diff --git a/prometheuspvesd/test/unit/test_discovery.py b/prometheuspvesd/test/unit/test_discovery.py
index eaa4f38..26696ce 100644
--- a/prometheuspvesd/test/unit/test_discovery.py
+++ b/prometheuspvesd/test/unit/test_discovery.py
@@ -50,39 +50,29 @@ def test_exclude_tags(discovery, qemus):
     assert len(filtered) == 2
 
 
-def test_include_tags(discovery, qemus):
-    discovery.config.config["include_tags"] = ["monitored"]
+@pytest.mark.parametrize(
+    "testinput,expected", [
+        (["monitored"], 1),
+        (["monitored", "postgres"], 2),
+        ([], 3),
+    ]
+)
+def test_include_tags(discovery, qemus, testinput, expected):
+    discovery.config.config["include_tags"] = testinput
     filtered = discovery._filter(qemus)
 
-    assert len(filtered) == 1
+    assert len(filtered) == expected
 
 
-def test_include_tags_multiple(discovery, qemus):
-    discovery.config.config["include_tags"] = ["monitored", "postgres"]
+@pytest.mark.parametrize("testinput,expected", [
+    (["101", "100"], 2),
+    ([], 3),
+])
+def test_include_vmid(discovery, qemus, testinput, expected):
+    discovery.config.config["include_vmid"] = testinput
     filtered = discovery._filter(qemus)
 
-    assert len(filtered) == 2
-
-
-def test_include_tags_empty(discovery, qemus):
-    discovery.config.config["include_tags"] = []
-    filtered = discovery._filter(qemus)
-
-    assert len(filtered) == 3
-
-
-def test_include_vmid(discovery, qemus):
-    discovery.config.config["include_vmid"] = ["101", "100"]
-    filtered = discovery._filter(qemus)
-
-    assert len(filtered) == 2
-
-
-def test_include_vmid_empty(discovery, qemus):
-    discovery.config.config["include_vmid"] = []
-    filtered = discovery._filter(qemus)
-
-    assert len(filtered) == 3
+    assert len(filtered) == expected
 
 
 def test_include_and_exclude_tags(discovery, qemus):