diff --git a/generate_tests.py b/generate_tests.py
index 49a24792b..7af1d2f0c 100644
--- a/generate_tests.py
+++ b/generate_tests.py
@@ -26,12 +26,21 @@ class CompiledPattern:
 for k, v in re.RegexFlag.__members__.items():
     setattr(CompiledPattern, k, v)
 
+
+# matches `// pattern {varname} = re.compile(...)`
+pattern_pattern = re.compile(r"^((\s*)\/\/\s*pattern\s+(\w+)\s+=\s+(.+?))$(?:.+?END GENERATED)?", re.M | re.S)
+def replace_compiled(m):
+    line, indent, varname, pattern = m.groups()
+    pattern = eval(pattern, {"re": CompiledPattern})
+    pattern = f"Pattern {{ code: &{json.dumps(pattern.code)}, flags: SreFlag::from_bits_truncate({int(pattern.flags)}) }}"
+    return f'''{line}
+{indent}// START GENERATED by generate_tests.py
+{indent}#[rustfmt::skip] let {varname} = {pattern};
+{indent}// END GENERATED'''
+
 with os.scandir("tests") as d:
     for f in d:
         path = Path(f.path)
-        if path.suffix == ".py":
-            pattern = eval(path.read_text(), {"re": CompiledPattern})
-            path.with_suffix(".re").write_text(
-                f"// {pattern.pattern!r}, flags={pattern.flags!r}\n"
-                f"Pattern {{ code: &{json.dumps(pattern.code)}, flags: SreFlag::from_bits_truncate({int(pattern.flags)}) }}"
-            )
+        if path.suffix == ".rs":
+            replaced = pattern_pattern.sub(replace_compiled, path.read_text())
+            path.write_text(replaced)
diff --git a/tests/lookbehind.py b/tests/lookbehind.py
deleted file mode 100644
index 3da642595..000000000
--- a/tests/lookbehind.py
+++ /dev/null
@@ -1 +0,0 @@
-re.compile(r'(?<!\.)x\b')
diff --git a/tests/lookbehind.re b/tests/lookbehind.re
deleted file mode 100644
index a0293c1c4..000000000
--- a/tests/lookbehind.re
+++ /dev/null
@@ -1,2 +0,0 @@
-// '(?<!\\.)x\\b', flags=re.UNICODE
-Pattern { code: &[15, 4, 0, 1, 1, 5, 5, 1, 17, 46, 1, 17, 120, 6, 10, 1], flags: SreFlag::from_bits_truncate(32) }
\ No newline at end of file
diff --git a/tests/positive_lookbehind.py b/tests/positive_lookbehind.py
deleted file mode 100644
index 2a0ab2925..000000000
--- a/tests/positive_lookbehind.py
+++ /dev/null
@@ -1 +0,0 @@
-re.compile(r'(?<=abc)def')
\ No newline at end of file
diff --git a/tests/positive_lookbehind.re b/tests/positive_lookbehind.re
deleted file mode 100644
index 68923b58e..000000000
--- a/tests/positive_lookbehind.re
+++ /dev/null
@@ -1,2 +0,0 @@
-// '(?<=abc)def', flags=re.UNICODE
-Pattern { code: &[15, 4, 0, 3, 3, 4, 9, 3, 17, 97, 17, 98, 17, 99, 1, 17, 100, 17, 101, 17, 102, 1], flags: SreFlag::from_bits_truncate(32) }
\ No newline at end of file
diff --git a/tests/tests.rs b/tests/tests.rs
index 8a18b5f33..f4cd091f0 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -18,18 +18,22 @@ impl Pattern {
 
 #[test]
 fn test_2427() {
-    // r'(?<!\.)x\b'
-    let pattern = include!("lookbehind.re");
-    let mut state = pattern.state("x", 0..usize::MAX);
+    // pattern lookbehind = re.compile(r'(?<!\.)x\b')
+    // START GENERATED by generate_tests.py
+    #[rustfmt::skip] let lookbehind = Pattern { code: &[15, 4, 0, 1, 1, 5, 5, 1, 17, 46, 1, 17, 120, 6, 10, 1], flags: SreFlag::from_bits_truncate(32) };
+    // END GENERATED
+    let mut state = lookbehind.state("x", 0..usize::MAX);
     state = state.pymatch();
     assert!(state.has_matched == Some(true));
 }
 
 #[test]
 fn test_assert() {
-    // '(?<=abc)def', flags=re.UNICODE
-    let pattern = include!("positive_lookbehind.re");
-    let mut state = pattern.state("abcdef", 0..usize::MAX);
+    // pattern positive_lookbehind = re.compile(r'(?<=abc)def')
+    // START GENERATED by generate_tests.py
+    #[rustfmt::skip] let positive_lookbehind = Pattern { code: &[15, 4, 0, 3, 3, 4, 9, 3, 17, 97, 17, 98, 17, 99, 1, 17, 100, 17, 101, 17, 102, 1], flags: SreFlag::from_bits_truncate(32) };
+    // END GENERATED
+    let mut state = positive_lookbehind.state("abcdef", 0..usize::MAX);
     state = state.search();
     assert!(state.has_matched == Some(true));
 }