diff --git a/tests/test_frame_extraction.py b/tests/test_frame_extraction.py
new file mode 100644
index 00000000..76c144dc
--- /dev/null
+++ b/tests/test_frame_extraction.py
@@ -0,0 +1,104 @@
+from pathlib import Path
+import sys
+import subprocess
+
+
+script_path = (
+    Path(__file__).parent
+    / ".."
+    / "bboxes labelling"
+    / "extract_frames_to_label_w_sleap.py"
+)
+
+python_interpreter = sys.executable
+
+# TODO: add a very small sample clip!
+sample_input_video = (
+    Path(__file__).parent / "data" / "NINJAV_S001_S001_T003_subclip.mp4"
+)
+sample_input_dir = Path(__file__).parent / "data"
+# TODO: use a temp directory from pytest fixtures?
+sample_output_dir = Path(__file__).parent / "output"
+
+# TODO: have this as a fixture? or parametrise?
+sample_input_params = {
+    "output_path": sample_output_dir,
+    "video_extensions": "mp4",
+    "initial_samples": "5",
+    "scale": "0.5",
+    "n_components": "3",
+    "n_clusters": "5",
+    "per_cluster": "1",
+}
+
+
+def test_help():
+    result = subprocess.run(
+        [python_interpreter, script_path, "-h"],
+        capture_output=True,
+        # text=True
+    )
+    # result.args, result.returncode, result.stdout, result.stderr
+    assert result.returncode == 0
+
+
+def test_small_frame_extraction_one_video():
+    # TODO: can these be fixtures?
+    list_kys_modif = ["--" + k for k in sample_input_params.keys()]
+    list_non_bool_cli_args = [
+        val
+        for pair in zip(list_kys_modif, list(sample_input_params.values()))
+        for val in pair
+    ]
+    list_bool_cli_args = ["--compute_features_per_video"]
+    list_cli_args = list_non_bool_cli_args + list_bool_cli_args
+
+    result = subprocess.run(
+        [
+            python_interpreter,
+            script_path,
+            sample_input_video,
+        ]
+        + list_cli_args,
+        capture_output=True,
+        text=True,
+    )
+
+    # check return code
+    assert result.returncode == 0
+
+    # check one json file
+
+    # check n_elements in json file matches n of files generated
+
+    # check min number of files? (NOTE: total number of files is not deterministic!)
+
+    # check name of files
+
+
+def test_small_frame_extraction_one_dir():
+    # TODO: can these be fixtures?
+    list_kys_modif = ["--" + k for k in sample_input_params.keys()]
+    list_non_bool_cli_args = [
+        val
+        for pair in zip(list_kys_modif, list(sample_input_params.values()))
+        for val in pair
+    ]
+    list_bool_cli_args = ["--compute_features_per_video"]
+    list_cli_args = list_non_bool_cli_args + list_bool_cli_args
+
+    result = subprocess.run(
+        [
+            python_interpreter,
+            script_path,
+            sample_input_dir,
+        ]
+        + list_cli_args,
+        capture_output=True,
+        text=True,
+    )
+
+    # check return code
+    assert result.returncode == 0
+
+    # check name of files