diff --git a/tests/test_integration/test_napari_plugin.py b/tests/test_integration/test_napari_plugin.py
index e4f7c2b6..6f653931 100644
--- a/tests/test_integration/test_napari_plugin.py
+++ b/tests/test_integration/test_napari_plugin.py
@@ -1,10 +1,12 @@
 import pytest
-from qtpy.QtWidgets import QPushButton, QWidget
+from napari.settings import get_settings
+from qtpy.QtWidgets import QComboBox, QLineEdit, QPushButton, QSpinBox, QWidget
 
-from movement.napari._loader_widget import PosesLoader
+from movement.napari._loader_widget import SUPPORTED_POSES_FILES, PosesLoader
 from movement.napari._meta_widget import MovementMetaWidget
 
 
+# -------------------- widget fixtures ---------------------------------------#
 @pytest.fixture
 def meta_widget(make_napari_viewer_proxy) -> MovementMetaWidget:
     """Fixture to expose the MovementMetaWidget for testing.
@@ -22,7 +24,8 @@ def loader_widget(meta_widget) -> QWidget:
     return loader
 
 
-def test_meta_widget(meta_widget):
+# -------------------- tests for widget instantiation ------------------------#
+def test_meta_widget_instantiation(meta_widget):
     """Test that the meta widget is properly instantiated."""
     assert meta_widget is not None
     assert len(meta_widget.collapsible_widgets) == 1
@@ -32,19 +35,67 @@ def test_meta_widget(meta_widget):
     assert first_widget.isExpanded()
 
 
-def test_loader_widget(loader_widget):
+def test_loader_widget_instantiation(loader_widget):
     """Test that the loader widget is properly instantiated."""
     assert loader_widget is not None
     assert loader_widget.layout().rowCount() == 4
 
+    # Make sure the all rows except last start with lowercase text
+    # which ends with a semicolon
+    for i in range(loader_widget.layout().rowCount() - 1):
+        label = loader_widget.layout().itemAt(i, 0).widget()
+        assert label.text().islower()
+        assert label.text().endswith(":")
+
+    # Make sure that the source software combo box is populated
+    source_software_combo = loader_widget.findChildren(QComboBox)[0]
+    assert source_software_combo.count() == len(SUPPORTED_POSES_FILES)
+
+    # Test that the default fps is 30
+    fps_spinbox = loader_widget.findChildren(QSpinBox)[0]
+    assert fps_spinbox.value() == 30
+
+    # Make sure that the line edit for file path is empty
+    file_path_edit = loader_widget.findChildren(QLineEdit)[-1]
+    assert file_path_edit.text() == ""
+
+    # Make sure that the first button is a "Browse" button
+    browse_button = loader_widget.findChildren(QPushButton)[0]
+    assert browse_button.text() == "Browse"
+
+    # Make sure that the last row is a "Load" button
+    load_button = loader_widget.findChildren(QPushButton)[-1]
+    assert load_button.text() == "Load"
+
+    # Make sure that layer tooltips are enabled
+    assert get_settings().appearance.layer_tooltip_visibility is True
 
-def test_load_button_calls_on_load_clicked(make_napari_viewer_proxy, mocker):
-    """Test that clicking the 'Load' call the right function.
+
+# -------------------- tests for callbacks -----------------------------------#
+def test_browse_button_calls_on_browse_clicked(
+    make_napari_viewer_proxy, mocker
+):
+    """Test that clicking the 'Browse' button calls the right function.
 
     Here we have to create a new Loader widget after mocking the method.
     We cannot reuse the existing widget fixture because then it would be too
     late to mock (the widget has already "decided" which method to call).
     """
+    mock_method = mocker.patch(
+        "movement.napari._loader_widget.PosesLoader._on_browse_clicked"
+    )
+    loader = PosesLoader(make_napari_viewer_proxy)
+    browse_button = loader.findChildren(QPushButton)[0]
+    browse_button.click()
+    mock_method.assert_called_once()
+
+
+def test_load_button_calls_on_load_clicked(make_napari_viewer_proxy, mocker):
+    """Test that clicking the 'Load' button calls the right function.
+
+    Here we also have to create a new Loader widget after mocking the method,
+    as in the previous test.
+    """
     mock_method = mocker.patch(
         "movement.napari._loader_widget.PosesLoader._on_load_clicked"
     )
@@ -59,3 +110,45 @@ def test_on_load_clicked_without_file_path(loader_widget, capsys):
     loader_widget._on_load_clicked()
     captured = capsys.readouterr()
     assert "No file path specified." in captured.out
+
+
+def test_on_load_clicked_with_valid_file_path(loader_widget, caplog):
+    """Test clicking 'Load' with a valid file path.
+
+    This test checks that the `_on_load_clicked` method causes the following:
+    - creates the `data`, `props`, and `file_name` attributes
+    - emits a series of expected log messages
+    - adds a Points layer to the viewer (with the correct name)
+    - sets the playback fps to the correct value
+    """
+    # Set the file path to a valid file
+    file_path = pytest.DATA_PATHS.get("DLC_single-wasp.predictions.h5")
+    loader_widget.file_path_edit.setText(file_path.as_posix())
+
+    # Set the fps to 60
+    loader_widget.fps_spinbox.setValue(60)
+
+    # Call the _on_load_clicked method (pretend the user clicked "Load")
+    loader_widget._on_load_clicked()
+
+    # Check that class attributes have been created
+    assert loader_widget.file_name == file_path.name
+    assert loader_widget.data is not None
+    assert loader_widget.props is not None
+
+    # Check that the expected log messages were emitted
+    expected_log_messages = [
+        "Converted poses dataset to a napari Tracks array.",
+        "Tracks array shape: ",
+        "Added poses dataset as a napari Points layer.",
+        "Set napari playback speed to ",
+    ]
+    for msg in expected_log_messages:
+        assert any(msg in record.getMessage() for record in caplog.records)
+
+    # Check that a Points layer was added to the viewer
+    points_layer = loader_widget.viewer.layers[0]
+    assert points_layer.name == f"poses: {file_path.name}"
+
+    # Check that the playback fps was set correctly
+    assert get_settings().application.playback_fps == 60