new (partial) test case for ticket #582

tests/run/charptr_comparison_T582.pyx

+
+cimport cython
+
+@cython.test_assert_path_exists('//SingleAssignmentNode')
+#FIXME: optimise me!
+#@cython.test_fail_if_path_exists('//SingleAssignmentNode//CoerceFromPyTypeNode')
+def slice_equals_literal(char* s):
+    """
+    >>> slice_equals_literal('abc'.encode('ASCII'))
+    True
+    >>> slice_equals_literal('aabc'.encode('ASCII'))
+    False
+    >>> slice_equals_literal('abcx'.encode('ASCII'))
+    True
+    >>> slice_equals_literal('bcx'.encode('ASCII'))
+    False
+    """
+    cdef bint result = (s[:3] == b"abc")
+    return result
+
+def slice_gt_literal(char* s):
+    """
+    >>> slice_gt_literal('abc'.encode('ASCII'))
+    False
+    >>> slice_gt_literal('aabc'.encode('ASCII'))
+    False
+    >>> slice_gt_literal('abcx'.encode('ASCII'))
+    False
+    >>> slice_gt_literal('bcx'.encode('ASCII'))
+    True
+    """
+    cdef bint result = (s[:3] > b"abc")
+    return result
+
+def slice_lt_literal(char* s):
+    """
+    >>> slice_lt_literal('abc'.encode('ASCII'))
+    False
+    >>> slice_lt_literal('aabc'.encode('ASCII'))
+    True
+    >>> slice_lt_literal('abcx'.encode('ASCII'))
+    False
+    >>> slice_lt_literal('bcx'.encode('ASCII'))
+    False
+    """
+    cdef bint result = (s[:3] < b"abc")
+    return result
+
+def slice_ge_literal(char* s):
+    """
+    >>> slice_ge_literal('abc'.encode('ASCII'))
+    True
+    >>> slice_ge_literal('aabc'.encode('ASCII'))
+    False
+    >>> slice_ge_literal('abcx'.encode('ASCII'))
+    True
+    >>> slice_ge_literal('bcx'.encode('ASCII'))
+    True
+    """
+    cdef bint result = (s[:3] >= b"abc")
+    return result
+
+def slice_le_literal(char* s):
+    """
+    >>> slice_le_literal('abc'.encode('ASCII'))
+    True
+    >>> slice_le_literal('aabc'.encode('ASCII'))
+    True
+    >>> slice_le_literal('abcx'.encode('ASCII'))
+    True
+    >>> slice_le_literal('bcx'.encode('ASCII'))
+    False
+    """
+    cdef bint result = (s[:3] <= b"abc")
+    return result