diff --git a/raster/r.clump/tests/conftest.py b/raster/r.clump/tests/conftest.py
new file mode 100644
index 00000000000..393bd31ba25
--- /dev/null
+++ b/raster/r.clump/tests/conftest.py
@@ -0,0 +1,50 @@
+import os
+import pytest
+import grass.script as gs
+
+
+@pytest.fixture
+def setup_maps(tmp_path):
+    """Set up a GRASS session and create test raster maps."""
+
+    # Initialize GRASS project
+    project = tmp_path / "r_clump_project"
+    gs.create_project(project)
+    with gs.setup.init(project, env=os.environ.copy()) as session:
+        # Set the region
+        gs.run_command(
+            "g.region",
+            n=3,
+            s=0,
+            e=3,
+            w=0,
+            res=1,
+            env=session.env,
+        )
+
+        gs.mapcalc(
+            "custom_map = "
+            "if(row() == 1 && col() == 1, 5, "
+            "if(row() == 1 && col() == 2, 5.5, "
+            "if(row() == 2 && col() == 2, 5, "
+            "if(row() == 3 && col() >= 2, 5.5, null()))))",
+            overwrite=True,
+            env=session.env,
+        )
+
+        gs.mapcalc(
+            "custom_map1 = "
+            "if(row() == 1 && col() == 1, 1, "
+            "if(row() == 1 && col() == 2, 2, "
+            "if(row() == 1 && col() == 3, 3, "
+            "if(row() == 2 && col() == 1, 4, "
+            "if(row() == 2 && col() == 2, 5, "
+            "if(row() == 2 && col() == 3, 6, "
+            "if(row() == 3 && col() == 1, 7, "
+            "if(row() == 3 && col() == 2, 8, "
+            "if(row() == 3 && col() == 3, 9, null())))))))))",
+            overwrite=True,
+            env=session.env,
+        )
+
+        yield session  # Pass the session to tests
diff --git a/raster/r.clump/tests/test_clump.py b/raster/r.clump/tests/test_clump.py
new file mode 100644
index 00000000000..c719a2a209f
--- /dev/null
+++ b/raster/r.clump/tests/test_clump.py
@@ -0,0 +1,117 @@
+import grass.script as gs
+
+
+def results_check(actual_categories, expected_categories):
+    # Test if keys match
+    assert set(actual_categories.keys()) == set(expected_categories.keys())
+
+    # Test to check if labels are empty
+    for key in expected_categories.keys():
+        assert actual_categories[key] == expected_categories[key]
+
+
+def test_clump_basic(setup_maps):
+    """Test basic clumped map."""
+    session = setup_maps
+    gs.run_command(
+        "r.clump",
+        input="custom_map",
+        output="clumped_map",
+        overwrite=True,
+        env=session.env,
+    )
+
+    output_maps = gs.parse_command("g.list", type="raster", env=session.env)
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = gs.parse_command("r.category", map="clumped_map", env=session.env)
+
+    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: "", 4: ""}
+
+    results_check(actual_categories, expected_categories)
+
+
+def test_clump_diagonal(setup_maps):
+    """Test clumped map with diagonal connectivity."""
+    session = setup_maps
+    gs.run_command(
+        "r.clump",
+        input="custom_map",
+        output="clumped_map",
+        flags="d",
+        overwrite=True,
+        env=session.env,
+    )
+
+    output_maps = gs.parse_command("g.list", type="raster", env=session.env)
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = gs.parse_command("r.category", map="clumped_map", env=session.env)
+
+    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: ""}
+
+    results_check(actual_categories, expected_categories)
+
+
+def test_clump_minsize(setup_maps):
+    """Test clumped map with minimum size parameter."""
+    session = setup_maps
+    gs.run_command(
+        "r.clump",
+        input="custom_map",
+        output="clumped_map",
+        minsize=2,
+        overwrite=True,
+        env=session.env,
+    )
+
+    output_maps = gs.parse_command("g.list", type="raster", env=session.env)
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = gs.parse_command("r.category", map="clumped_map", env=session.env)
+
+    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: ""}
+
+    results_check(actual_categories, expected_categories)
+
+
+def test_clump_threshold(setup_maps):
+    """Test clumped map with threshold parameter."""
+    session = setup_maps
+    gs.run_command(
+        "r.clump",
+        input="custom_map1",
+        output="clumped_map",
+        threshold=0.2,
+        overwrite=True,
+        env=session.env,
+    )
+
+    output_maps = gs.parse_command("g.list", type="raster", env=session.env)
+    assert "clumped_map" in output_maps, "Output raster map 'clumped_map' should exist"
+
+    category_output = gs.parse_command("r.category", map="clumped_map", env=session.env)
+
+    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: ""}
+
+    results_check(actual_categories, expected_categories)