diff --git a/.gitignore b/.gitignore
index 2397aa4..e0c7a94 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 *.coverage
 *.ui~
 *.txt
+*.patch
 PKGBUILD
diff --git a/Makefile b/Makefile
index 57ca21e..efa2a93 100644
--- a/Makefile
+++ b/Makefile
@@ -6,16 +6,17 @@ export EMMENTAL_LIB   = ${PREFIX}/lib/emmental
 export EMMENTAL_BIN   = ${PREFIX}/bin
 export EMMENTAL_SHARE = ${PREFIX}/share
 
-export EMMENTAL_MAJOR = $(shell grep \^MAJOR lib/version.py | awk -F= '{ gsub(/ /,""); print $$2}')
-export EMMENTAL_MINOR = $(shell grep \^MINOR lib/version.py | awk -F= '{ gsub(/ /,""); print $$2}')
-export EMMENTAL_TARGZ = https://git.nowheycreamery.com/anna/emmental/archive/emmental-${EMMENTAL_MAJOR}.${EMMENTAL_MINOR}.tar.gz
-export EMMENTAL_CSUM  = $(shell curl -s ${EMMENTAL_TARGZ} | sha256sum | awk '{print $$1}')
+all: flake8
 
 clean:
 	find . -type d -name __pycache__ -exec rm -r {} \+
 	find data/ -type d -name "Test Album" -exec rm -r {} \+
 	find data/ -type d -name "Test Library" -exec rm -r {} \+
 
+.PHONY:flake8
+flake8:
+	flake8 emmental/ tests/
+
 .PHONY: install
 install:
 	exec tools/install.sh
@@ -29,12 +30,18 @@ uninstall:
 
 .PHONY: pkgbuild
 pkgbuild:
+	$(eval MAJOR := $(shell grep \^MAJOR lib/version.py | awk -F= '{ gsub(/ /,""); print $$2}'))
+	$(eval MINOR := $(shell grep \^MINOR lib/version.py | awk -F= '{ gsub(/ /,""); print $$2}'))
+	$(eval TAG := $(shell git describe --tags --abbrev=0))
+	$(eval CSUM := $(shell git archive --format tar.gz $(TAG) | sha256sum | awk '{print $$1}'))
 	cp data/PKGBUILD aur/
-	sed -i 's|{MAJOR}.{MINOR}|${EMMENTAL_MAJOR}.${EMMENTAL_MINOR}|' aur/PKGBUILD
-	sed -i 's|{SHA256SUM}|${EMMENTAL_CSUM}|' aur/PKGBUILD
+	sed -i 's|{MAJOR}.{MINOR}|${MAJOR}.${MINOR}|' aur/PKGBUILD
+	sed -i 's|{SHA256SUM}|$(CSUM)|' aur/PKGBUILD
 	cd aur && makepkg --printsrcinfo > .SRCINFO
 
