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diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_webextension_icons.js b/toolkit/mozapps/extensions/test/xpcshell/test_webextension_icons.js
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+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+const ID = "webextension1@tests.mozilla.org";
+
+const profileDir = gProfD.clone();
+profileDir.append("extensions");
+profileDir.create(AM_Ci.nsIFile.DIRECTORY_TYPE, FileUtils.PERMS_DIRECTORY);
+
+createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "42");
+startupManager();
+
+const { Management } = Components.utils.import("resource://gre/modules/Extension.jsm", {});
+
+function promiseAddonStartup() {
+ return new Promise(resolve => {
+ let listener = (evt, extension) => {
+ Management.off("startup", listener);
+ resolve(extension);
+ };
+
+ Management.on("startup", listener);
+ });
+}
+
+// Test simple icon set parsing
+add_task(function*() {
+ yield promiseWriteWebManifestForExtension({
+ name: "Web Extension Name",
+ version: "1.0",
+ manifest_version: 2,
+ applications: {
+ gecko: {
+ id: ID
+ }
+ },
+ icons: {
+ 16: "icon16.png",
+ 32: "icon32.png",
+ 48: "icon48.png",
+ 64: "icon64.png"
+ }
+ }, profileDir);
+
+ yield promiseRestartManager();
+ yield promiseAddonStartup();
+
+ let uri = do_get_addon_root_uri(profileDir, ID);
+
+ let addon = yield promiseAddonByID(ID);
+ do_check_neq(addon, null);
+
+ function check_icons(addon_copy) {
+ deepEqual(addon_copy.icons, {
+ 16: uri + "icon16.png",
+ 32: uri + "icon32.png",
+ 48: uri + "icon48.png",
+ 64: uri + "icon64.png"
+ });
+
+ // iconURL should map to icons[48] and icons[64]
+ equal(addon.iconURL, uri + "icon48.png");
+ equal(addon.icon64URL, uri + "icon64.png");
+
+ // AddonManager gets the correct icon sizes from addon.icons
+ equal(AddonManager.getPreferredIconURL(addon, 1), uri + "icon16.png");
+ equal(AddonManager.getPreferredIconURL(addon, 16), uri + "icon16.png");
+ equal(AddonManager.getPreferredIconURL(addon, 30), uri + "icon32.png");
+ equal(AddonManager.getPreferredIconURL(addon, 48), uri + "icon48.png");
+ equal(AddonManager.getPreferredIconURL(addon, 64), uri + "icon64.png");
+ equal(AddonManager.getPreferredIconURL(addon, 128), uri + "icon64.png");
+ }
+
+ check_icons(addon);
+
+ // check if icons are persisted through a restart
+ yield promiseRestartManager();
+ yield promiseAddonStartup();
+
+ addon = yield promiseAddonByID(ID);
+ do_check_neq(addon, null);
+
+ check_icons(addon);
+
+ addon.uninstall();
+
+ yield promiseRestartManager();
+});
+
+// Test AddonManager.getPreferredIconURL for retina screen sizes
+add_task(function*() {
+ yield promiseWriteWebManifestForExtension({
+ name: "Web Extension Name",
+ version: "1.0",
+ manifest_version: 2,
+ applications: {
+ gecko: {
+ id: ID
+ }
+ },
+ icons: {
+ 32: "icon32.png",
+ 48: "icon48.png",
+ 64: "icon64.png",
+ 128: "icon128.png",
+ 256: "icon256.png"
+ }
+ }, profileDir);
+
+ yield promiseRestartManager();
+ yield promiseAddonStartup();
+
+ let addon = yield promiseAddonByID(ID);
+ do_check_neq(addon, null);
+
+ let uri = do_get_addon_root_uri(profileDir, ID);
+
+ // AddonManager displays larger icons for higher pixel density
+ equal(AddonManager.getPreferredIconURL(addon, 32, {
+ devicePixelRatio: 2
+ }), uri + "icon64.png");
+
+ equal(AddonManager.getPreferredIconURL(addon, 48, {
+ devicePixelRatio: 2
+ }), uri + "icon128.png");
+
+ equal(AddonManager.getPreferredIconURL(addon, 64, {
+ devicePixelRatio: 2
+ }), uri + "icon128.png");
+
+ addon.uninstall();
+
+ yield promiseRestartManager();
+});
+
+// Handles no icons gracefully
+add_task(function*() {
+ yield promiseWriteWebManifestForExtension({
+ name: "Web Extension Name",
+ version: "1.0",
+ manifest_version: 2,
+ applications: {
+ gecko: {
+ id: ID
+ }
+ }
+ }, profileDir);
+
+ yield promiseRestartManager();
+ yield promiseAddonStartup();
+
+ let addon = yield promiseAddonByID(ID);
+ do_check_neq(addon, null);
+
+ let uri = do_get_addon_root_uri(profileDir, ID);
+
+ deepEqual(addon.icons, {});
+
+ equal(addon.iconURL, null);
+ equal(addon.icon64URL, null);
+
+ equal(AddonManager.getPreferredIconURL(addon, 128), null);
+
+ addon.uninstall();
+
+ yield promiseRestartManager();
+});
+