diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55b5ca4..7179289 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,16 +6,24 @@ on:
       - main
   workflow_call:
 
+# Cancel active CI runs for a PR before starting another run
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 defaults:
   run:
-    shell: bash  # https://github.com/beeware/briefcase/pull/912
+    shell: bash
+
+env:
+  FORCE_COLOR: "1"
 
 jobs:
   pre-commit:
     name: Pre-commit checks
     uses: beeware/.github/.github/workflows/pre-commit-run.yml@main
     with:
-      pre-commit-source: "pre-commit"
+      pre-commit-source: pre-commit
 
   verify-apps:
     name: Build apps
@@ -31,16 +39,4 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
-        # PySide2 doesn't publish a binary wheel that is compatible
-        # with Python 3.11+, and doesn't publish *any* universal or ARM64 wheels,
-        # and is unlikely to ever do so, so we can't test pyside2.
         framework: [ "toga", "pyside6", "ppb", "pygame" ]
-        exclude:
-          # PySide6 hasn't published a binary wheel that is compatible
-          # with Python 3.12 yet.
-          - python-version: "3.12"
-            framework: "pyside6"
-          # Pygame hasn't published a binary wheel that is compatible
-          # with Python 3.12 yet.
-          - python-version: "3.12"
-            framework: "pygame"
diff --git a/tests/apps/verify-ppb/pyproject.toml b/tests/apps/verify-ppb/pyproject.toml
deleted file mode 100644
index fe01c07..0000000
--- a/tests/apps/verify-ppb/pyproject.toml
+++ /dev/null
@@ -1,23 +0,0 @@
-[tool.briefcase]
-project_name = "Hello PPB"
-bundle = "org.beeware"
-version = "0.0.1"
-url = "https://beeware.org/"
-license = "BSD license"
-author = 'Brutus'
-author_email = "contact@beeware.org"
-
-[tool.briefcase.app.verify-ppb]
-formal_name = "Hello PPB"
-description = "A PPB test app"
-icon = "src/verify_ppb/resources/verify-ppb"
-sources = ['src/verify_ppb']
-requires = [
-    'ppb~=1.1',
-]
-
-[tool.briefcase.app.verify-ppb.macOS.Xcode]
-requires = [
-    'std-nslog~=1.0.0'
-]
-template = "../../.."
diff --git a/tests/apps/verify-ppb/src/verify_ppb/__init__.py b/tests/apps/verify-ppb/src/verify_ppb/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-ppb/src/verify_ppb/__main__.py b/tests/apps/verify-ppb/src/verify_ppb/__main__.py
deleted file mode 100644
index ff7b0d0..0000000
--- a/tests/apps/verify-ppb/src/verify_ppb/__main__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from verify_ppb.app import main
-
-if __name__ == '__main__':
-    main()
diff --git a/tests/apps/verify-ppb/src/verify_ppb/app.py b/tests/apps/verify-ppb/src/verify_ppb/app.py
deleted file mode 100644
index 4dd0b0a..0000000
--- a/tests/apps/verify-ppb/src/verify_ppb/app.py
+++ /dev/null
@@ -1,46 +0,0 @@
-"""
-A PPB test app
-"""
-
-import os
-import sys
-
-try:
-    from importlib import metadata as importlib_metadata
-except ImportError:
-    # Backwards compatibility - importlib.metadata was added in Python 3.8
-    import importlib_metadata
-
-import ppb
-
-
-class HelloPPB(ppb.Scene):
-    def __init__(self, **props):
-        super().__init__(**props)
-
-        self.add(ppb.Sprite(
-            image=ppb.Image('verify_ppb/resources/verify-ppb.png'),
-        ))
-
-
-def main():
-    # Linux desktop environments use app's .desktop file to integrate the app
-    # to their application menus. The .desktop file of this app will include
-    # StartupWMClass key, set to app's formal name, which helps associate
-    # app's windows to its menu item.