+.PHONY: pytest
+pytest:
+	pytest
+
 .PHONY: tests
-tests:
-	python tools/generate_tracks.py
-	python -m unittest discover -v
+tests: pytest flake8
diff --git a/emmental/__init__.py b/emmental/__init__.py
new file mode 100644
index 0000000..d69ed56
--- /dev/null
+++ b/emmental/__init__.py
@@ -0,0 +1,35 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Set up our Application."""
+from . import gsetup
+from . import options
+from gi.repository import GLib
+from gi.repository import Adw
+
+MAJOR_VERSION = 3
+MINOR_VERSION = 0
+VERSION_STRING = f"Emmental {MAJOR_VERSION}.{MINOR_VERSION}{gsetup.DEBUG_STR}"
+
+
+class Application(Adw.Application):
+    """Our custom Adw.Application."""
+
+    def __init__(self):
+        """Initialize an Application."""
+        super().__init__(application_id=gsetup.APPLICATION_ID)
+        self.add_main_option_entries([options.Version])
+
+    def do_handle_local_options(self, opts: GLib.VariantDict) -> int:
+        """Handle any command line options."""
+        if opts.contains("version"):
+            print(VERSION_STRING)
+            gsetup.print_versions()
+            return 0
+        return -1
+
+    def do_startup(self) -> None:
+        """Handle the Adw.Application::startup signal."""
+        Adw.Application.do_startup(self)
+
+    def do_activate(self) -> None:
+        """Handle the Adw.Application::activate signal."""
+        Adw.Application.do_activate(self)
diff --git a/emmental/gsetup.py b/emmental/gsetup.py
new file mode 100644
index 0000000..b102342
--- /dev/null
+++ b/emmental/gsetup.py
@@ -0,0 +1,26 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Set up GObject Introspection."""
+import sys
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+
+DEBUG_STR = "-debug" if __debug__ else ""
+APPLICATION_ID = f"com.nowheycreamery.emmental{DEBUG_STR}"
+
+
+def __print_version(subsystem, major, minor, micro):
+    print(f"  ⋅ {subsystem} {major}.{minor}.{micro}")
+
+
+def print_versions():
+    """Print version information for libraries we use."""
+    __print_version("Python", sys.version_info.major, sys.version_info.minor,
+                    sys.version_info.micro)
+    __print_version("Gtk", gi.repository.Gtk.MAJOR_VERSION,
+                    gi.repository.Gtk.MINOR_VERSION,
+                    gi.repository.Gtk.MICRO_VERSION)
+    __print_version("Libadwaita", gi.repository.Adw.MAJOR_VERSION,
+                    gi.repository.Adw.MINOR_VERSION,
+                    gi.repository.Adw.MICRO_VERSION)
diff --git a/emmental/options.py b/emmental/options.py
new file mode 100644
index 0000000..3a8f659
--- /dev/null
+++ b/emmental/options.py
@@ -0,0 +1,12 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Configure command line options passed to Emmental."""
+from gi.repository import GLib
+
+Version = GLib.OptionEntry()
+Version.long_name = "version"
+Version.short_name = ord("v")
+Version.flags = GLib.OptionFlags.NONE
+Version.arg = GLib.OptionArg.NONE
+Version.arg_data = None
+Version.description = "Print version information and exit"
+Version.arg_description = None
diff --git a/emmental3.py b/emmental3.py
new file mode 100755
index 0000000..12dd5ea
--- /dev/null
+++ b/emmental3.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+# Copyright 2022 (c) Anna Schumaker.
+"""The main Emmental application, version 3.0"""
+import sys
+import emmental
+
+if __name__ == "__main__":
+    emmental.Application().run(sys.argv)
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..7a0473e
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,7 @@
+[pytest]
+required_plugins = pytest-timeout pytest-subtests
+testpaths = emmental/ tests/
+addopts = -rP
+timeout = 5
+timeout_method = thread
+timeout_func_only = true
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..8d37d26
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1,2 @@
+# Copyright 2022 (c) Anna Schumaker
+"""Needed to initialize tests correctly."""
diff --git a/tests/test_emmental.py b/tests/test_emmental.py
new file mode 100644
index 0000000..46012d4
--- /dev/null
+++ b/tests/test_emmental.py
@@ -0,0 +1,25 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Test as much as we can of the Emmental Application."""
+import unittest
+import gi
+import emmental
+
+
+class TestEmmental(unittest.TestCase):
+    """Emmental Application test case."""
+
+    def setUp(self):
+        """Set up common variables."""
+        self.application = emmental.Application()
+
+    def test_version(self):
+        """Check that version constants have been set properly."""
+        self.assertEqual(emmental.MAJOR_VERSION, 3)
+        self.assertEqual(emmental.MINOR_VERSION, 0)
+        self.assertEqual(emmental.VERSION_STRING, "Emmental 3.0-debug")
+
+    def test_application(self):
+        """Check that the application instance is initialized properly."""
+        self.assertIsInstance(self.application, gi.repository.Adw.Application)
+        self.assertEqual(self.application.get_application_id(),
+                         "com.nowheycreamery.emmental-debug")
diff --git a/tests/test_gsetup.py b/tests/test_gsetup.py
new file mode 100644
index 0000000..1501ac2
--- /dev/null
+++ b/tests/test_gsetup.py
@@ -0,0 +1,30 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Test that the gi.repository has been configured correctly."""
+import unittest
+import emmental
+import gi
+
+
+class TestGSetup(unittest.TestCase):
+    """GObject Introspection configuration test case."""
+
+    def test_require_version(self):
+        """Check that gi.require_version() has been called."""
+        self.assertEqual(gi.get_required_version("Gtk"), "4.0")
+        self.assertEqual(gi.get_required_version("Adw"), "1")
+
+    def test_adw(self):
+        """Check that libadwaita style has been set."""
+        style = gi.repository.Adw.StyleManager.get_default()
+        self.assertEqual(style.get_color_scheme(),
+                         gi.repository.Adw.ColorScheme.DEFAULT)
+
+    def test_import(self):
+        """Check that modules have been imported."""
+        self.assertIsNotNone(emmental.gsetup.gi)
+
+    def test_application_id(self):
+        """Check that the application id is generated properly."""
+        self.assertEqual(emmental.gsetup.DEBUG_STR, "-debug")
+        self.assertEqual(emmental.gsetup.APPLICATION_ID,
+                         "com.nowheycreamery.emmental-debug")
diff --git a/tests/test_options.py b/tests/test_options.py
new file mode 100644
index 0000000..5d936a3
--- /dev/null
+++ b/tests/test_options.py
@@ -0,0 +1,19 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Test setup of the Emmental command line options."""
+import unittest
+import gi
+import emmental.options
+
+
+class TestOptions(unittest.TestCase):
+    """Test case for our various command line options."""
+
+    def test_version(self):
+        """Check that the version option is set up properly."""
+        opt = emmental.options.Version
+        self.assertIsInstance(opt, gi.repository.GLib.OptionEntry)
+        self.assertEqual(opt.long_name, "version")
+        self.assertEqual(opt.short_name, ord("v"))
+        self.assertEqual(opt.flags, gi.repository.GLib.OptionFlags.NONE)
+        self.assertEqual(opt.arg, gi.repository.GLib.OptionArg.NONE)
+        self.assertEqual(opt.arg_data, 0)