diff --git a/tests/check-shift-theme-identity.sh b/tests/check-shift-theme-identity.sh
index c78763ee..3e5ff476 100644
--- a/tests/check-shift-theme-identity.sh
+++ b/tests/check-shift-theme-identity.sh
@@ -91,8 +91,12 @@ require_line lookandfeel/contents/defaults '^name=shift-dark$' \
     "look-and-feel defaults must select the Shift dark Plasma desktop theme"
 require_line lookandfeel/contents/defaults '^theme=org\.shift\.decoration$' \
     "look-and-feel defaults must select org.shift.decoration"
+require_line lookandfeel/contents/defaults '^widgetStyle=Breeze$' \
+    "look-and-feel defaults must keep Breeze widget style until Shift ships a QQC2 style"
 reject_line lookandfeel/contents/defaults 'breeze-dark|breeze-light|breeze_cursors|org\.kde\.Breeze' \
     "look-and-feel defaults must not select Breeze desktop, cursor, or splash themes"
+reject_line lookandfeel/contents/defaults 'widgetStyle=Shift|widgetStyle=SHIFT|widgetStyle=org\.shift' \
+    "look-and-feel defaults must not reference a non-existent Shift widget style"
 
 [[ -f lookandfeel/contents/splash/Splash.qml ]] || fail "look-and-feel must provide a Shift splash implementation"
 reject_line lookandfeel/contents/logout/Logout.qml 'plasma_lookandfeel_org\.kde\.lookandfeel' \
@@ -115,6 +119,18 @@ require_line preview.sh 'PLASMA_THEME=shift-dark' \
     "preview dark mode must select the Shift dark Plasma desktop theme"
 reject_line preview.sh 'PLASMA_THEME=breeze-' \
     "preview must not select Breeze Plasma desktop themes"
+require_line preview.sh 'Shift does not ship a QQC2 style plugin yet' \
+    "preview must document the Breeze QQC2 fallback"
+require_line bin/startplasmamobile.in 'Shift does not ship a QQC2 style plugin yet' \
+    "runtime launcher must document the Breeze QQC2 fallback"
+require_line HACKING.md 'Shift does not ship a QQC2 style plugin yet' \
+    "HACKING.md must document the Breeze QQC2 fallback"
+require_line .kde-ci.yml 'plasma/qqc2-breeze-style' \
+    "CI must keep the Breeze QQC2 runtime dependency until Shift ships a QQC2 style"
+reject_line preview.sh 'QT_QUICK_CONTROLS_STYLE=org\.shift|QT_QUICK_CONTROLS_STYLE=SHIFT|QT_QUICK_CONTROLS_STYLE=Shift' \
+    "preview must not reference a non-existent Shift QQC2 style"
+reject_line bin/startplasmamobile.in 'QT_QUICK_CONTROLS_STYLE=org\.shift|QT_QUICK_CONTROLS_STYLE=SHIFT|QT_QUICK_CONTROLS_STYLE=Shift' \
+    "runtime launcher must not reference a non-existent Shift QQC2 style"
 
 generic_attribution_pattern='Shift contributor[s]|SHIFT Contributor[s]'