1 files changed, 104 insertions, 0 deletions
diff --git a/tests/run/cascmp.pyx b/tests/run/cascmp.pyx
new file mode 100644
index 000000000..600cf3d85
--- /dev/null
+++ b/tests/run/cascmp.pyx
@@ -0,0 +1,104 @@
+# mode: run
+# tag: cascade, compare
+
+def ints_and_objects():
+    """
+    >>> ints_and_objects()
+    (0, 1, 0, 1, 1, 0)
+    """
+    cdef int int1=0, int2=0, int3=0, int4=0
+    cdef int r1, r2, r3, r4, r5, r6
+    cdef object obj1, obj2, obj3, obj4
+    obj1 = 1
+    obj2 = 2
+    obj3 = 3
+    obj4 = 4
+    r1 = int1 < int2 < int3
+    r2 = obj1 < obj2 < obj3
+    r3 = int1 < int2 < obj3
+    r4 = obj1 < 2 < 3
+    r5 = obj1 < 2 < 3 < 4
+    r6 = int1 < (int2 == int3) < int4
+    return r1, r2, r3, r4, r5, r6
+
+
+def const_cascade(x):
+    """
+    >>> const_cascade(2)
+    (True, False, True, False, False, True, False)
+    """
+    return (
+        0 <= 1,
+        1 <= 0,
+        1 <= 1 <= 2,
+        1 <= 0 < 1,
+        1 <= 1 <= 0,
+        1 <= 1 <= x <= 2 <= 3 > x <= 2 <= 2,
+        1 <= 1 <= x <= 1 <= 1 <= x <= 2,
+    )
+
+def eq_if_statement(a, b, c):
+    """
+    >>> eq_if_statement(1, 2, 3)
+    False
+    >>> eq_if_statement(2, 3, 4)
+    False
+    >>> eq_if_statement(1, 1, 2)
+    False
+    >>> eq_if_statement(1, "not an int", 2)
+    False
+    >>> eq_if_statement(2, 1, 1)
+    False
+    >>> eq_if_statement(1, 1, 1)
+    True
+    """
+    if 1 == a == b == c:
+        return True
+    else:
+        return False
+
+def eq_if_statement_semi_optimized(a, int b, int c):
+    """
+    Some but not all of the cascade ends up optimized
+    (probably not as much as should be). The test is mostly
+    that it keeps the types consistent throughout
+
+    >>> eq_if_statement_semi_optimized(1, 2, 3)
+    False
+    >>> eq_if_statement_semi_optimized(2, 3, 4)
+    False
+    >>> eq_if_statement_semi_optimized(1, 1, 2)
+    False
+    >>> eq_if_statement_semi_optimized("not an int", 1, 2)
+    False
+    >>> eq_if_statement_semi_optimized(2, 1, 1)
+    False
+    >>> eq_if_statement_semi_optimized(1, 1, 1)
+    True
+    """
+    if 1 == a == b == c == 1:
+        return True
+    else:
+        return False
+
+def eq_if_statement_semi_optimized2(a, b, c):
+    """
+    Here only "b==c" fails to optimize
+
+    >>> eq_if_statement_semi_optimized2(1, 2, 3)
+    False
+    >>> eq_if_statement_semi_optimized2(2, 3, 4)
+    False
+    >>> eq_if_statement_semi_optimized2(1, 1, 2)
+    False
+    >>> eq_if_statement_semi_optimized2(1, "not an int", 2)
+    False
+    >>> eq_if_statement_semi_optimized2(2, 1, 1)
+    False
+    >>> eq_if_statement_semi_optimized2(1, 1, 1)
+    True
+    """
+    if 1 == a == 1 == b == c:
+        return True
+    else:
+        return False