Added unit test

src/testRunner/tests.ts

@@ -199,6 +199,7 @@ export * from "./unittests/tsserver/partialSemanticServer.js";
 export * from "./unittests/tsserver/pasteEdits.js";
 export * from "./unittests/tsserver/plugins.js";
 export * from "./unittests/tsserver/pluginsAsync.js";
+export * from "./unittests/tsserver/projectImportHelpers.js";
 export * from "./unittests/tsserver/projectErrors.js";
 export * from "./unittests/tsserver/projectReferenceCompileOnSave.js";
 export * from "./unittests/tsserver/projectReferenceErrors.js";

src/testRunner/unittests/tsserver/projectImportHelpers.ts

@@ -0,0 +1,76 @@
+import * as ts from "../../_namespaces/ts.js";
+import { jsonToReadableText } from "../helpers.js";
+import {
+    baselineTsserverLogs,
+    openFilesForSession,
+    TestSession,
+} from "../helpers/tsserver.js";
+import {
+    createServerHost,
+} from "../helpers/virtualFileSystemWithWatch.js";
+
+describe("unittests:: tsserver:: projectImportHelpers::", () => {
+    it("import helpers sucessfully", () => {
+        const type1 = {
+            path: "/a/type.ts",
+            content: `
+export type Foo {
+    bar: number;
+};
+`
+        }
+        const file1 = {
+            path: "/a/file1.ts",
+            content: `
+import { Foo } from "./type";
+const a: Foo = { bar : 1 };
+a.bar;
+`,
+        };
+        const file2 = {
+            path: "/a/file2.ts",
+            content: `
+import { Foo } from "./type";
+const a: Foo = { bar : 2 };
+a.bar;
+`,
+        };
+
+        const config1 = {
+            path: "/a/tsconfig.json",
+            content: jsonToReadableText({
+                extends: "../tsconfig.json",
+                compilerOptions: {
+                    importHelpers: true,
+                },
+            }),
+        }
+
+        const file3 = {
+            path: "/file3.js",
+            content: "console.log('noop');",
+        };
+        const config2 = {
+            path: "/tsconfig.json",
+            content: jsonToReadableText({
+                include: ["**/*"],
+            }),
+        };
+
+        const host = createServerHost([config2, config1, type1, file1, file2, file3]);
+        const session = new TestSession(host);
+
+        openFilesForSession([file3, file1], session);
+
+        session.executeCommandSeq<ts.server.protocol.ReferencesRequest>({
+            command: ts.server.protocol.CommandTypes.References,
+            arguments: {
+                file: file1.path,
+                line: 4,
+                offset: 3
+            },
+        });
+
+        baselineTsserverLogs("importHelpers", "import helpers successfully", session);
+    });
+});