diff --git a/lib/spack/spack/test/cmd/mirror.py b/lib/spack/spack/test/cmd/mirror.py
index 6669168bbfa..3918849b0bc 100644
--- a/lib/spack/spack/test/cmd/mirror.py
+++ b/lib/spack/spack/test/cmd/mirror.py
@@ -583,6 +583,14 @@ def test_mirror_add_filters(mutable_config, tmpdir):
     mirror("add", "--exclude-specs", "foo", "example", "http://example.com")
     assert spack.config.get("mirrors:example") == {"url": "http://example.com", "exclude": ["foo"]}
     mirror("set", "--include-specs", "+shared", "example")
-    assert spack.config.get("mirrors:example") == {"url": "http://example.com", "exclude": ["foo"], "include": ["+shared"]}
-    mirror("set", "--include-file", include_path,"--exclude-file", exclude_path, "example")
-    assert spack.config.get("mirrors:example") == {"url": "http://example.com", "exclude": ["mpich@3.0.1:3.0.2", "mpich@1.0"], "include": ["build_type=Debug", "gcc-runtime"]}
+    assert spack.config.get("mirrors:example") == {
+        "url": "http://example.com",
+        "exclude": ["foo"],
+        "include": ["+shared"],
+    }
+    mirror("set", "--include-file", include_path, "--exclude-file", exclude_path, "example")
+    assert spack.config.get("mirrors:example") == {
+        "url": "http://example.com",
+        "exclude": ["mpich@3.0.1:3.0.2", "mpich@1.0"],
+        "include": ["build_type=Debug", "gcc-runtime"],
+    }