diff --git a/LogarithmPlotter/logarithmplotter.py b/LogarithmPlotter/logarithmplotter.py
index 975f471..d528c02 100644
--- a/LogarithmPlotter/logarithmplotter.py
+++ b/LogarithmPlotter/logarithmplotter.py
@@ -48,16 +48,31 @@ from LogarithmPlotter.util.helper import Helper
 from LogarithmPlotter.util.latex import Latex
 from LogarithmPlotter.util.js import PyJSValue
 
+LINUX_THEMES = {  # See https://specifications.freedesktop.org/menu-spec/latest/onlyshowin-registry.html
+    "COSMIC": "Basic",
+    "GNOME": "Basic",
+    "GNOME-Classic": "Basic",
+    "GNOME-Flashback": "Basic",
+    "KDE": "Fusion",
+    "LXDE": "Basic",
+    "LXQt": "Fusion",
+    "MATE": "Fusion",
+    "TDE": "Fusion",
+    "Unity": "Basic",
+    "XFCE": "Basic",
+    "Cinnamon": "Fusion",
+    "Pantheon": "Basic",
+    "DDE": "Basic",
+    "EDE": "Fusion",
+    "Endless": "Basic",
+    "Old": "Fusion",
+}
+
+
 def get_linux_theme() -> str:
-    des = {
-        "KDE": "Fusion",
-        "gnome": "Basic",
-        "lxqt": "Fusion",
-        "mate": "Fusion",
-    }
     if "XDG_SESSION_DESKTOP" in environ:
-        if environ["XDG_SESSION_DESKTOP"] in des:
-            return des[environ["XDG_SESSION_DESKTOP"]]
+        if environ["XDG_SESSION_DESKTOP"] in LINUX_THEMES:
+            return LINUX_THEMES[environ["XDG_SESSION_DESKTOP"]]
         return "Fusion"
     else:
         # Android
@@ -77,18 +92,18 @@ def get_platform_qt_style(os) -> str:
 def register_icon_directories() -> None:
     icon_fallbacks = QIcon.fallbackSearchPaths()
     base_icon_path = path.join(getcwd(), "qml", "eu", "ad5001", "LogarithmPlotter", "icons")
-    icon_fallbacks.append(path.realpath(path.join(base_icon_path, "common")))
-    icon_fallbacks.append(path.realpath(path.join(base_icon_path, "objects")))
-    icon_fallbacks.append(path.realpath(path.join(base_icon_path, "history")))
-    icon_fallbacks.append(path.realpath(path.join(base_icon_path, "settings")))
-    icon_fallbacks.append(path.realpath(path.join(base_icon_path, "settings", "custom")))
+    paths = [["common"], ["objects"], ["history"], ["settings"], ["settings", "custom"]]
+    for p in paths:
+        icon_fallbacks.append(path.realpath(path.join(base_icon_path, *p)))
     QIcon.setFallbackSearchPaths(icon_fallbacks)
 
 
 def create_qapp() -> QApplication:
     app = QApplication(argv)
     app.setApplicationName("LogarithmPlotter")
-    app.setDesktopFileName("eu.ad5001.LogarithmPlotter.desktop")
+    app.setApplicationDisplayName("LogarithmPlotter")
+    app.setApplicationVersion(f"v{__VERSION__}")
+    app.setDesktopFileName("eu.ad5001.LogarithmPlotter")
     app.setOrganizationName("Ad5001")
     app.styleHints().setShowShortcutsInContextMenus(True)
     app.setWindowIcon(QIcon(path.realpath(path.join(getcwd(), "logarithmplotter.svg"))))
@@ -101,8 +116,10 @@ def install_translation(app: QApplication) -> QTranslator:
     # Check if lang is forced.
     forcedlang = [p for p in argv if p[:7] == "--lang="]
     locale = QLocale(forcedlang[0][7:]) if len(forcedlang) > 0 else QLocale()
-    if translator.load(locale, "lp", "_", path.realpath(path.join(getcwd(), "i18n"))):
-        app.installTranslator(translator)
+    if not translator.load(locale, "lp", "_", path.realpath(path.join(getcwd(), "i18n"))):
+        # Load default translation
+        translator.load(QLocale("en"), "lp", "_", path.realpath(path.join(getcwd(), "i18n")))
+    app.installTranslator(translator)
     return translator
 
