lower()

tests/test_swigcuvec.py

@@ -158,5 +158,12 @@ def test_increment():
     a[:] = 0
     assert (a == 0).all()
 
-    res = cu.asarray(increment2d_f(a.cuvec), ownership='debug')
-    assert (res == 1).all()
+    b = cu.retarray(increment2d_f(a.cuvec))
+    assert (b == 1).all()
+
+    c = cu.retarray(increment2d_f(b.cuvec, a.cuvec), a)
+    assert (a == 2).all()
+    assert c.cuvec == a.cuvec
+    assert (c == a).all()
+    assert str(c.swvec) == str(a.swvec)
+    assert np.asarray(c.swvec).data == np.asarray(a.swvec).data