test: add base coverage for all functions

.coveragerc

@@ -1,6 +1,6 @@
 [run]
 source =
-    YOUR_SOURCE
+    checkcert
 omit =
     */__init__.py
 

checkcert/checkcert.py

@@ -38,4 +38,4 @@ def main(san, dump, port, expires, domain):
 
 
 if __name__ == "__main__":
-    main()
+    main()  # pragma: no cover

tests/test_checkcert.py

@@ -9,9 +9,21 @@ def test_main():
     if cert_main:
         response = runner.invoke(cert_main, ["www.franklin.edu"])
         assert response.exit_code == 0
+        response = runner.invoke(cert_main, ["www.franklin.edu:443"])
+        assert response.exit_code == 0
 
 
 def test_version():
     response = runner.invoke(cert_main, ["--version"])
     assert response.exit_code == 0
     assert cert_version in response.output
+
+
+def test_dump():
+    response = runner.invoke(cert_main, ["www.franklin.edu", "--dump"])
+    assert response.exit_code == 0
+
+
+def test_san():
+    response = runner.invoke(cert_main, ["www.franklin.edu", "--san"])
+    assert response.exit_code == 0