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The successor of a tab is similar to the owner of a tab, in that if an active tab is closed, the successor will be activated next. The differences are that successor always defaults to being unset (an extension can set it through a not-yet-implemented API), whereas tabbrowser sets owner to be the opener of background tabs; successor is always consulted when an active tab is closed, whereas the use of owner is gated by a pref; and when a tab is closed, hidden, or moved to another window, any tabs whose successor is the affected tab inherit that tab's successor, whereas in the parallel situation with owners, the owner of such tabs is simply set to null. Differential Revision: https://phabricator.services.mozilla.com/D4731 --HG-- extra : moz-landing-system : lando
96 lines
3.6 KiB
JavaScript
96 lines
3.6 KiB
JavaScript
add_task(async function test() {
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const tabs = [gBrowser.selectedTab];
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for (let i = 0; i < 6; ++i) {
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tabs.push(BrowserTestUtils.addTab(gBrowser));
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}
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// Check that setSuccessor works.
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gBrowser.setSuccessor(tabs[0], tabs[2]);
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is(tabs[0].successor, tabs[2], "setSuccessor sets successor");
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ok(tabs[2].predecessors.has(tabs[0]), "setSuccessor adds predecessor");
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BrowserTestUtils.removeTab(tabs[0]);
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is(gBrowser.selectedTab, tabs[2], "When closing a selected tab, select its successor");
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// Check that the successor of a hidden tab becomes the successor of the
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// tab's predecessors.
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gBrowser.setSuccessor(tabs[1], tabs[2]);
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gBrowser.setSuccessor(tabs[3], tabs[1]);
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ok(!tabs[2].predecessors.has(tabs[3]));
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gBrowser.hideTab(tabs[1]);
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is(tabs[3].successor, tabs[2], "A predecessor of a hidden tab should take as its successor the hidden tab's successor");
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ok(tabs[2].predecessors.has(tabs[3]));
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gBrowser.showTab(tabs[1]);
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// Check that the successor of a closed tab also becomes the successor of the
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// tab's predecessors.
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gBrowser.setSuccessor(tabs[1], tabs[2]);
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gBrowser.setSuccessor(tabs[3], tabs[1]);
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ok(!tabs[2].predecessors.has(tabs[3]));
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BrowserTestUtils.removeTab(tabs[1]);
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is(tabs[3].successor, tabs[2], "A predecessor of a closed tab should take as its successor the closed tab's successor");
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ok(tabs[2].predecessors.has(tabs[3]));
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// Check that clearing a successor makes the browser fall back to selecting
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// the owner or next tab.
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await BrowserTestUtils.switchTab(gBrowser, tabs[3]);
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gBrowser.setSuccessor(tabs[3], null);
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is(tabs[3].successor, null, "setSuccessor(..., null) should clear successor");
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ok(!tabs[2].predecessors.has(tabs[3]), "setSuccessor(..., null) should remove the old successor from predecessors");
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BrowserTestUtils.removeTab(tabs[3]);
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is(gBrowser.selectedTab, tabs[4], "When the active tab is closed and its successor has been cleared, select the next tab");
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// Like closing or hiding a tab, moving a tab to another window should also
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// result in its successor becoming the successor of the moved tab's
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// predecessors.
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gBrowser.setSuccessor(tabs[4], tabs[2]);
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gBrowser.setSuccessor(tabs[2], tabs[5]);
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const secondWin = gBrowser.replaceTabsWithWindow(tabs[2]);
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await TestUtils.waitForCondition(() => tabs[2].closing, "Wait for tab to be transferred");
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is(tabs[4].successor, tabs[5], "A predecessor of a tab moved to another window should take as its successor the moved tab's successor");
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// Trying to set a successor across windows should fail.
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let threw = false;
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try {
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gBrowser.setSuccessor(tabs[4], secondWin.gBrowser.selectedTab);
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} catch (ex) {
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threw = true;
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}
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ok(threw, "No cross window successors");
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is(tabs[4].successor, tabs[5], "Successor should remain unchanged");
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threw = false;
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try {
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secondWin.gBrowser.setSuccessor(tabs[4], null);
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} catch (ex) {
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threw = true;
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}
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ok(threw, "No setting successors for another window's tab");
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is(tabs[4].successor, tabs[5], "Successor should remain unchanged");
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BrowserTestUtils.closeWindow(secondWin);
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// A tab can't be its own successor
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gBrowser.setSuccessor(tabs[4], tabs[4]);
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is(tabs[4].successor, null, "Successor should be cleared instead of pointing to itself");
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gBrowser.setSuccessor(tabs[4], tabs[5]);
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gBrowser.setSuccessor(tabs[5], tabs[4]);
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is(tabs[4].successor, tabs[5], "Successors can form cycles of length > 1 [a]");
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is(tabs[5].successor, tabs[4], "Successors can form cycles of length > 1 [b]");
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BrowserTestUtils.removeTab(tabs[5]);
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is(tabs[4].successor, null, "Successor should be cleared instead of pointing to itself");
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gBrowser.removeTab(tabs[4]);
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});
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