Add unit tests for 'consume' operations

tests/run/cypclass_consume_refcount.pyx

+# mode: run
+# tag: cpp, cpp11, pthread
+# cython: experimental_cpp_class_def=True, language_level=2
+
+
+cdef cypclass Refcounted:
+    __dealloc__(self) with gil:
+        print("Refcounted destroyed")
+
+
+def test_consume_name():
+    """
+    >>> test_consume_name()
+    Refcounted destroyed
+    0
+    """
+    r0 = Refcounted()
+    if Cy_GETREF(r0) != 2:
+        return -1
+
+    cdef Refcounted r1 = consume r0
+    if r0 is not NULL:
+        return -2
+    if Cy_GETREF(r1) != 2:
+        return -3
+
+    return 0
+
+def test_consume_iso_name():
+    """
+    >>> test_consume_iso_name()
+    Refcounted destroyed
+    0
+    """
+    cdef iso Refcounted r0 = consume Refcounted()
+
+    cdef Refcounted r1 = consume r0
+    if r0 is not NULL:
+        return -2
+    if Cy_GETREF(r1) != 2:
+        return -3
+
+    return 0
+
+def test_consume_and_drop_name():
+    """
+    >>> test_consume_and_drop_name()
+    Refcounted destroyed
+    consumed
+    0
+    """
+    r = Refcounted()
+    if Cy_GETREF(r) != 2:
+        return -1
+
+    consume r
+    print("consumed")
+
+    if r is not NULL:
+        return -2
+
+    return 0
+
+def test_consume_constructed():
+    """
+    >>> test_consume_constructed()
+    Refcounted destroyed
+    0
+    """
+    cdef Refcounted r = consume Refcounted()
+    if Cy_GETREF(r) != 2:
+        return -1
+
+    return 0
+
+def test_consume_iso_constructed():
+    """
+    >>> test_consume_iso_constructed()
+    Refcounted destroyed
+    0
+    """
+    cdef Refcounted r = consume new Refcounted()
+    if Cy_GETREF(r) != 2:
+        return -1
+
+    return 0
+
+def test_consume_and_drop_constructed():
+    """
+    >>> test_consume_and_drop_constructed()
+    Refcounted destroyed
+    consumed
+    0
+    """
+    consume Refcounted()
+    print("consumed")
+
+    return 0
+
+cdef cypclass Origin:
+    Refcounted field
+
+    __init__(self):
+        self.field = Refcounted()
+
+cdef cypclass OriginIso:
+    iso Refcounted field
+
+    __init__(self):
+        self.field = consume Refcounted()
+
+def test_consume_field():
+    """
+    >>> test_consume_field()
+    Refcounted destroyed
+    0
+    """
+    cdef Refcounted r = consume Origin().field
+    if Cy_GETREF(r) != 2:
+        return -1
+
+    return 0
+
+def test_consume_iso_field():
+    """
+    >>> test_consume_iso_field()
+    Refcounted destroyed
+    0
+    """
+    cdef Refcounted r = consume OriginIso().field
+    if Cy_GETREF(r) != 2:
+        return -1
+
+    return 0
+
+def test_consume_and_drop_field():
+    """
+    >>> test_consume_and_drop_field()
+    Refcounted destroyed
+    consumed
+    0
+    """
+    consume Origin().field
+    print("consumed")
+
+    return 0