use unicode strings for compiler error tests (just for consistency)

tests/errors/cdefoptargs.pyx

@@ -4,6 +4,6 @@ def call5():
 cdef b(a, b, c=1, d=2):
     pass
 
-_ERRORS = """
+_ERRORS = u"""
 2:5:Call with wrong number of arguments (expected at most 4, got 5)
 """

tests/errors/e_pxdimpl.pyx

 cimport e_pxdimpl_imported
 
-_ERRORS = """
+_ERRORS = u"""
 6:4:  function definition not allowed here
 18:4: function definition not allowed here
 23:8: function definition not allowed here

tests/errors/e_strcoerce.pyx

@@ -2,7 +2,7 @@ cdef int c1 = "t"     # works
 cdef int c2 = "te"    # fails
 cdef int cx = "test"  # fails
 
-_ERRORS = """
+_ERRORS = u"""
 2:14: Only coerce single-character ascii strings can be used as ints.
 3:14: Only coerce single-character ascii strings can be used as ints.
 """

tests/errors/e_switch.pyx

@@ -7,6 +7,6 @@ elif x == 2:
 elif x == 4:
     print 34
 
-_ERRORS = """
+_ERRORS = u"""
 3:19: undeclared name not builtin: NONEXISTING
 """

tests/errors/encoding.pyx

@@ -4,6 +4,6 @@
 Trs bien. 
 """
 
-_ERRORS = """
+_ERRORS = u"""
 0:0:Decoding error, missing or incorrect coding=<encoding-name> at top of source ('ascii' codec can't decode byte 0x8f in position 22: ordinal not in range(128))
 """

tests/errors/futurebraces.pyx

 from __future__ import braces
 
-_ERRORS = """
+_ERRORS = u"""
 1:23: not a chance
 """

tests/errors/invalid_cast.pyx

 def f():
     a = <foao>True
 
-_ERRORS = """
+_ERRORS = u"""
 2:9: 'foao' is not a type identifier
 """

tests/errors/undefinedname.pyx

@@ -3,7 +3,7 @@ i = _this_global_name_does_not_exist_
 def test(i):
     return _this_local_name_does_not_exist_
 
-_ERRORS = """
+_ERRORS = u"""
 1:37:undeclared name not builtin: _this_global_name_does_not_exist_
 4:43:undeclared name not builtin: _this_local_name_does_not_exist_
 """

tests/errors/void_as_arg.pyx

 cdef extern from *:
     void foo(void)
 
-_ERRORS = """
+_ERRORS = u"""
 2:13:Use spam() rather than spam(void) to declare a function with no arguments.
 """