-    #
-    # For association to work any windows of the app must have WMCLASS
-    # property set to match the value set in app's desktop file. For PPB this
-    # is set using environment variable.
-
-    # Find the name of the module that was used to start the app
-    app_module = sys.modules['__main__'].__package__
-    # Retrieve the app's metadata
-    metadata = importlib_metadata.metadata(app_module)
-
-    os.environ['SDL_VIDEO_X11_WMCLASS'] = metadata['Formal-Name']
-
-    ppb.run(
-        starting_scene=HelloPPB,
-        title='Hello PPB',
-    )
diff --git a/tests/apps/verify-ppb/src/verify_ppb/resources/__init__.py b/tests/apps/verify-ppb/src/verify_ppb/resources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-ppb/src/verify_ppb/resources/verify-ppb.icns b/tests/apps/verify-ppb/src/verify_ppb/resources/verify-ppb.icns
deleted file mode 100644
index 27b43d3..0000000
Binary files a/tests/apps/verify-ppb/src/verify_ppb/resources/verify-ppb.icns and /dev/null differ
diff --git a/tests/apps/verify-pygame/CHANGELOG b/tests/apps/verify-pygame/CHANGELOG
deleted file mode 100644
index 5175552..0000000
--- a/tests/apps/verify-pygame/CHANGELOG
+++ /dev/null
@@ -1 +0,0 @@
-Dummy changelog for test purposes.
diff --git a/tests/apps/verify-pygame/LICENSE b/tests/apps/verify-pygame/LICENSE
deleted file mode 100644
index 3ce3640..0000000
--- a/tests/apps/verify-pygame/LICENSE
+++ /dev/null
@@ -1 +0,0 @@
-Dummy license for test purposes.
diff --git a/tests/apps/verify-pygame/pyproject.toml b/tests/apps/verify-pygame/pyproject.toml
deleted file mode 100644
index d3ee2f8..0000000
--- a/tests/apps/verify-pygame/pyproject.toml
+++ /dev/null
@@ -1,21 +0,0 @@
-[tool.briefcase]
-project_name = "Hello Pygame"
-bundle = "org.beeware"
-version = "0.0.1"
-url = "https://beeware.org/"
-license = "BSD license"
-author = 'Brutus'
-author_email = "contact@beeware.org"
-
-[tool.briefcase.app.verify-pygame]
-formal_name = "Hello Pygame"
-description = "A Pygame test app"
-icon = "src/verify_pygame/resources/verify-pygame"
-sources = ['src/verify_pygame']
-requires = [
-    'pygame~=2.2.0',
-]
-
-[tool.briefcase.app.verify-pygame.macOS.Xcode]
-requires = []
-template = '../../../'
diff --git a/tests/apps/verify-pygame/src/verify_pygame/__init__.py b/tests/apps/verify-pygame/src/verify_pygame/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pygame/src/verify_pygame/__main__.py b/tests/apps/verify-pygame/src/verify_pygame/__main__.py
deleted file mode 100644
index f18aa73..0000000
--- a/tests/apps/verify-pygame/src/verify_pygame/__main__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from verify_pygame.app import main
-
-if __name__ == '__main__':
-    main()
diff --git a/tests/apps/verify-pygame/src/verify_pygame/app.py b/tests/apps/verify-pygame/src/verify_pygame/app.py
deleted file mode 100644
index a20dd50..0000000
--- a/tests/apps/verify-pygame/src/verify_pygame/app.py
+++ /dev/null
@@ -1,50 +0,0 @@
-"""
-A Pygame test app
-"""
-
-import pygame
-import sys
-import os
-
-try:
-    from importlib import metadata as importlib_metadata
-except ImportError:
-    # Backwards compatibility - importlib.metadata was added in Python 3.8
-    import importlib_metadata
-
-SCREEN_WIDTH, SCREEN_HEIGHT = 800, 600
-WHITE = (255, 255, 255)
-
-
-def main():
-    # Linux desktop environments use app's .desktop file to integrate the app
-    # to their application menus. The .desktop file of this app will include
-    # StartupWMClass key, set to app's formal name, which helps associate
-    # app's windows to its menu item.
