Fix compile error

Author: sluukkonen

packages/generator/__tests__/testGenerateExam.ts

@@ -280,7 +280,7 @@ describe('generateExam()', () => {
       examCode: optional(fc.constantFrom('EA', 'M', 'N')),
       dayCode: optional(fc.constant('X')),
       maxAnswers: optional(maxAnswers),
-      languages: optional(fc.set(fc.constantFrom('fi-FI', 'sv-FI'), 1, 2)),
+      languages: optional(fc.set(fc.constantFrom('fi-FI' as const, 'sv-FI' as const), 1, 2)),
       title: optional(fc.string()),
       sections,
     })