diff --git a/pytests/core/test_module.py b/pytests/core/test_module.py
new file mode 100644
index 0000000..ef65c88
--- /dev/null
+++ b/pytests/core/test_module.py
@@ -0,0 +1,177 @@
+import pytest
+
+import sys
+import shlex
+
+import core.module
+import core.widget
+import core.config
+import core.input
+
+
+@pytest.fixture(autouse=True)
+def clear_events():
+    core.event.clear()
+
+
+@pytest.fixture
+def empty_config():
+    return core.config.Config([])
+
+
+@pytest.fixture
+def widget_a():
+    return core.widget.Widget("randomwWidget content", name="A")
+
+
+@pytest.fixture
+def widget_b():
+    return core.widget.Widget("another randomwWidget content", name="B")
+
+
+class SampleModule(core.module.Module):
+    def update(self):
+        if self.fail:
+            raise Exception(self.error)
+        pass
+
+
+def test_loadinvalid_module(mocker):
+    config = mocker.MagicMock()
+    module = core.module.load(module_name="i-do-not-exist", config=config)
+    assert module.__class__.__module__ == "core.module"
+    assert module.__class__.__name__ == "Error"
+
+
+@pytest.mark.skipif(
+    sys.version_info.major == 3 and sys.version_info.minor in [4, 5],
+    reason="importlib error reporting in Python 3.{4,5} different",
+)
+def test_importerror(mocker):
+    importlib = mocker.patch("core.module.importlib")
+    importlib.import_module.side_effect = ImportError("some-error")
+    config = mocker.MagicMock()
+
+    module = core.module.load(module_name="test", config=config)
+
+    assert module.__class__.__name__ == "Error"
+    assert module.widget().full_text() == "test: some-error"
+
+
+def test_loadvalid_module():
+    module = core.module.load(module_name="test")
+    assert module.__class__.__module__ == "modules.core.test"
+    assert module.__class__.__name__ == "Module"
+    assert module.state(None) == []
+
+
+def test_empty_widgets():
+    module = core.module.Module(widgets=[])
+    assert module.widgets() == []
+
+
+def test_error_widget():
+    cfg = core.config.Config(shlex.split("-p test_module.foo=5"))
+    module = core.module.Error("test-mod", "xyz", config=cfg)
+    full_text = module.full_text(module.widget())
+
+    assert module.state(None) == ["critical"]
+    assert "test-mod" in full_text
+    assert "xyz" in full_text
+
+
+def test_single_widget(widget_a):
+    module = core.module.Module(widgets=widget_a)
+    assert module.widgets() == [widget_a]
+
+
+def test_widget_list(widget_a, widget_b):
+    module = core.module.Module(widgets=[widget_a, widget_b])
+    assert module.widgets() == [widget_a, widget_b]
+
+
+def test_module_Name():
+    module = SampleModule()
+    assert module.name == "test_module"
+    assert module.module_name == "test_module"
+
+
+def testvalid_parameter():
+    cfg = core.config.Config(shlex.split("-p test_module.foo=5"))
+    module = SampleModule(config=cfg)
+    assert module.parameter("foo") == "5"
+
+
+def test_default_parameter(empty_config):
+    module = SampleModule(config=empty_config)
+    assert module.parameter("foo", "default") == "default"
+
+
+def test_default_is_none(empty_config):
+    module = SampleModule(config=empty_config)
+    assert module.parameter("foo") == None
+
+
+def test_error_widget(empty_config):
+    module = SampleModule(config=empty_config)
+    module.fail = True
+    module.error = "!!"
+    module.update_wrapper()
+    assert len(module.widgets()) == 1
+    assert module.widget().full_text() == "error: !!"
+
+
+def test_get_widget_by_name(empty_config, widget_a, widget_b):
+    module = SampleModule(config=empty_config, widgets=[widget_a, widget_b])
+
+    assert module.widget(widget_a.name) == widget_a
+    assert module.widget(widget_b.name) == widget_b
+    assert module.widget("i-do-not-exist") == None
+    assert module.widget() == widget_a
+
+
+def test_default_thresholds(empty_config, widget_a, widget_b):
+    module = SampleModule(config=empty_config, widgets=[widget_a, widget_b])
+
+    assert module.threshold_state(100, 80, 99) == "critical"
+    assert module.threshold_state(100, 80, 100) == "warning"
+    assert module.threshold_state(81, 80, 100) == "warning"
+    assert module.threshold_state(80, 80, 100) == None
+    assert module.threshold_state(10, 80, 100) == None
+
+
+def test_configured_callbacks(mocker, empty_config, widget_a, widget_b):
+    module = SampleModule(config=empty_config, widgets=[widget_a, widget_b])
+
+    cmd = "sample-tool arg1 arg2 arg3"
+    module.set("left-click", cmd)
+    module.register_callbacks()
+
+    cli = mocker.patch("core.input.util.cli")
+    cli.execute.return_value = ""
+    core.input.trigger(
+        {"button": core.input.LEFT_MOUSE, "instance": module.id,}
+    )
+
+    cli.execute.assert_called_once_with(cmd, wait=False, shell=True)
+
+
+def test_configured_callbacks_with_parameters(mocker, empty_config, widget_a):
+    module = SampleModule(config=empty_config, widgets=[widget_a])
+
+    cmd = "sample-tool {instance} {name}"
+    module.set("left-click", cmd)
+    module.register_callbacks()
+
+    cli = mocker.patch("core.input.util.cli")
+    cli.execute.return_value = ""
+    core.input.trigger(
+        {"button": core.input.LEFT_MOUSE, "instance": module.id, "name": "sample-name",}
+    )
+
+    cli.execute.assert_called_once_with(
+        cmd.format(instance=module.id, name="sample-name"), wait=False, shell=True,
+    )
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4