Add a QueryDiscoverer interface to make testing QueryTreeDataProvider easier

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

@@ -7,6 +7,7 @@ import { App } from "../common/app";
 import { FileTreeDirectory, FileTreeLeaf } from "../common/file-tree-nodes";
 import { getOnDiskWorkspaceFoldersObjects } from "../helpers";
 import { AppEventEmitter } from "../common/events";
+import { QueryDiscoverer } from "./query-tree-data-provider";
 
 /**
  * The results of discovering queries.
@@ -28,7 +29,10 @@ interface QueryDiscoveryResults {
 /**
  * Discovers all query files contained in the QL packs in a given workspace folder.
  */
-export class QueryDiscovery extends Discovery<QueryDiscoveryResults> {
+export class QueryDiscovery
+  extends Discovery<QueryDiscoveryResults>
+  implements QueryDiscoverer
+{
   private results: QueryDiscoveryResults | undefined;
 
   private readonly onDidChangeQueriesEmitter: AppEventEmitter<void>;

extensions/ql-vscode/src/queries-panel/query-tree-data-provider.ts

@@ -1,9 +1,13 @@
 import { Event, EventEmitter, TreeDataProvider, TreeItem } from "vscode";
 import { QueryTreeViewItem } from "./query-tree-view-item";
 import { DisposableObject } from "../pure/disposable-object";
-import { QueryDiscovery } from "./query-discovery";
 import { FileTreeNode } from "../common/file-tree-nodes";
 
+export interface QueryDiscoverer {
+  readonly queries: FileTreeNode[] | undefined;
+  readonly onDidChangeQueries: Event<void>;
+}
+
 export class QueryTreeDataProvider
   extends DisposableObject
   implements TreeDataProvider<QueryTreeViewItem>
@@ -14,10 +18,10 @@ export class QueryTreeDataProvider
     new EventEmitter<void>(),
   );
 
-  public constructor(private readonly queryDiscovery: QueryDiscovery) {
+  public constructor(private readonly queryDiscoverer: QueryDiscoverer) {
     super();
 
-    queryDiscovery.onDidChangeQueries(() => {
+    queryDiscoverer.onDidChangeQueries(() => {
       this.queryTreeItems = this.createTree();
       this.onDidChangeTreeDataEmitter.fire();
     });
@@ -30,7 +34,7 @@ export class QueryTreeDataProvider
   }
 
   private createTree(): QueryTreeViewItem[] {
-    return (this.queryDiscovery.queries || []).map(
+    return (this.queryDiscoverer.queries || []).map(
       this.convertFileTreeNode.bind(this),
     );
   }