Update tests for new abs semantics.

See discussion at https://github.com/cython/cython/issues/1837

tests/run/builtin_abs.pyx

@@ -31,25 +31,38 @@ def py_abs(a):
     return abs(a)
 
 @cython.test_assert_path_exists("//ReturnStatNode//NameNode[@entry.name = 'abs']",
-                                "//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_int']")
+                                "//ReturnStatNode//NameNode[@entry.cname = 'abs']")
+def sub_abs(int a):
+    """
+    >>> sub_abs(5)
+    (-5, 95)
+    >>> sub_abs(105)
+    (-105, -5)
+    """
+    return -abs(a), 100 - abs(a)
+
+@cython.test_assert_path_exists("//ReturnStatNode//NameNode[@entry.name = 'abs']",
+                                "//ReturnStatNode//NameNode[@entry.cname = 'abs']")
 def int_abs(int a):
     """
     >>> int_abs(-5) == 5
     True
     >>> int_abs(-5.1) == 5
     True
-    >>> int_abs(-max_int-1) > 0
-    True
-    >>> int_abs(-max_int-1) == abs(-max_int-1)   or (max_int, int_abs(-max_int-1), abs(-max_int-1))
-    True
+    """
+#     >>> int_abs(-max_int-1) > 0
+#     True
+#     >>> int_abs(-max_int-1) == abs(-max_int-1)   or (max_int, int_abs(-max_int-1), abs(-max_int-1))
+#     True
+    """
     >>> int_abs(max_int) == abs(max_int)         or (max_int, int_abs(max_int), abs(max_int))
     True
     """
     return abs(a)
 
 @cython.test_assert_path_exists("//ReturnStatNode//NameNode[@entry.name = 'abs']")
-@cython.test_fail_if_path_exists("//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_int']",
-                                 "//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_long']")
+@cython.test_fail_if_path_exists("//ReturnStatNode//NameNode[@entry.cname = 'abs']",
+                                 "//ReturnStatNode//NameNode[@entry.cname = 'labs']")
 def uint_abs(unsigned int a):
     """
     >>> uint_abs(max_int) == abs(max_int)         or (max_int, uint_abs(max_int), abs(max_int))
@@ -58,29 +71,33 @@ def uint_abs(unsigned int a):
     return abs(a)
 
 @cython.test_assert_path_exists("//ReturnStatNode//NameNode[@entry.name = 'abs']",
-                                "//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_long']")
+                                "//ReturnStatNode//NameNode[@entry.cname = 'labs']")
 def long_abs(long a):
     """
     >>> long_abs(-5) == 5
     True
     >>> long_abs(-5.1) == 5
     True
-    >>> long_abs(-max_long-1) > 0
-    True
-    >>> long_abs(-max_long-1) == abs(-max_long-1)   or (max_long, long_abs(-max_long-1), abs(-max_long-1))
-    True
+    """
+#     >>> long_abs(-max_long-1) > 0
+#     True
+#     >>> long_abs(-max_long-1) == abs(-max_long-1)   or (max_long, long_abs(-max_long-1), abs(-max_long-1))
+#     True
+    """
     >>> long_abs(max_long) == abs(max_long)         or (max_long, long_abs(max_long), abs(max_long))
     True
     """
     return abs(a)
 
 @cython.test_assert_path_exists("//ReturnStatNode//NameNode[@entry.name = 'abs']")
-@cython.test_fail_if_path_exists("//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_int']",
-                                 "//ReturnStatNode//NameNode[@entry.cname = '__Pyx_abs_long']")
+@cython.test_fail_if_path_exists("//ReturnStatNode//NameNode[@entry.cname = 'abs']",
+                                 "//ReturnStatNode//NameNode[@entry.cname = 'labs']")
 def ulong_abs(unsigned long a):
     """
     >>> ulong_abs(max_long) == abs(max_long)         or (max_int, ulong_abs(max_long), abs(max_long))
     True
+    >>> ulong_abs(max_long + 5) == abs(max_long + 5)         or (max_long + 5, ulong_abs(max_long + 5), abs(max_long + 5))
+    True
     """
     return abs(a)
 
@@ -90,10 +107,12 @@ def long_long_abs(long long a):
     """
     >>> long_long_abs(-(2**33)) == 2**33
     True
-    >>> long_long_abs(-max_long_long-1) > 0
-    True
-    >>> long_long_abs(-max_long_long-1) == abs(-max_long_long-1)  or (max_long_long, long_long_abs(-max_long_long-1), abs(-max_long_long-1))
-    True
+    """
+#     >>> long_long_abs(-max_long_long-1) > 0
+#     True
+#     >>> long_long_abs(-max_long_long-1) == abs(-max_long_long-1)  or (max_long_long, long_long_abs(-max_long_long-1), abs(-max_long_long-1))
+#     True
+    """
     >>> long_long_abs(max_long_long) == abs(max_long_long)        or (max_long_long, long_long_abs(max_long_long), abs(max_long_long))
     True
     """