diff --git a/src/public/app/services/eslint.spec.ts b/src/public/app/services/eslint.spec.ts
index 1dc271d89..c6b87162a 100644
--- a/src/public/app/services/eslint.spec.ts
+++ b/src/public/app/services/eslint.spec.ts
@@ -7,7 +7,7 @@ describe("Linter", () => {
         const result = await lint(trimIndentation`
             for (const i = 0; i<10; i++) {
             }
-        `);
+        `, "application/javascript;env=frontend");
         expect(result).toMatchObject([
             { message: "'i' is constant.", },
             { message: "Empty block statement." }
@@ -23,7 +23,7 @@ describe("Linter", () => {
             }
 
             api.showMessage("Hi");
-        `);
+        `, "application/javascript;env=frontend");
         expect(result.length).toBe(0);
     });
 
@@ -33,7 +33,7 @@ describe("Linter", () => {
             function world() { }
 
             console.log("Hello world");
-        `);
+        `, "application/javascript;env=frontend");
         expect(result).toMatchObject([
             {
                 message: "'hello' is defined but never used.",