diff --git a/tests/basics/string_fstring.py b/tests/basics/string_fstring.py
index efb7e5a8e..4f7225fca 100644
--- a/tests/basics/string_fstring.py
+++ b/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}'
diff --git a/tests/basics/string_fstring_debug.py b/tests/basics/string_fstring_debug.py
new file mode 100644
index 000000000..76a448ca0
--- /dev/null
+++ 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')
diff --git a/tests/basics/string_fstring_debug.py.exp b/tests/basics/string_fstring_debug.py.exp
new file mode 100644
index 000000000..563030f40
--- /dev/null
+++ 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
diff --git a/tools/tinytest-codegen.py b/tools/tinytest-codegen.py
index ddbe62b84..f1169a34d 100755
--- a/tools/tinytest-codegen.py
+++ 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 = []