diff --git a/tests/modules/core/test_memory.py b/tests/modules/core/test_memory.py
index 2b87b8a..b133c52 100644
--- a/tests/modules/core/test_memory.py
+++ b/tests/modules/core/test_memory.py
@@ -1,5 +1,121 @@
 import pytest
+from unittest import TestCase, mock
 
-def test_load_module():
-    __import__("modules.core.memory")
+import core.config
+import core.widget
+import modules.core.memory
 
+def build_module(args = []):
+    config = core.config.Config(args)
+    return modules.core.memory.Module(config=config, theme=None)
+
+def memory_widget(module):
+    return module.widgets()[0]
+
+def meminfo_mock(
+    total,
+    available,
+    free = 0,
+    buffers = 0,
+    cached = 0,
+    slab = 0
+):
+    data = []
+    states = [
+        ('MemTotal', total),
+        ('MemAvailable', available),
+        ('MemFree', free),
+        ('Buffers', buffers),
+        ('Cached', cached),
+        ('Slab', slab)
+    ]
+
+
+    for i, (key, value) in enumerate(states):
+        data.append('{}: {} kB'.format(key, value))
+
+    return '\n'.join(data)
+
+class TestMemory(TestCase):
+    def test_load_module(self):
+        __import__("modules.core.memory")
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(2048, 1024)))
+    def test_default_healthy_state(self):
+        module = build_module()
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '1.00MiB/2.00MiB (50.00%)'
+        assert module.state(widget) == None
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(8196, 1024)))
+    def test_default_warning_state(self):
+        module = build_module()
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '7.00MiB/8.00MiB (87.51%)'
+        assert module.state(widget) == 'warning'
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(2048, 0)))
+    def test_default_critical_state(self):
+        module = build_module()
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '2.00MiB/2.00MiB (100.00%)'
+        assert module.state(widget) == 'critical'
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(4096, 3068)))
+    def test_custom_warning_parameter(self):
+        module = build_module(['-p', 'memory.warning=20'])
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '1.00MiB/4.00MiB (25.10%)'
+        assert module.state(widget) == 'warning'
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(8196, 4096)))
+    def test_custom_critical_parameter(self):
+        module = build_module(['-p', 'memory.critical=50'])
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '4.00MiB/8.00MiB (50.02%)'
+        assert module.state(widget) == 'critical'
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(2048, 1024)))
+    def test_usedonly_parameter(self):
+        module = build_module(['-p', 'memory.usedonly=true'])
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '1.00MiB'
+        assert module.state(widget) == None
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(2048, 1024)))
+    def test_format_parameter(self):
+        module = build_module(['-p', 'memory.format={used}.{total}'])
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '1.00MiB.2.00MiB'
+        assert module.state(widget) == None
+
+    @mock.patch('builtins.open', mock.mock_open(read_data=meminfo_mock(2048, 1024)))
+    def test_format_parameter_with_percent(self):
+        module = build_module(['-p', 'memory.format={percent}%'])
+        module.update()
+
+        widget = memory_widget(module)
+
+        assert widget.full_text() == '50.0%'
+        assert module.state(widget) == None