diff --git a/testing/code/test_excinfo.py b/testing/code/test_excinfo.py
index 52d5286b8..6ee848e54 100644
--- a/testing/code/test_excinfo.py
+++ b/testing/code/test_excinfo.py
@@ -131,7 +131,7 @@ class TestTraceback_f_g_h:
             try:
                 raise ValueError
             except somenoname:  # type: ignore[name-defined] # noqa: F821
-                pass
+                pass  # pragma: no cover
 
         try:
             xyz()
@@ -475,7 +475,7 @@ class TestFormattedExcinfo:
         except BaseException:
             excinfo = _pytest._code.ExceptionInfo.from_current()
         else:
-            assert 0, "did not raise"
+            assert False, "did not raise"
 
         pr = FormattedExcinfo()
         source = pr._getentrysource(excinfo.traceback[-1])
diff --git a/testing/code/test_source.py b/testing/code/test_source.py
index ea5b7a4a5..4222eb172 100644
--- a/testing/code/test_source.py
+++ b/testing/code/test_source.py
@@ -56,7 +56,7 @@ def test_source_from_lines() -> None:
 
 def test_source_from_inner_function() -> None:
     def f():
-        pass
+        raise NotImplementedError()
 
     source = _pytest._code.Source(f)
     assert str(source).startswith("def f():")
@@ -245,15 +245,15 @@ def test_getline_finally() -> None:
 
 def test_getfuncsource_dynamic() -> None:
     def f():
-        raise ValueError
+        raise NotImplementedError()
 
     def g():
-        pass
+        pass  # pragma: no cover
 
     f_source = _pytest._code.Source(f)
     g_source = _pytest._code.Source(g)
-    assert str(f_source).strip() == "def f():\n    raise ValueError"
-    assert str(g_source).strip() == "def g():\n    pass"
+    assert str(f_source).strip() == "def f():\n    raise NotImplementedError()"
+    assert str(g_source).strip() == "def g():\n    pass  # pragma: no cover"
 
 
 def test_getfuncsource_with_multine_string() -> None: