Add unit test for PDF recognition with DOI

Also some support code that was useful here and will probably be
useful for other tests. This is a pretty complicated thing to test, but
it seems to work.

test/content/support.js

@@ -0,0 +1,111 @@
+/**
+ * Open a window. Returns a promise for the window.
+ */
+function loadWindow(winurl, argument) {
+	var deferred = Q.defer();
+	var win = window.openDialog(winurl, "_blank", "chrome", argument);
+	var func = function() {
+		win.removeEventListener("load", func, false);
+		deferred.resolve(win);
+	};
+	win.addEventListener("load", func, false);
+	return deferred.promise;
+}
+
+/**
+ * Loads a Zotero pane in a new window. Returns the containing window.
+ */
+function loadZoteroPane() {
+	return loadWindow("chrome://browser/content/browser.xul").then(function(win) {
+		win.ZoteroOverlay.toggleDisplay(true);
+
+		// Hack to wait for pane load to finish. This is the same hack
+		// we use in ZoteroPane.js, so either it's not good enough
+		// there or it should be good enough here.
+		return Q.delay(52).then(function() {
+			return win;
+		});
+	});
+}
+
+/**
+ * Waits for a window with a specific URL to open. Returns a promise for the window.
+ */
+function waitForWindow(uri) {
+	var deferred = Q.defer();
+	Components.utils.import("resource://gre/modules/Services.jsm");
+	var loadobserver = function(ev) {
+		ev.originalTarget.removeEventListener("load", loadobserver, false);
+		if(ev.target.location == uri) {
+			Services.ww.unregisterNotification(winobserver);
+			deferred.resolve(ev.target.docShell.QueryInterface(Components.interfaces.nsIInterfaceRequestor).
+				             getInterface(Components.interfaces.nsIDOMWindow));
+		}
+	};
+	var winobserver = {"observe":function(subject, topic, data) {
+		if(topic != "domwindowopened") return;
+		var win = subject.QueryInterface(Components.interfaces.nsIDOMWindow);
+		win.addEventListener("load", loadobserver, false);
+	}};
+	var enumerator = Services.ww.registerNotification(winobserver);
+	return deferred.promise;
+}
+
+/**
+ * Waits for a single item event. Returns a promise for the item ID(s).
+ */
+function waitForItemEvent(event) {
+	var deferred = Q.defer();
+	var notifierID = Zotero.Notifier.registerObserver({notify:function(ev, type, ids, extraData) {
+		if(ev == event) {
+			Zotero.Notifier.unregisterObserver(notifierID);
+			deferred.resolve(ids);
+		}
+	}}, ["item"]);
+	return deferred.promise;
+}
+
+/**
+ * Ensures that the PDF tools are installed, or installs them if not. Returns a promise.
+ */
+function installPDFTools() {
+	if(Zotero.Fulltext.pdfConverterIsRegistered() && Zotero.Fulltext.pdfInfoIsRegistered()) {
+		return Q(true);
+	}
+
+	// Begin install procedure
+	return loadWindow("chrome://zotero/content/preferences/preferences.xul", {
+		pane: 'zotero-prefpane-search',
+		action: 'pdftools-install'
+	}).then(function(win) {
+		// Wait for confirmation dialog
+		return waitForWindow("chrome://global/content/commonDialog.xul").then(function(dlg) {
+			// Accept confirmation dialog
+			dlg.document.documentElement.acceptDialog();
+
+			// Wait for install to finish
+			var deferred = Q.defer();
+			var id = setInterval(function() {
+				if(Zotero.Fulltext.pdfConverterIsRegistered() && Zotero.Fulltext.pdfInfoIsRegistered()) {
+					win.close();
+					clearInterval(id);
+					deferred.resolve(true);
+				}
+			}, 500);
+			return deferred.promise;
+		});
+	});
+}
+
+/**
+ * Returns a promise for the nsIFile corresponding to the test data
+ * directory (i.e., test/tests/data)
+ */
+function getTestDataDirectory() {
+	Components.utils.import("resource://gre/modules/Services.jsm");
+	var resource = Services.io.getProtocolHandler("resource").
+	               QueryInterface(Components.interfaces.nsIResProtocolHandler),
+	    resURI = Services.io.newURI("resource://zotero-unit-tests/data", null, null);
+	return Services.io.newURI(resource.resolveURI(resURI), null, null).
+	       QueryInterface(Components.interfaces.nsIFileURL).file;
+}