Simple test for ls op

tests/ops/ls/test_ls.py

@@ -0,0 +1,23 @@
+import os
+import tempfile
+
+from sarif.operations import ls_op
+
+
+def test_ls():
+    file_names = ["file1.sarif", "file2.sarif", "aaaa.sarif"]
+
+    with tempfile.TemporaryDirectory() as tmp:
+        for file_name in file_names:
+            with open(os.path.join(tmp, file_name), "wb") as f_in:
+                f_in.write("{}".encode())
+
+        output_path = os.path.join(tmp, "output.txt")
+        ls_op.print_ls([tmp], output_path)
+
+        with open(output_path, "rb") as f_out:
+            output = f_out.read().decode().splitlines()
+
+        assert len(output) == len(file_names) + 1
+        assert output[0] == tmp + ":"
+        assert output[1:] == sorted(["  " + file_name for file_name in file_names])