diff --git a/testdata/error.py b/testdata/error.py
new file mode 100644
index 0000000..fe66414
--- /dev/null
+++ b/testdata/error.py
@@ -0,0 +1,12 @@
+import os, sys  # Multiple imports on one line (E401)
+
+def foo():
+  print("Hello, world!")  # Print statement found (T201)
+
+def bar():
+  x = { 'a': 1, 'b': 2 }  # Whitespace inside braces (E201)
+  y = [1, 2, 3, ]  # Trailing comma in list (E231)
+  return x, y
+
+foo()
+bar()
\ No newline at end of file