Add integration tests of QueryDiscovery

extensions/ql-vscode/src/queries-panel/query-discovery.ts

@@ -12,7 +12,7 @@ import { QueryDiscoverer } from "./query-tree-data-provider";
 /**
  * The results of discovering queries.
  */
-interface QueryDiscoveryResults {
+export interface QueryDiscoveryResults {
   /**
    * A tree of directories and query files.
    * May have multiple roots because of multiple workspaces.
@@ -99,22 +99,26 @@ export class QueryDiscovery
   ): Promise<FileTreeDirectory[]> {
     const rootDirectories = [];
     for (const workspaceFolder of workspaceFolders) {
-      rootDirectories.push(
-        await this.discoverQueriesInWorkspace(workspaceFolder),
-      );
+      const root = await this.discoverQueriesInWorkspace(workspaceFolder);
+      if (root !== undefined) {
+        rootDirectories.push(root);
+      }
     }
     return rootDirectories;
   }
 
   private async discoverQueriesInWorkspace(
     workspaceFolder: WorkspaceFolder,
-  ): Promise<FileTreeDirectory> {
+  ): Promise<FileTreeDirectory | undefined> {
     const fullPath = workspaceFolder.uri.fsPath;
     const name = workspaceFolder.name;
 
-    const rootDirectory = new FileTreeDirectory(fullPath, name);
-
     const resolvedQueries = await this.cliServer.resolveQueries(fullPath);
+    if (resolvedQueries.length === 0) {
+      return undefined;
+    }
+
+    const rootDirectory = new FileTreeDirectory(fullPath, name);
     for (const queryPath of resolvedQueries) {
       const relativePath = normalize(relative(fullPath, queryPath));
       const dirName = dirname(relativePath);

extensions/ql-vscode/test/vscode-tests/minimal-workspace/queries-panel/query-discovery.test.ts

@@ -0,0 +1,225 @@
+import {
+  EventEmitter,
+  FileSystemWatcher,
+  Uri,
+  WorkspaceFoldersChangeEvent,
+  workspace,
+} from "vscode";
+import { CodeQLCliServer } from "../../../../src/codeql-cli/cli";
+import {
+  QueryDiscovery,
+  QueryDiscoveryResults,
+} from "../../../../src/queries-panel/query-discovery";
+import { createMockApp } from "../../../__mocks__/appMock";
+import { mockedObject } from "../../utils/mocking.helpers";
+import { basename, join, sep } from "path";
+import { sleep } from "../../../../src/pure/time";
+
+describe("QueryDiscovery", () => {
+  beforeEach(() => {
+    expect(workspace.workspaceFolders?.length).toEqual(1);
+  });
+
+  describe("queries", () => {
+    it("should return empty list when no QL files are present", async () => {
+      const resolveQueries = jest.fn().mockResolvedValue([]);
+      const cli = mockedObject<CodeQLCliServer>({
+        resolveQueries,
+      });
+
+      const discovery = new QueryDiscovery(createMockApp({}), cli);
+      const results: QueryDiscoveryResults = await (
+        discovery as any
+      ).discover();
+
+      expect(results.queries).toEqual([]);
+      expect(resolveQueries).toHaveBeenCalledTimes(1);
+    });
+
+    it("should organise query files into directories", async () => {
+      const workspaceRoot = workspace.workspaceFolders![0].uri.fsPath;
+      const cli = mockedObject<CodeQLCliServer>({
+        resolveQueries: jest
+          .fn()
+          .mockResolvedValue([
+            join(workspaceRoot, "dir1/query1.ql"),
+            join(workspaceRoot, "dir2/query2.ql"),
+            join(workspaceRoot, "query3.ql"),
+          ]),
+      });
+
+      const discovery = new QueryDiscovery(createMockApp({}), cli);
+      const results: QueryDiscoveryResults = await (
+        discovery as any
+      ).discover();
+
+      expect(results.queries[0].children.length).toEqual(3);
+      expect(results.queries[0].children[0].name).toEqual("dir1");
+      expect(results.queries[0].children[0].children.length).toEqual(1);
+      expect(results.queries[0].children[0].children[0].name).toEqual(
+        "query1.ql",
+      );
+      expect(results.queries[0].children[1].name).toEqual("dir2");
+      expect(results.queries[0].children[1].children.length).toEqual(1);
+      expect(results.queries[0].children[1].children[0].name).toEqual(
+        "query2.ql",
+      );
+      expect(results.queries[0].children[2].name).toEqual("query3.ql");
+    });
+
+    it("should collapse directories containing only a single element", async () => {
+      const workspaceRoot = workspace.workspaceFolders![0].uri.fsPath;
+      const cli = mockedObject<CodeQLCliServer>({
+        resolveQueries: jest
+          .fn()
+          .mockResolvedValue([
+            join(workspaceRoot, "dir1/query1.ql"),
+            join(workspaceRoot, "dir1/dir2/dir3/dir3/query2.ql"),
+          ]),
+      });
+
+      const discovery = new QueryDiscovery(createMockApp({}), cli);
+      const results: QueryDiscoveryResults = await (
+        discovery as any
+      ).discover();
+
+      expect(results.queries[0].children.length).toEqual(1);
+      expect(results.queries[0].children[0].name).toEqual("dir1");
+      expect(results.queries[0].children[0].children.length).toEqual(2);
+      expect(results.queries[0].children[0].children[0].name).toEqual(
+        "dir2 / dir3 / dir3",
+      );
+      expect(
+        results.queries[0].children[0].children[0].children.length,
+      ).toEqual(1);
+      expect(
+        results.queries[0].children[0].children[0].children[0].name,
+      ).toEqual("query2.ql");
+      expect(results.queries[0].children[0].children[1].name).toEqual(
+        "query1.ql",
+      );
+    });
+
+    it("calls resolveQueries once for each workspace folder", async () => {
+      const workspaceRoots = [
+        `${sep}workspace1`,
+        `${sep}workspace2`,
+        `${sep}workspace3`,
+      ];
+      jest.spyOn(workspace, "workspaceFolders", "get").mockReturnValueOnce(
+        workspaceRoots.map((root, index) => ({
+          uri: Uri.file(root),
+          name: basename(root),
+          index,
+        })),
+      );
+
+      const resolveQueries = jest.fn().mockImplementation((queryDir) => {
+        const workspaceIndex = workspaceRoots.indexOf(queryDir);
+        if (workspaceIndex === -1) {
+          throw new Error("Unexpected workspace");
+        }
+        return Promise.resolve([
+          join(queryDir, `query${workspaceIndex + 1}.ql`),
+        ]);
+      });
+      const cli = mockedObject<CodeQLCliServer>({
+        resolveQueries,
+      });
+
+      const discovery = new QueryDiscovery(createMockApp({}), cli);
+      const results: QueryDiscoveryResults = await (
+        discovery as any
+      ).discover();
+
+      expect(results.queries.length).toEqual(3);
+      expect(results.queries[0].children[0].name).toEqual("query1.ql");
+      expect(results.queries[1].children[0].name).toEqual("query2.ql");
+      expect(results.queries[2].children[0].name).toEqual("query3.ql");
+
+      expect(resolveQueries).toHaveBeenCalledTimes(3);
+    });
+  });
+
+  describe("onDidChangeQueries", () => {
+    it("should fire onDidChangeQueries when a watcher fires", async () => {
+      const onWatcherDidChangeEvent = new EventEmitter<Uri>();
+      const watcher: FileSystemWatcher = {
+        ignoreCreateEvents: false,
+        ignoreChangeEvents: false,
+        ignoreDeleteEvents: false,
+        onDidCreate: onWatcherDidChangeEvent.event,
+        onDidChange: onWatcherDidChangeEvent.event,
+        onDidDelete: onWatcherDidChangeEvent.event,
+        dispose: () => undefined,
+      };
+      const createFileSystemWatcherSpy = jest.spyOn(
+        workspace,
+        "createFileSystemWatcher",
+      );
+      createFileSystemWatcherSpy.mockReturnValue(watcher);
+
+      const workspaceRoot = workspace.workspaceFolders![0].uri.fsPath;
+      const cli = mockedObject<CodeQLCliServer>({
+        resolveQueries: jest
+          .fn()
+          .mockResolvedValue([join(workspaceRoot, "query1.ql")]),
+      });
+
+      const discovery = new QueryDiscovery(
+        createMockApp({
+          createEventEmitter: () => new EventEmitter(),
+        }),
+        cli,
+      );
+
+      const onDidChangeQueriesSpy = jest.fn();
+      discovery.onDidChangeQueries(onDidChangeQueriesSpy);
+
+      const results = await (discovery as any).discover();
+      (discovery as any).update(results);
+
+      expect(createFileSystemWatcherSpy).toHaveBeenCalledTimes(2);
+      expect(onDidChangeQueriesSpy).toHaveBeenCalledTimes(1);
+
+      onWatcherDidChangeEvent.fire(workspace.workspaceFolders![0].uri);
+
+      // Wait for refresh to finish
+      await sleep(100);
+
+      expect(onDidChangeQueriesSpy).toHaveBeenCalledTimes(2);
+    });
+  });
+
+  describe("onDidChangeWorkspaceFolders", () => {
+    it("should refresh when workspace folders change", async () => {
+      const onDidChangeWorkspaceFoldersEvent =
+        new EventEmitter<WorkspaceFoldersChangeEvent>();
+
+      const discovery = new QueryDiscovery(
+        createMockApp({
+          createEventEmitter: () => new EventEmitter(),
+          onDidChangeWorkspaceFolders: onDidChangeWorkspaceFoldersEvent.event,
+        }),
+        mockedObject<CodeQLCliServer>({
+          resolveQueries: jest.fn().mockResolvedValue([]),
+        }),
+      );
+
+      const onDidChangeQueriesSpy = jest.fn();
+      discovery.onDidChangeQueries(onDidChangeQueriesSpy);
+
+      const results = await (discovery as any).discover();
+      (discovery as any).update(results);
+
+      expect(onDidChangeQueriesSpy).toHaveBeenCalledTimes(1);
+
+      onDidChangeWorkspaceFoldersEvent.fire({ added: [], removed: [] });
+
+      // Wait for refresh to finish
+      await sleep(100);
+
+      expect(onDidChangeQueriesSpy).toHaveBeenCalledTimes(2);
+    });
+  });
+});