diff --git a/raster/r.clump/tests/test_clump.py b/raster/r.clump/tests/test_clump.py
new file mode 100644
index 00000000000..a552fc6c4bd
--- /dev/null
+++ b/raster/r.clump/tests/test_clump.py
@@ -0,0 +1,70 @@
+import pytest
+from grass.script import run_command, read_command, parse_command
+
+
+@pytest.fixture(scope="module")
+def setup_map():
+    """Set up a temporary region and generate a clumped map."""
+    # Set the region
+    run_command("g.region", n=3, s=0, e=3, w=0, res=1)
+
+    # Create the custom map
+    #  5   null null
+    # null  5   null
+    # null  6    6
+    run_command(
+        "r.mapcalc",
+        expression=(
+            "custom_map = "
+            "if(row() == 1 && col() == 1, 5, "
+            "if(row() == 2 && col() == 2, 5, "
+            "if(row() == 3 && col() >= 2, 6, null())))"
+        ),
+        overwrite=True,
+    )
+    yield
+
+    # Teardown: Remove maps
+    run_command(
+        "g.remove", flags="f", type="raster", name=["custom_map", "clumped_map"]
+    )
+
+
+def test_clump_basic(setup_map):
+    """Test basic clumped map."""
+
+    run_command("r.clump", input="custom_map", output="clumped_map", overwrite=True)
+
+    output_maps = parse_command("g.list", type="raster")
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = read_command("r.category", map="clumped_map").strip().split("\n")
+    actual_categories = {
+        int(line.split("\t")[0]): line.split("\t")[1].strip() if "\t" in line else ""
+        for line in category_output
+    }
+
+    expected_categories = {1: "", 2: "", 3: ""}
+
+    assert set(actual_categories.keys()) == set(expected_categories.keys())
+
+
+def test_clump_diagonal(setup_map):
+    """Test clumped map with diagonal connectivity."""
+
+    run_command(
+        "r.clump", input="custom_map", output="clumped_map", flags="d", overwrite=True
+    )
+
+    output_maps = parse_command("g.list", type="raster")
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = read_command("r.category", map="clumped_map").strip().split("\n")
+    actual_categories = {
+        int(line.split("\t")[0]): line.split("\t")[1].strip() if "\t" in line else ""
+        for line in category_output
+    }
+
+    expected_categories = {1: "", 2: ""}
+
+    assert set(actual_categories.keys()) == set(expected_categories.keys())