Release Vulpes OS 2.7-preview.22

tests/view-visibility.test.mjs

@@ -0,0 +1,36 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {frameUnobscured} from '../services/view-visibility.mjs';
+
+function scene(width, hostname = 'system.localhost') {
+  const frame = {};
+  const edge = {matches: selector => selector.includes('.gesture-panel')};
+  const document = {hidden:false, location:{hostname},
+    elementFromPoint: x => x < 20 || x > width - 20 ? edge : frame};
+  return {frame, document, rect:{left:0, top:74, width, height:622}};
+}
+
+test('Gaia edge gestures do not hide the web page on narrow screens', () => {
+  for (const width of [320,360,414]) {
+    const {document,frame,rect}=scene(width);
+    assert.equal(frameUnobscured(document,frame,rect),true);
+  }
+});
+
+test('an application cannot impersonate the system gesture overlay', () => {
+  const {document,frame,rect}=scene(360,'example.localhost');
+  assert.equal(frameUnobscured(document,frame,rect),false);
+});
+
+test('dialogs, missing hit targets and hidden documents still hide external views', () => {
+  const {document,frame,rect}=scene(360);
+  for (const hit of [{matches:()=>false},null]) {
+    document.elementFromPoint=()=>hit;
+    assert.equal(frameUnobscured(document,frame,rect),false);
+  }
+  document.elementFromPoint=()=>frame;
+  document.hidden=true;
+  assert.equal(frameUnobscured(document,frame,rect),false);
+  document.hidden=false;
+  assert.equal(frameUnobscured(document,frame,{...rect,width:0}),false);
+});