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diff --git a/test/webhelper/testWebActions2.js b/test/webhelper/testWebActions2.js
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+const Gio = imports.gi.Gio;
+const Gtk = imports.gi.Gtk;
+const Lang = imports.lang;
+const Mainloop = imports.mainloop;
+const WebHelper2 = imports.webhelper2;
+const WebKit2 = imports.gi.WebKit2;
+
+const WELL_KNOWN_NAME = 'com.endlessm.WebHelper.testWebActions2';
+
+Gtk.init(null);
+
+describe('WebKit2 actions bindings', function () {
+    let owner_id, connection, webview, webhelper, web_action_spy;
+
+    beforeAll(function (done) {
+        owner_id = Gio.DBus.own_name(Gio.BusType.SESSION, WELL_KNOWN_NAME,
+            Gio.BusNameOwnerFlags.NONE,
+            null,  // bus acquired
+            (con, name) => {  // name acquired
+                connection = con;
+                done();
+            },
+            null);  // name lost
+    });
+
+    afterAll(function () {
+        Gio.DBus.unown_name(owner_id);
+    });
+
+    function run_loop(action_to_test) {
+        let string = '<html><head><meta http-equiv="refresh" content="0;url=' +
+            action_to_test + '"></head><body></body></html>';
+        webview.load_html(string, null);
+        Mainloop.run('webhelper2');
+    }
+
+    beforeEach(function () {
+        webhelper = new WebHelper2.WebHelper({
+            well_known_name: WELL_KNOWN_NAME,
+            connection: connection,
+        });
+        webview = new WebKit2.WebView();
+        web_action_spy = jasmine.createSpy('web_action_spy').and.callFake(() =>
+            Mainloop.quit('webhelper2'));
+        webhelper.define_web_action('action', web_action_spy);
+    });
+
+    afterEach(function () {
+        webhelper.unregister();
+    });
+
+    it('calls a web action', function () {
+        run_loop('webhelper://action');
+        expect(web_action_spy).toHaveBeenCalled();
+    });
+
+    it('calls a web action with a parameter', function () {
+        run_loop('webhelper://action?param=value');
+        expect(web_action_spy).toHaveBeenCalledWith(jasmine.objectContaining({
+            param: 'value',
+        }));
+    });
+
+    it('calls a web action with many parameters', function () {
+        run_loop('webhelper://action?first=thefirst&second=thesecond&third=thethird');
+        expect(web_action_spy).toHaveBeenCalledWith(jasmine.objectContaining({
+            first: 'thefirst',
+            second: 'thesecond',
+            third: 'thethird',
+        }));
+    });
+
+    it('uri-decodes parameter names', function () {
+        run_loop('webhelper://action?p%C3%A4r%C3%A4m%F0%9F%92%A9=value');
+        expect(web_action_spy).toHaveBeenCalledWith(jasmine.objectContaining({
+            'päräm💩': 'value',
+        }));
+    });
+
+    it('uri-decodes parameter values', function () {
+        run_loop('webhelper://action?param=v%C3%A1lu%C3%A9%F0%9F%92%A9');
+        expect(web_action_spy).toHaveBeenCalledWith(jasmine.objectContaining({
+            param: 'válué💩',
+        }));
+    });
+
+    // This is commented out because GJS cannot catch exceptions across FFI
+    // interfaces (e.g. in GObject callbacks.)
+    xit('raises an exception on a nonexistent action instead of calling it', function () {
+        expect(function () {
+            run_loop('webhelper://nonexistentAction?param=value');
+        }).toThrow();
+    });
+
+    it('calls a web action with a blank parameter', function () {
+        run_loop('webhelper://action?param=');
+        expect(web_action_spy).toHaveBeenCalledWith(jasmine.objectContaining({
+            param: '',
+        }));
+    });
+
+    it('uri-decodes web action names', function () {
+        webhelper.define_web_action('äction💩Quit', web_action_spy);
+        run_loop('webhelper://%C3%A4ction%F0%9F%92%A9Quit');
+        expect(web_action_spy).toHaveBeenCalled();
+    });
+
+    it('can define more than one action with define_web_actions()', function () {
+        webhelper.define_web_actions({
+            action2: web_action_spy,
+        });
+        run_loop('webhelper://action2');
+        expect(web_action_spy).toBeTruthy();
+    });
+
+    it('complains when defining an action that is not a function', function () {
+        expect(function () {
+            webhelper.define_web_action('badAction', 'not a function');
+        }).toThrow();
+    });
+});