feat: implement tests and coverage reports for KpiCards and scrapeLakes functionality

src/__tests__/translations.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect } from 'vitest';
+import { t } from '../translations';
+
+describe('Translations', () => {
+  it('should have exactly the same keys in English and Czech', () => {
+    const enKeys = Object.keys(t.en).sort();
+    const csKeys = Object.keys(t.cs).sort();
+    
+    expect(enKeys).toEqual(csKeys);
+    
+    // Deep check for nested keys
+    for (const key of enKeys) {
+      const enSubKeys = Object.keys((t.en as any)[key]).sort();
+      const csSubKeys = Object.keys((t.cs as any)[key]).sort();
+      
+      expect(enSubKeys).toEqual(csSubKeys);
+    }
+  });
+
+  it('should not have empty translation strings', () => {
+    const checkEmpty = (obj: any) => {
+      for (const val of Object.values(obj)) {
+        if (typeof val === 'string') {
+          expect(val.length).toBeGreaterThan(0);
+        } else if (typeof val === 'object') {
+          checkEmpty(val);
+        }
+      }
+    };
+    
+    checkEmpty(t.en);
+    checkEmpty(t.cs);
+  });
+});