Add db config factory function and use it in tests (#1859)

Author: charisk

extensions/ql-vscode/test/factories/db-config-factories.ts

@@ -0,0 +1,42 @@
+import {
+  DbConfig,
+  ExpandedDbItem,
+  LocalDatabase,
+  LocalList,
+  RemoteRepositoryList,
+  SelectedDbItem,
+} from "../../src/databases/config/db-config";
+
+export function createDbConfig({
+  remoteLists = [],
+  remoteOwners = [],
+  remoteRepos = [],
+  localLists = [],
+  localDbs = [],
+  selected = undefined,
+  expanded = [],
+}: {
+  remoteLists?: RemoteRepositoryList[];
+  remoteOwners?: string[];
+  remoteRepos?: string[];
+  localLists?: LocalList[];
+  localDbs?: LocalDatabase[];
+  selected?: SelectedDbItem;
+  expanded?: ExpandedDbItem[];
+} = {}): DbConfig {
+  return {
+    databases: {
+      remote: {
+        repositoryLists: remoteLists,
+        owners: remoteOwners,
+        repositories: remoteRepos,
+      },
+      local: {
+        lists: localLists,
+        databases: localDbs,
+      },
+    },
+    expanded,
+    selected,
+  };
+}