diff --git a/tests/test_model_name_trimming.py b/tests/test_model_name_trimming.py
new file mode 100644
index 00000000..4d3fd57a
--- /dev/null
+++ b/tests/test_model_name_trimming.py
@@ -0,0 +1,13 @@
+import pytest
+
+def parse_model_tag(model: str) -> tuple[str, str]:
+    cleaned = model.strip()
+    if ":" in cleaned:
+        parts = cleaned.split(":", 1)
+        return parts[0].strip(), parts[1].strip()
+    return cleaned, "latest"
+
+def test_parse_model_tag():
+    assert parse_model_tag("llama3") == ("llama3", "latest")
+    assert parse_model_tag("mistral:7b") == ("mistral", "7b")
+    assert parse_model_tag("  qwen2.5:14b  ") == ("qwen2.5", "14b")