diff --git a/tests/modules/contrib/test_amixer.py b/tests/modules/contrib/test_amixer.py
index b1cfbf0..4ff37a3 100644
--- a/tests/modules/contrib/test_amixer.py
+++ b/tests/modules/contrib/test_amixer.py
@@ -1,5 +1,159 @@
 import pytest
 
+import util.cli
+import core.config
+import modules.contrib.amixer
+
+@pytest.fixture
+def module_mock(request):
+    def _module_mock(config = []):
+        return modules.contrib.amixer.Module(
+            config=core.config.Config(config),
+            theme=None
+        )
+
+    yield _module_mock
+
+@pytest.fixture
+def amixer_mock():
+    def _mock(device='Master', volume='10%', state='on'):
+        return """
+        Simple mixer control '{device}',0
+          Capabilities: pvolume pswitch pswitch-joined
+          Playback channels: Front Left - Front Right
+          Limits: Playback 0 - 65536
+          Mono:
+          Front Left: Playback 55705 [{volume}%] [{state}]
+          Front Right: Playback 55705 [{volume}%] [{state}]
+        """.format(
+            device=device,
+            volume=volume,
+            state=state
+        )
+
+    return _mock
+
 def test_load_module():
     __import__("modules.contrib.amixer")
 
+def test_initial_full_text(module_mock, amixer_mock, mocker):
+    module = module_mock()
+    assert module.widget().full_text() == 'n/a'
+
+def test_input_registration(mocker):
+   input_register = mocker.patch('core.input.register')
+
+   module = modules.contrib.amixer.Module(
+       config=core.config.Config([]),
+       theme=None
+   )
+
+   input_register.assert_any_call(
+       module,
+       button=core.input.WHEEL_DOWN,
+       cmd=module.decrease_volume
+   )
+
+   input_register.assert_any_call(
+       module,
+       button=core.input.WHEEL_UP,
+       cmd=module.increase_volume
+   )
+
+   input_register.assert_any_call(
+       module,
+       button=core.input.LEFT_MOUSE,
+       cmd=module.toggle
+   )
+
+def test_volume_update(module_mock, amixer_mock, mocker):
+    mocker.patch(
+        'util.cli.execute',
+        return_value=amixer_mock(volume='25%', state='on')
+    )
+
+    module = module_mock()
+    widget = module.widget()
+
+    module.update()
+    assert widget.full_text() == '25%'
+    assert module.state(widget) == ['unmuted']
+
+def test_muted_update(module_mock, amixer_mock, mocker):
+    mocker.patch(
+        'util.cli.execute',
+        return_value=amixer_mock(volume='50%', state='off')
+    )
+
+    module = module_mock()
+    widget = module.widget()
+
+    module.update()
+    assert widget.full_text() == '50%'
+    assert module.state(widget) == ['warning', 'muted']
+
+def test_exception_update(module_mock, mocker):
+    mocker.patch(
+        'util.cli.execute',
+        side_effect=Exception
+    )
+
+    module = module_mock()
+    widget = module.widget()
+
+    module.update()
+    assert widget.full_text() == 'n/a'
+
+def test_unavailable_amixer(module_mock, mocker):
+    mocker.patch('util.cli.execute', return_value='Invalid')
+
+    module = module_mock()
+    widget = module.widget()
+
+    module.update()
+    assert widget.full_text() == '0%'
+
+def test_toggle(module_mock, mocker):
+    command = mocker.patch('util.cli.execute')
+    module = module_mock()
+    module.toggle(False)
+    command.assert_called_once_with('amixer -q set Master,0 toggle')
+
+def test_default_volume(module_mock, mocker):
+    module = module_mock()
+
+    command = mocker.patch('util.cli.execute')
+    module.increase_volume(False)
+    command.assert_called_once_with('amixer -q set Master,0 4%+')
+
+    command = mocker.patch('util.cli.execute')
+    module.decrease_volume(False)
+    command.assert_called_once_with('amixer -q set Master,0 4%-')
+
+def test_custom_volume(module_mock, mocker):
+    module = module_mock(['-p', 'amixer.percent_change=25'])
+
+    command = mocker.patch('util.cli.execute')
+    module.increase_volume(False)
+    command.assert_called_once_with('amixer -q set Master,0 25%+')
+
+    command = mocker.patch('util.cli.execute')
+    module.decrease_volume(False)
+    command.assert_called_once_with('amixer -q set Master,0 25%-')
+
+def test_custom_device(module_mock, mocker):
+    mocker.patch('util.cli.execute')
+    module = module_mock(['-p', 'amixer.device=CustomMaster'])
+
+    command = mocker.patch('util.cli.execute')
+    module.toggle(False)
+    command.assert_called_once_with('amixer -q set CustomMaster toggle')
+
+    command = mocker.patch('util.cli.execute')
+    module.increase_volume(False)
+    command.assert_called_once_with('amixer -q set CustomMaster 4%+')
+
+    command = mocker.patch('util.cli.execute')
+    module.decrease_volume(False)
+    command.assert_called_once_with('amixer -q set CustomMaster 4%-')
+