diff --git a/setup.py b/setup.py
index 3802e2f..c5c58a1 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
     version="1.6",
     description="Display dependency tree of Python distribution",
     long_description=open("README.md").read(),
-    long_description_content_type='text/markdown',
+    long_description_content_type="text/markdown",
     packages=["johnnydep"],
     author="Wim Glenn",
     author_email="hey@wimglenn.com",
diff --git a/tests/test_lib.py b/tests/test_lib.py
index 7dae19a..0a3eaee 100644
--- a/tests/test_lib.py
+++ b/tests/test_lib.py
@@ -481,7 +481,7 @@ def test_get_caching(make_dist, mocker):
     ]
 
 
-def test_extras_parsing(make_dist, mocker):
+def test_extras_parsing(make_dist):
     make_dist(name="parent", install_requires=['child; extra == "foo" or extra == "bar"'])
     make_dist(name="child")
     assert JohnnyDist("parent").requires == []
@@ -491,11 +491,16 @@ def test_extras_parsing(make_dist, mocker):
     assert JohnnyDist("parent[baz,foo]").requires == ["child"]
 
 
-def test_license_parsing_metadaa(make_dist, mocker):
+def test_license_parsing_metadaa(make_dist):
     make_dist(license="The License")
     assert JohnnyDist("jdtest").license == "The License"
 
 
-def test_license_parsing_classifiers(make_dist, mocker):
-    make_dist(license="", classifiers=["License :: OSI Approved :: MIT License"])
+def test_license_parsing_classifiers(make_dist):
+    make_dist(license="", classifiers=["blah", "License :: OSI Approved :: MIT License"])
     assert JohnnyDist("jdtest").license == "MIT License"
+
+
+def test_license_parsing_unknown(make_dist):
+    make_dist(license="")
+    assert JohnnyDist("jdtest").license == ""