 
@@ -145,7 +162,7 @@ def run():
     latex = Latex(tempdir)
     engine, js_globals = create_engine(helper, latex, dep_time)
 
-    if len(engine.rootObjects()) == 0: # No root objects loaded
+    if len(engine.rootObjects()) == 0:  # No root objects loaded
         print("No root object", path.realpath(path.join(getcwd(), "qml")))
         exit(-1)
 
diff --git a/LogarithmPlotter/util/js.py b/LogarithmPlotter/util/js.py
index b00c645..53ba4eb 100644
--- a/LogarithmPlotter/util/js.py
+++ b/LogarithmPlotter/util/js.py
@@ -48,11 +48,11 @@ class PyJSValue:
 
     def __eq__(self, other):
         if isinstance(other, PyJSValue):
-            return self.qjs_value.equals(other.qjs_value)
+            return self.qjs_value.strictlyEquals(other.qjs_value)
         elif isinstance(other, QJSValue):
-            return self.qjs_value.equals(other)
+            return self.qjs_value.strictlyEquals(other)
         elif type(other) in (int, float, str, bool):
-            return self.qjs_value.equals(QJSValue(other))
+            return self.qjs_value.strictlyEquals(QJSValue(other))
         else:
             return False
 
diff --git a/LogarithmPlotter/__main__.py b/tests/python/globals.py
similarity index 90%
rename from LogarithmPlotter/__main__.py
rename to tests/python/globals.py
index 6c86e82..def1415 100644
--- a/LogarithmPlotter/__main__.py
+++ b/tests/python/globals.py
@@ -1,20 +1,20 @@
 """
  *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
  *  Copyright (C) 2021-2024  Ad5001
- * 
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
- * 
+ *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
- * 
+ *
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 """
-if __name__ == "__main__":
-    from .logarithmplotter import run
-    run()
+from LogarithmPlotter.logarithmplotter import create_qapp
+
+app = create_qapp()
\ No newline at end of file
diff --git a/tests/python/test_helper.py b/tests/python/test_helper.py
index 3e3975e..c4f6ea7 100644
--- a/tests/python/test_helper.py
+++ b/tests/python/test_helper.py
@@ -1,3 +1,21 @@
+"""
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2021-2024  Ad5001
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import pytest
 from os import getcwd
 from os.path import join
diff --git a/tests/python/test_latex.py b/tests/python/test_latex.py
index 8f1d8a2..f02832e 100644
--- a/tests/python/test_latex.py
+++ b/tests/python/test_latex.py
@@ -1,3 +1,21 @@
+"""
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2021-2024  Ad5001
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
 import pytest
 from tempfile import TemporaryDirectory
 from shutil import which
diff --git a/tests/python/test_main.py b/tests/python/test_main.py
index 1dfbcbb..d96bb4a 100644
--- a/tests/python/test_main.py
+++ b/tests/python/test_main.py
@@ -1,6 +1,33 @@
-import pytest
+"""
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2021-2024  Ad5001
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
 
-from LogarithmPlotter.logarithmplotter import get_linux_theme
+import pytest
+from os import environ
+from os.path import exists, join
+from PySide6.QtGui import QIcon
+from tempfile import TemporaryDirectory
+
+from LogarithmPlotter.logarithmplotter import get_linux_theme, LINUX_THEMES, get_platform_qt_style, \
+    register_icon_directories, install_translation, create_engine
+from LogarithmPlotter.util import config
+from LogarithmPlotter.util.helper import Helper
+from LogarithmPlotter.util.latex import Latex
+from globals import app
 
 THEMES = [
     "Basic",
@@ -11,6 +38,61 @@ THEMES = [
     "macOS"
 ]
 
