extend cdef function kwargs tests to include functions from the libc standard declarations

tests/errors/e_cdef_keywords_T241.pyx

@@ -8,6 +8,12 @@ cdef class A:
     cdef some_method(self, x, y=1):
         pass
 
+from libc.string cimport strcmp
+
+cdef extern from "string.h":
+    char *strstr(char*, char*)
+
+
 # ok
 some_function(1, 2)
 some_function(1, y=2)
@@ -42,28 +48,56 @@ a.some_method(x=1, x=1)
 a.some_method(x=1, x=1, y=2)
 a.some_method(x=1, y=2, x=1)
 
+# ok
+strcmp("abc", "cde")
+strcmp("abc", S2="cde")
+strcmp(S1="abc", S2="cde")
+strcmp(S2="cde", S1="abc")
+
+# nok
+strcmp("abc", S1="cde")
+strcmp("abc", S2="cde", S1="cde")
+strcmp(S1="abc", S2="cde", S1="cde")
+strcmp(S2="cde", S1="abc", S2="cde")
+
+# ok
+strstr("abc", "abcdef")
+
+# nok
+strstr("abc", char="abcdef")
+strstr("abc", "abcdef", char="xyz")
+
 
 _ERRORS = u"""
-16:18: argument 'x' passed twice
-17:18: argument 'x' passed twice
-18:23: C function got unexpected keyword argument 'z'
-19:18: C function got unexpected keyword argument 'z'
-20:21: C function got unexpected keyword argument 'z'
-21:25: C function got unexpected keyword argument 'z'
-22:25: argument 'x' passed twice
-23:25: argument 'x' passed twice
-23:30: C function got unexpected keyword argument 'z'
-33:18: argument 'x' passed twice
-34:21: argument 'x' passed twice
-35:21: argument 'y' passed twice
-36:21: argument 'x' passed twice
-36:26: argument 'y' passed twice
-37:21: argument 'y' passed twice
-37:26: argument 'x' passed twice
-38:23: argument 'x' passed twice
-39:21: C function got unexpected keyword argument 'z'
-40:23: C function got unexpected keyword argument 'z'
-41:20: argument 'x' passed twice
-42:20: argument 'x' passed twice
-43:25: argument 'x' passed twice
+22:18: argument 'x' passed twice
+23:18: argument 'x' passed twice
+24:23: C function got unexpected keyword argument 'z'
+25:18: C function got unexpected keyword argument 'z'
+26:21: C function got unexpected keyword argument 'z'
+27:25: C function got unexpected keyword argument 'z'
+28:25: argument 'x' passed twice
+29:25: argument 'x' passed twice
+29:30: C function got unexpected keyword argument 'z'
+
+39:18: argument 'x' passed twice
+40:21: argument 'x' passed twice
+41:21: argument 'y' passed twice
+42:21: argument 'x' passed twice
+42:26: argument 'y' passed twice
+43:21: argument 'y' passed twice
+43:26: argument 'x' passed twice
+44:23: argument 'x' passed twice
+45:21: C function got unexpected keyword argument 'z'
+46:23: C function got unexpected keyword argument 'z'
+47:20: argument 'x' passed twice
+48:20: argument 'x' passed twice
+49:25: argument 'x' passed twice
+
+58:16: argument 'S1' passed twice
+59:26: argument 'S1' passed twice
+60:29: argument 'S1' passed twice
+61:29: argument 'S2' passed twice
+
+67:18: C function got unexpected keyword argument 'char'
+68:28: C function got unexpected keyword argument 'char'
 """

tests/run/simplify_calls.pyx

 cimport cython
 
+from libc.string cimport strstr
+
 cdef cfunc(a,b,c,d):
     return (a,b,c,d)
 
@@ -76,8 +78,8 @@ def cpfunc_some_keywords():
     return cpfunc(1, 2, c=3, d=4)
 
 
-#@cython.test_fail_if_path_exists('//GeneralCallNode')
-#@cython.test_assert_path_exists('//SimpleCallNode')
+@cython.test_fail_if_path_exists('//GeneralCallNode')
+@cython.test_assert_path_exists('//SimpleCallNode')
 def cpfunc_some_keywords_unordered():
     """
     >>> cpfunc_some_keywords_unordered()
@@ -86,8 +88,8 @@ def cpfunc_some_keywords_unordered():
     return cpfunc(1, 2, d=4, c=3)
 
 
-#@cython.test_fail_if_path_exists('//GeneralCallNode')
-#@cython.test_assert_path_exists('//SimpleCallNode')
+@cython.test_fail_if_path_exists('//GeneralCallNode')
+@cython.test_assert_path_exists('//SimpleCallNode')
 def cpfunc_some_keywords_unordered_sideeffect():
     """
     >>> del sideeffect[:]
@@ -97,3 +99,19 @@ def cpfunc_some_keywords_unordered_sideeffect():
     [4, 3]
     """
     return cpfunc(1, 2, d=side_effect(4), c=side_effect(3))
+
+
+@cython.test_fail_if_path_exists('//GeneralCallNode')
+@cython.test_assert_path_exists('//SimpleCallNode')
+def libc_strstr():
+    """
+    >>> libc_strstr()
+    (True, True, True, True, True)
+    """
+    return (
+        strstr("xabcy", "abc") is not NULL,
+        strstr("abc", "xabcy") is NULL,
+        strstr(NEEDLE="abc", HAYSTACK="xabcz") is not NULL,
+        strstr(NEEDLE="xabcz", HAYSTACK="abc") is NULL,
+        strstr(HAYSTACK="abc", NEEDLE="xabcz") is NULL,
+        )