diff --git a/docs/checks.md b/docs/checks.md
index e48b1e7..ef7178d 100644
--- a/docs/checks.md
+++ b/docs/checks.md
@@ -601,7 +601,7 @@ if x == y and x == z:
 
 # and
 
-if x is None and y is None
+if x is None and y is None:
     pass
 ```
 
@@ -2150,7 +2150,7 @@ Bad:
 from hashlib import sha512
 
 h = sha512()
-h.update(b"data)
+h.update(b"data")
 ```
 
 Good:
@@ -2172,7 +2172,7 @@ Bad:
 
 ```python
 nums = [123, 456]
-num = f"{num[0]}")
+num = f"{num[0]}"
 ```
 
 Good:
diff --git a/refurb/checks/hashlib/simplify_ctor.py b/refurb/checks/hashlib/simplify_ctor.py
index 390bc46..e8a279c 100644
--- a/refurb/checks/hashlib/simplify_ctor.py
+++ b/refurb/checks/hashlib/simplify_ctor.py
@@ -30,7 +30,7 @@ class ErrorInfo(Error):
     from hashlib import sha512
 
     h = sha512()
-    h.update(b"data)
+    h.update(b"data")
     ```
 
     Good:
diff --git a/refurb/checks/logical/use_equal_chain.py b/refurb/checks/logical/use_equal_chain.py
index 8e70710..a79d1e5 100644
--- a/refurb/checks/logical/use_equal_chain.py
+++ b/refurb/checks/logical/use_equal_chain.py
@@ -20,7 +20,7 @@ class ErrorInfo(Error):
 
     # and
 
-    if x is None and y is None
+    if x is None and y is None:
         pass
     ```
 
diff --git a/refurb/checks/readability/use_str_func.py b/refurb/checks/readability/use_str_func.py
index d8d5c85..7ef618b 100644
--- a/refurb/checks/readability/use_str_func.py
+++ b/refurb/checks/readability/use_str_func.py
@@ -18,7 +18,7 @@ class ErrorInfo(Error):
 
     ```
     nums = [123, 456]
-    num = f"{num[0]}")
+    num = f"{num[0]}"
     ```
 
     Good:
diff --git a/test/test_check_formatting.py b/test/test_check_formatting.py
index eefc90a..6a7a35d 100644
--- a/test/test_check_formatting.py
+++ b/test/test_check_formatting.py
@@ -1,6 +1,10 @@
+import ast
 import re
 from functools import cache
 from pathlib import Path
+from textwrap import dedent
+
+import pytest
 
 import refurb
 from refurb.error import Error
@@ -55,6 +59,26 @@ def get_categories_from_docs() -> list[str]:
         return categories
 
 
+def assert_python_snippets_are_parseable(error: type[Error]) -> None:
+    # This check is simple enough that it doesn't need detailed docs
+    if error.code == 105:
+        return
+
+    docs = dedent(error(0, 0, "").__doc__ or "")
+
+    groups = re.findall(r"```([\S\s]*?)```", docs)
+    assert groups, "Missing docstring"
+
+    assert len(groups) >= 2, 'Expected at least 2 "good" and "bad" code examples in docstring'
+
+    try:
+        for code in groups:
+            ast.parse(code.strip())
+
+    except SyntaxError as ex:
+        pytest.fail(f"Python code in docs is invalid: {ex.msg}")
+
+
 def test_checks_are_formatted_properly() -> None:
     error_names: set[str] = set()
 
@@ -68,6 +92,7 @@ def test_checks_are_formatted_properly() -> None:
             assert_category_exists(error)
             assert_categories_are_sorted(error)
             assert_categories_are_valid(error, get_categories_from_docs())
+            assert_python_snippets_are_parseable(error)
 
             assert error.name, "name field missing for class"