-    #
-    # For association to work any windows of the app must have WMCLASS
-    # property set to match the value set in app's desktop file. For PPB this
-    # is set using environment variable.
-
-    # Find the name of the module that was used to start the app
-    app_module = sys.modules["__main__"].__package__
-    # Retrieve the app's metadata
-    metadata = importlib_metadata.metadata(app_module)
-
-    os.environ["SDL_VIDEO_X11_WMCLASS"] = metadata["Formal-Name"]
-
-    pygame.init()
-    pygame.display.set_caption(metadata["Formal-Name"])
-    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
-
-    running = True
-    while running:
-        for event in pygame.event.get():
-            if event.type == pygame.QUIT:
-                running = False
-                break
-
-        screen.fill(WHITE)
-        pygame.display.flip()
-
-    pygame.quit()
diff --git a/tests/apps/verify-pygame/src/verify_pygame/resources/__init__.py b/tests/apps/verify-pygame/src/verify_pygame/resources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.icns b/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.icns
deleted file mode 100644
index 27b43d3..0000000
Binary files a/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.icns and /dev/null differ
diff --git a/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.png b/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.png
deleted file mode 100644
index 0ab2cb6..0000000
Binary files a/tests/apps/verify-pygame/src/verify_pygame/resources/verify-pygame.png and /dev/null differ
diff --git a/tests/apps/verify-pyside2/pyproject.toml b/tests/apps/verify-pyside2/pyproject.toml
deleted file mode 100644
index d2437c9..0000000
--- a/tests/apps/verify-pyside2/pyproject.toml
+++ /dev/null
@@ -1,24 +0,0 @@
-[tool.briefcase]
-project_name = "Hello PySide2"
-bundle = "org.beeware"
-version = "0.0.1"
-url = "https://beeware.org/"
-license = "BSD license"
-author = 'Brutus'
-author_email = "contact@beeware.org"
-
-[tool.briefcase.app.verify-pyside2]
-formal_name = "Hello PySide2"
-description = "A PySide2 test app"
-icon = "src/verify_pyside2/resources/verify-pyside2"
-sources = ['src/verify_pyside2']
-requires = [
-    'pyside2>=5.15.2',
-]
-
-
-[tool.briefcase.app.verify-pyside2.macOS.Xcode]
-requires = [
-    'std-nslog~=1.0.0'
-]
-template = "../../.."
diff --git a/tests/apps/verify-pyside2/src/verify_pyside2/__init__.py b/tests/apps/verify-pyside2/src/verify_pyside2/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pyside2/src/verify_pyside2/__main__.py b/tests/apps/verify-pyside2/src/verify_pyside2/__main__.py
deleted file mode 100644
index c1e3eca..0000000
--- a/tests/apps/verify-pyside2/src/verify_pyside2/__main__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from verify_pyside2.app import main
-
-if __name__ == '__main__':
-    main()
diff --git a/tests/apps/verify-pyside2/src/verify_pyside2/app.py b/tests/apps/verify-pyside2/src/verify_pyside2/app.py
deleted file mode 100644
index 26bb36c..0000000
--- a/tests/apps/verify-pyside2/src/verify_pyside2/app.py
+++ /dev/null
@@ -1,44 +0,0 @@
-"""
-A PySide2 test app
-"""
-import sys
-
-try:
-    from importlib import metadata as importlib_metadata
-except ImportError:
-    # Backwards compatibility - importlib.metadata was added in Python 3.8
-    import importlib_metadata
-
-from PySide2 import QtWidgets
-
-
-class HelloPySide2(QtWidgets.QMainWindow):
-    def __init__(self):
-        super().__init__()
-        self.init_ui()
-
-    def init_ui(self):
-        self.setWindowTitle('verify-pyside2')
-        self.show()
-
-
-def main():
-    # Linux desktop environments use app's .desktop file to integrate the app
-    # to their application menus. The .desktop file of this app will include
-    # StartupWMClass key, set to app's formal name, which helps associate
-    # app's windows to its menu item.
