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frontend/src/lib/api.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, it } from 'vitest';
 
 import type { FeatureMeta } from '../types';
 import { apiUrl, assertOk, buildFilterString, isAbortError } from './api';
+import { createSchoolFilterKey } from './school-filter';
 
 describe('api utilities', () => {
   it('builds API URLs from endpoint names, paths, and params', () => {
@@ -64,4 +65,20 @@ describe('api utilities', () => {
       )
     ).toBe('Property type:Flat');
   });
+
+  it('deduplicates repeated synthetic school filters before backend routes', () => {
+    const features: FeatureMeta[] = [
+      { name: 'Good+ primary schools within 2km', type: 'numeric', min: 0, max: 10 },
+    ];
+
+    expect(
+      buildFilterString(
+        {
+          [createSchoolFilterKey('primary', 'good', 2, 1)]: [1, 10],
+          [createSchoolFilterKey('primary', 'good', 2, 2)]: [2, 8],
+        },
+        features
+      )
+    ).toBe('Good+ primary schools within 2km:2:8');
+  });
 });