+OS_PLATFORMS = [
+    "linux",
+    "freebsd",
+    "win32",
+    "cygwin",
+    "darwin"
+]
+
+@pytest.fixture()
+def temporary():
+    directory = TemporaryDirectory()
+    config.CONFIG_PATH = join(directory.name, "config.json")
+    tmpfile = join(directory.name, "graph.png")
+    yield tmpfile, directory
+    directory.cleanup()
+
 class TestMain:
-    def test_themes(self):
-        get_linux_theme()
\ No newline at end of file
+    def test_linux_themes(self):
+        # Check without a desktop
+        if "XDG_SESSION_DESKTOP" in environ:
+            del environ["XDG_SESSION_DESKTOP"]
+        assert get_linux_theme() in THEMES
+        # Test various environments.
+        environ["XDG_SESSION_DESKTOP"] = "GNOME"
+        assert get_linux_theme() in THEMES
+        # Test various environments.
+        environ["XDG_SESSION_DESKTOP"] = "NON-EXISTENT"
+        assert get_linux_theme() in THEMES
+        # Check all linux themes are in list
+        for desktop, theme in LINUX_THEMES.items():
+            assert theme in THEMES
+
+    def test_os_themes(self):
+        for platform in OS_PLATFORMS:
+            assert get_platform_qt_style(platform) in THEMES
+
+    def test_icon_directories(self):
+        base_paths = QIcon.fallbackSearchPaths()
+        register_icon_directories()
+        # Check if registered
+        assert len(base_paths) < len(QIcon.fallbackSearchPaths())
+        # Check if all exists
+        for p in QIcon.fallbackSearchPaths():
+            assert exists(p)
+
+    def test_app(self, temporary):
+        assert not app.windowIcon().isNull()
+        # Translations
+        translator = install_translation(app)
+        assert not translator.isEmpty()
+        # Engine
+        tmpfile, tempdir = temporary
+        helper = Helper(".", tmpfile)
+        latex = Latex(tempdir)
+        engine, js_globals = create_engine(helper, latex, 0)
+        assert len(engine.rootObjects()) > 0 # QML File loaded.
+        assert type(engine.rootContext().contextProperty("TestBuild")) is bool
+        assert engine.rootContext().contextProperty("StartTime") == 0
\ No newline at end of file
diff --git a/tests/python/test_pyjs.py b/tests/python/test_pyjs.py
index 2e632af..18c52eb 100644
--- a/tests/python/test_pyjs.py
+++ b/tests/python/test_pyjs.py
@@ -1,30 +1,52 @@
+"""
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2021-2024  Ad5001
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
 
 import pytest
 from PySide6.QtQml import QJSEngine, QJSValue
-from PySide6.QtWidgets import QApplication
 
 from LogarithmPlotter.util.js import PyJSValue, InvalidAttributeValueException
+from globals import app
 
-app = QApplication()
-engine = QJSEngine()
-obj = PyJSValue(engine.globalObject())
+@pytest.fixture()
+def data():
+    engine = QJSEngine()
+    obj = PyJSValue(engine.globalObject())
+    yield engine, obj
 
 class TestPyJS:
-    def test_set(self):
+    def test_set(self, data):
+        engine, obj = data
         obj.num1 = 2
         obj.num2 = QJSValue(2)
         obj.num3 = PyJSValue(QJSValue(2))
         with pytest.raises(InvalidAttributeValueException):
             obj.num3 = object()
 
-    def test_eq(self):
+    def test_eq(self, data):
+        engine, obj = data
         obj.num = QJSValue(2)
         assert obj.num == 2
         assert obj.num == QJSValue(2)
         assert obj.num == PyJSValue(QJSValue(2))
         assert obj.num != object()
 
-    def test_function(self):
+    def test_function(self, data):
+        engine, obj = data
         function = PyJSValue(engine.evaluate("(function(argument) {return argument*2})"))
         assert function(3) == 6
         assert function(10) == 20