include octal number formatting in fstring tests

tests/run/fstring.pyx

@@ -55,7 +55,7 @@ def format_c_numbers(signed char c, short s, int n, long l, float f, double d):
     >>> print(s3)
       12f
     >>> print(s4)
-    0C00C 3.14
+    0C014 3.14
 
     >>> s1, s2, s3, s4 = format_c_numbers(-123, -135, -12, -12312312, -2.3456, -3.1415926)
     >>> print(s1)
@@ -65,7 +65,7 @@ def format_c_numbers(signed char c, short s, int n, long l, float f, double d):
     >>> print(s3)
      -12f
     >>> print(s4)
-    -C-0C-3.14
+    -C-14-3.14
 
     """
     s1 = f"{c}{s:4}{l}{n}{f:.3}"
@@ -74,7 +74,7 @@ def format_c_numbers(signed char c, short s, int n, long l, float f, double d):
     assert isinstance(s2, unicode), type(s2)
     s3 = f"{n:-4}f"
     assert isinstance(s3, unicode), type(s3)
-    s4 = f"{n:02X}{n:03X}{d:5.3}"
+    s4 = f"{n:02X}{n:03o}{d:5.3}"
     assert isinstance(s4, unicode), type(s4)
     return s1, s2, s3, s4