1 files changed, 105 insertions, 0 deletions
diff --git a/browser/components/shell/test/browser_420786.js b/browser/components/shell/test/browser_420786.js
new file mode 100644
index 0000000000..025cd87943
--- /dev/null
+++ b/browser/components/shell/test/browser_420786.js
@@ -0,0 +1,105 @@
+const DG_BACKGROUND = "/desktop/gnome/background";
+const DG_IMAGE_KEY = DG_BACKGROUND + "/picture_filename";
+const DG_OPTION_KEY = DG_BACKGROUND + "/picture_options";
+const DG_DRAW_BG_KEY = DG_BACKGROUND + "/draw_background";
+
+const GS_BG_SCHEMA = "org.gnome.desktop.background";
+const GS_IMAGE_KEY = "picture-uri";
+const GS_OPTION_KEY = "picture-options";
+const GS_DRAW_BG_KEY = "draw-background";
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "about:logo",
+    },
+    browser => {
+      var brandName = Services.strings
+        .createBundle("chrome://branding/locale/brand.properties")
+        .GetStringFromName("brandShortName");
+
+      var dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(
+        Ci.nsIDirectoryServiceProvider
+      );
+      var homeDir = dirSvc.getFile("Home", {});
+
+      var wpFile = homeDir.clone();
+      wpFile.append(brandName + "_wallpaper.png");
+
+      // Backup the existing wallpaper so that this test doesn't change the user's
+      // settings.
+      var wpFileBackup = homeDir.clone();
+      wpFileBackup.append(brandName + "_wallpaper.png.backup");
+
+      if (wpFileBackup.exists()) {
+        wpFileBackup.remove(false);
+      }
+
+      if (wpFile.exists()) {
+        wpFile.copyTo(null, wpFileBackup.leafName);
+      }
+
+      var shell = Cc["@mozilla.org/browser/shell-service;1"].getService(
+        Ci.nsIShellService
+      );
+
+      // For simplicity, we're going to reach in and access the image on the
+      // page directly, which means the page shouldn't be running in a remote
+      // browser. Thankfully, about:logo runs in the parent process for now.
+      Assert.ok(
+        !gBrowser.selectedBrowser.isRemoteBrowser,
+        "image can be accessed synchronously from the parent process"
+      );
+
+      var image = content.document.images[0];
+
+      let checkWallpaper, restoreSettings;
+      try {
+        // Try via GSettings first
+        const gsettings = Cc["@mozilla.org/gsettings-service;1"]
+          .getService(Ci.nsIGSettingsService)
+          .getCollectionForSchema(GS_BG_SCHEMA);
+
+        const prevImage = gsettings.getString(GS_IMAGE_KEY);
+        const prevOption = gsettings.getString(GS_OPTION_KEY);
+        const prevDrawBG = gsettings.getBoolean(GS_DRAW_BG_KEY);
+
+        checkWallpaper = function (position, expectedGSettingsPosition) {
+          shell.setDesktopBackground(image, position, "");
+          ok(wpFile.exists(), "Wallpaper was written to disk");
+          is(
+            gsettings.getString(GS_IMAGE_KEY),
+            encodeURI("file://" + wpFile.path),
+            "Wallpaper file GSettings key is correct"
+          );
+          is(
+            gsettings.getString(GS_OPTION_KEY),
+            expectedGSettingsPosition,
+            "Wallpaper position GSettings key is correct"
+          );
+        };
+
+        restoreSettings = function () {
+          gsettings.setString(GS_IMAGE_KEY, prevImage);
+          gsettings.setString(GS_OPTION_KEY, prevOption);
+          gsettings.setBoolean(GS_DRAW_BG_KEY, prevDrawBG);
+        };
+      } catch (e) {}
+
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_TILE, "wallpaper");
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_STRETCH, "stretched");
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_CENTER, "centered");
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_FILL, "zoom");
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_FIT, "scaled");
+      checkWallpaper(Ci.nsIShellService.BACKGROUND_SPAN, "spanned");
+
+      restoreSettings();
+
+      // Restore files
+      if (wpFileBackup.exists()) {
+        wpFileBackup.moveTo(null, wpFile.leafName);
+      }
+    }
+  );
+});