-    #
-    # For association to work any windows of the app must have WMCLASS
-    # property set to match the value set in app's desktop file. For PySide2
-    # this is set with setApplicationName().
-
-    # Find the name of the module that was used to start the app
-    app_module = sys.modules['__main__'].__package__
-    # Retrieve the app's metadata
-    metadata = importlib_metadata.metadata(app_module)
-
-    QtWidgets.QApplication.setApplicationName(metadata['Formal-Name'])
-
-    app = QtWidgets.QApplication(sys.argv)
-    main_window = HelloPySide2()
-    sys.exit(app.exec_())
diff --git a/tests/apps/verify-pyside2/src/verify_pyside2/resources/__init__.py b/tests/apps/verify-pyside2/src/verify_pyside2/resources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pyside2/src/verify_pyside2/resources/verify-pyside2.icns b/tests/apps/verify-pyside2/src/verify_pyside2/resources/verify-pyside2.icns
deleted file mode 100644
index 27b43d3..0000000
Binary files a/tests/apps/verify-pyside2/src/verify_pyside2/resources/verify-pyside2.icns and /dev/null differ
diff --git a/tests/apps/verify-pyside6/pyproject.toml b/tests/apps/verify-pyside6/pyproject.toml
deleted file mode 100644
index 5ef532c..0000000
--- a/tests/apps/verify-pyside6/pyproject.toml
+++ /dev/null
@@ -1,24 +0,0 @@
-[tool.briefcase]
-project_name = "Hello PySide6"
-bundle = "org.beeware"
-version = "0.0.1"
-url = "https://beeware.org/"
-license = "BSD license"
-author = 'Brutus'
-author_email = "contact@beeware.org"
-
-[tool.briefcase.app.verify-pyside6]
-formal_name = "Hello PySide6"
-description = "A PySide6 test app"
-icon = "src/verify_pyside6/resources/verify-pyside6"
-sources = ['src/verify_pyside6']
-requires = [
-    'pyside6>=6.2.4',
-]
-
-
-[tool.briefcase.app.verify-pyside6.macOS.Xcode]
-requires = [
-    'std-nslog~=1.0.0'
-]
-template = "../../.."
diff --git a/tests/apps/verify-pyside6/src/verify_pyside6/__init__.py b/tests/apps/verify-pyside6/src/verify_pyside6/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pyside6/src/verify_pyside6/__main__.py b/tests/apps/verify-pyside6/src/verify_pyside6/__main__.py
deleted file mode 100644
index 6de03ee..0000000
--- a/tests/apps/verify-pyside6/src/verify_pyside6/__main__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from verify_pyside6.app import main
-
-if __name__ == '__main__':
-    main()
diff --git a/tests/apps/verify-pyside6/src/verify_pyside6/app.py b/tests/apps/verify-pyside6/src/verify_pyside6/app.py
deleted file mode 100644
index 438c505..0000000
--- a/tests/apps/verify-pyside6/src/verify_pyside6/app.py
+++ /dev/null
@@ -1,44 +0,0 @@
-"""
-A PySide6 test app
-"""
-import sys
-
-try:
-    from importlib import metadata as importlib_metadata
-except ImportError:
-    # Backwards compatibility - importlib.metadata was added in Python 3.8
-    import importlib_metadata
-
-from PySide6 import QtWidgets
-
-
-class HelloPySide6(QtWidgets.QMainWindow):
-    def __init__(self):
-        super().__init__()
-        self.init_ui()
-
-    def init_ui(self):
-        self.setWindowTitle('verify-pyside6')
-        self.show()
-
-
-def main():
-    # Linux desktop environments use app's .desktop file to integrate the app
-    # to their application menus. The .desktop file of this app will include
-    # StartupWMClass key, set to app's formal name, which helps associate
-    # app's windows to its menu item.
