tests/basics: Split f-string debug printing to separate file with .exp.

This feature {x=} was introduced in Python 3.8 so needs a separate .exp
file to run on earlier Python versions.

See https://bugs.python.org/issue36817

Signed-off-by: Damien George <damien@micropython.org>

tests/basics/string_fstring.py

@@ -12,17 +12,11 @@ print(f"""no interpolation""")
 x, y = 1, 2
 print(f'{x}')
 print(f'{x:08x}')
-print(f'{x=}')
-print(f'{x=:08x}')
 print(f'a {x} b {y} c')
 print(f'a {x:08x} b {y} c')
-print(f'a {x=} b {y} c')
-print(f'a {x=:08x} b {y} c')
 
 print(f'a {"hello"} b')
 print(f'a {f() + g("foo") + h()} b')
-print(f'a {f() + g("foo") + h()=} b')
-print(f'a {f() + g("foo") + h()=:08x} b')
 
 def foo(a, b):
     return f'{x}{y}{a}{b}'

tests/basics/string_fstring_debug.py

@@ -0,0 +1,23 @@
+# test f-string debug feature {x=}
+
+
+def f():
+    return 4
+
+
+def g(_):
+    return 5
+
+
+def h():
+    return 6
+
+
+x, y = 1, 2
+print(f"{x=}")
+print(f"{x=:08x}")
+print(f"a {x=} b {y} c")
+print(f"a {x=:08x} b {y} c")
+
+print(f'a {f() + g("foo") + h()=} b')
+print(f'a {f() + g("foo") + h()=:08x} b')

tests/basics/string_fstring_debug.py.exp

@@ -0,0 +1,6 @@
+x=1
+x=00000001
+a x=1 b 2 c
+a x=00000001 b 2 c
+a f() + g("foo") + h()=15 b
+a f() + g("foo") + h()=0000000f b

tools/tinytest-codegen.py

@@ -101,6 +101,7 @@ exclude_tests = (
     "misc/sys_settrace_features.py",
     # don't have f-string
     "basics/string_fstring.py",
+    "basics/string_fstring_debug.py",
 )
 
 output = []