1 files changed, 17 insertions, 0 deletions
diff --git a/tests/test_main.py b/tests/test_main.py
new file mode 100644
index 00000000..b3e50b54
--- /dev/null
+++ b/tests/test_main.py
@@ -0,0 +1,17 @@
+import os
+from isort import main
+
+
+def test_is_python_file(tmpdir):
+    assert main.is_python_file("file.py")
+    assert main.is_python_file("file.pyi")
+    assert main.is_python_file("file.pyx")
+    assert not main.is_python_file("file.pyc")
+    assert not main.is_python_file("file.txt")
+
+    fifo_file = os.path.join(tmpdir, "fifo_file")
+    os.mkfifo(fifo_file)
+    assert not main.is_python_file(fifo_file)
+
+
+