-    #
-    # For association to work any windows of the app must have WMCLASS
-    # property set to match the value set in app's desktop file. For PySide2
-    # this is set with setApplicationName().
-
-    # Find the name of the module that was used to start the app
-    app_module = sys.modules['__main__'].__package__
-    # Retrieve the app's metadata
-    metadata = importlib_metadata.metadata(app_module)
-
-    QtWidgets.QApplication.setApplicationName(metadata['Formal-Name'])
-
-    app = QtWidgets.QApplication(sys.argv)
-    main_window = HelloPySide6()
-    sys.exit(app.exec())
diff --git a/tests/apps/verify-pyside6/src/verify_pyside6/resources/__init__.py b/tests/apps/verify-pyside6/src/verify_pyside6/resources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-pyside6/src/verify_pyside6/resources/verify-pyside6.icns b/tests/apps/verify-pyside6/src/verify_pyside6/resources/verify-pyside6.icns
deleted file mode 100644
index 27b43d3..0000000
Binary files a/tests/apps/verify-pyside6/src/verify_pyside6/resources/verify-pyside6.icns and /dev/null differ
diff --git a/tests/apps/verify-toga/pyproject.toml b/tests/apps/verify-toga/pyproject.toml
deleted file mode 100644
index 3785e47..0000000
--- a/tests/apps/verify-toga/pyproject.toml
+++ /dev/null
@@ -1,24 +0,0 @@
-[tool.briefcase]
-project_name = "Hello Toga"
-bundle = "org.beeware"
-version = "0.0.1"
-url = "https://beeware.org/"
-license = "BSD license"
-author = 'Brutus'
-author_email = "contact@beeware.org"
-
-[tool.briefcase.app.verify-toga]
-formal_name = "Hello Toga"
-description = "A Toga test app"
-icon = "src/verify_toga/resources/verify-toga"
-sources = ['src/verify_toga']
-requires = [
-]
-
-
-[tool.briefcase.app.verify-toga.macOS.Xcode]
-requires = [
-    'toga-cocoa~=0.4.0',
-    'std-nslog~=1.0.0'
-]
-template = "../../.."
diff --git a/tests/apps/verify-toga/src/verify_toga/__init__.py b/tests/apps/verify-toga/src/verify_toga/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-toga/src/verify_toga/__main__.py b/tests/apps/verify-toga/src/verify_toga/__main__.py
deleted file mode 100644
index b219363..0000000
--- a/tests/apps/verify-toga/src/verify_toga/__main__.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from verify_toga.app import main
-
-if __name__ == '__main__':
-    main().main_loop()
diff --git a/tests/apps/verify-toga/src/verify_toga/app.py b/tests/apps/verify-toga/src/verify_toga/app.py
deleted file mode 100644
index b609c38..0000000
--- a/tests/apps/verify-toga/src/verify_toga/app.py
+++ /dev/null
@@ -1,27 +0,0 @@
-"""
-A Toga test app
-"""
-import toga
-from toga.style import Pack
-from toga.style.pack import COLUMN, ROW
-
-
-class HelloToga(toga.App):
-
-    def startup(self):
-        """
-        Construct and show the Toga application.
-
-        Usually, you would add your application to a main content box.
-        We then create a main window (with a name matching the app), and
-        show the main window.
-        """
-        main_box = toga.Box()
-
-        self.main_window = toga.MainWindow(title=self.formal_name)
-        self.main_window.content = main_box
-        self.main_window.show()
-
-
-def main():
-    return HelloToga()
diff --git a/tests/apps/verify-toga/src/verify_toga/resources/__init__.py b/tests/apps/verify-toga/src/verify_toga/resources/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/tests/apps/verify-toga/src/verify_toga/resources/verify-toga.icns b/tests/apps/verify-toga/src/verify_toga/resources/verify-toga.icns
deleted file mode 100644
index 27b43d3..0000000
Binary files a/tests/apps/verify-toga/src/verify_toga/resources/verify-toga.icns and /dev/null differ