diff --git a/server/src/services/typescriptService/test/serviceHost.test.ts b/server/src/services/typescriptService/test/serviceHost.test.ts
new file mode 100644
index 0000000000..25e4e35181
--- /dev/null
+++ b/server/src/services/typescriptService/test/serviceHost.test.ts
@@ -0,0 +1,69 @@
+import assert from 'assert';
+import path from 'path';
+import ts from 'typescript';
+import { TextDocument } from 'vscode-languageserver-textdocument';
+import { URI } from 'vscode-uri';
+import { getDefaultVLSConfig } from '../../../config';
+import { getVueDocumentRegions } from '../../../embeddedSupport/embeddedSupport';
+import { LanguageModelCache } from '../../../embeddedSupport/languageModelCache';
+import { createEnvironmentService } from '../../EnvironmentService';
+import { getServiceHost } from '../serviceHost';
+
+suite('serviceHost', () => {
+  suite('interpolation performance', () => {
+    const repoRootPath = path.resolve(__dirname, '../../../../..');
+    const fixturePath = path.resolve(__dirname, repoRootPath, './test/interpolation/fixture');
+
+    function setup() {
+      const scriptRegionDocuments: LanguageModelCache<TextDocument> = {
+        refreshAndGet(doc) {
+          return getVueDocumentRegions(doc).getSingleTypeDocument('script');
+        },
+        onDocumentRemoved() {},
+        dispose() {}
+      };
+      const serviceHost = getServiceHost(
+        ts,
+        createEnvironmentService(
+          fixturePath,
+          fixturePath,
+          fixturePath,
+          path.join(fixturePath, 'package.json'),
+          fixturePath,
+          [],
+          getDefaultVLSConfig()
+        ),
+        scriptRegionDocuments
+      );
+
+      const filePath = path.join(fixturePath, 'DoNotMatter.vue');
+      const doc = TextDocument.create(URI.file(filePath).toString(), 'vue', 0, '');
+
+      return { serviceHost, doc };
+    }
+    test('reuse type checker', () => {
+      const { serviceHost, doc } = setup();
+
+      const firstTypeChecker = serviceHost.updateCurrentVueTextDocument(doc).service.getProgram()?.getTypeChecker();
+
+      const secondTypeChecker = serviceHost.updateCurrentVueTextDocument(doc).service.getProgram()?.getTypeChecker();
+
+      assert.strictEqual(firstTypeChecker, secondTypeChecker);
+    }).timeout(4000);
+    test('reuse type checker', () => {
+      const { serviceHost, doc } = setup();
+
+      const firstTypeChecker = serviceHost
+        .updateCurrentVirtualVueTextDocument(doc)
+        .templateService.getProgram()
+        ?.getTypeChecker();
+
+      const secondTypeChecker = serviceHost
+        .updateCurrentVirtualVueTextDocument(doc)
+        .templateService.getProgram()
+        ?.getTypeChecker();
+
+      assert.strictEqual(firstTypeChecker, secondTypeChecker);
+    }).timeout(4000);
+  });
+});