good

frontend/src/lib/url-state.test.ts

@@ -153,6 +153,27 @@ describe('url-state', () => {
     expect(state.poiCategories).toEqual(new Set());
   });
 
+  it('serializes a selected postcode for saved dashboard URLs', () => {
+    const params = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      'SW1A 1AA'
+    );
+
+    expect(params.get('pc')).toBe('SW1A 1AA');
+
+    window.history.replaceState({}, '', `/?${params.toString()}`);
+    expect(parseUrlState().postcode).toBe('SW1A 1AA');
+  });
+
   it('round-trips overlay selections', () => {
     const params = stateToParams(
       null,
@@ -197,6 +218,139 @@ describe('url-state', () => {
     expect(parseUrlState().basemap).toBe('standard');
   });
 
+  it('round-trips non-default colour opacity', () => {
+    const defaultParams = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      1
+    );
+    expect(defaultParams.has('colorOpacity')).toBe(false);
+
+    const params = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      undefined,
+      0.45
+    );
+
+    expect(params.get('colorOpacity')).toBe('45');
+
+    window.history.replaceState({}, '', `/?${params.toString()}`);
+    expect(parseUrlState().colorOpacity).toBe(0.45);
+
+    window.history.replaceState({}, '', '/?colorOpacity=not-a-number');
+    expect(parseUrlState().colorOpacity).toBe(1);
+
+    window.history.replaceState({}, '', '/?colorOpacity=0');
+    expect(parseUrlState().colorOpacity).toBe(0.1);
+  });
+
+  it('round-trips a crime-type subset when the crime overlay is active', () => {
+    const params = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      new Set(['crime-hotspots']),
+      undefined,
+      new Set(['Burglary', 'Robbery'])
+    );
+
+    expect(params.getAll('crimeType')).toEqual(['Burglary', 'Robbery']);
+
+    window.history.replaceState({}, '', `/?${params.toString()}&crimeType=NotAType`);
+    expect(parseUrlState().crimeTypes).toEqual(new Set(['Burglary', 'Robbery']));
+  });
+
+  it('omits crime types when all are selected or the crime overlay is off', () => {
+    const allSelected = new Set([
+      'Violence and sexual offences',
+      'Anti-social behaviour',
+      'Criminal damage and arson',
+      'Public order',
+      'Shoplifting',
+      'Vehicle crime',
+      'Burglary',
+      'Other theft',
+      'Theft from the person',
+      'Bicycle theft',
+      'Drugs',
+      'Robbery',
+      'Possession of weapons',
+      'Other crime',
+    ]);
+    const allParams = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      new Set(['crime-hotspots']),
+      undefined,
+      allSelected
+    );
+    expect(allParams.getAll('crimeType')).toEqual([]);
+
+    // Subset selected but the crime overlay is not active → nothing emitted.
+    const overlayOffParams = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      new Set(['noise']),
+      undefined,
+      new Set(['Burglary'])
+    );
+    expect(overlayOffParams.getAll('crimeType')).toEqual([]);
+
+    expect(parseUrlState().crimeTypes).toBeUndefined();
+  });
+
+  it('round-trips a fully-deselected crime-type state via sentinel', () => {
+    const params = stateToParams(
+      null,
+      {},
+      [],
+      new Set(),
+      'area',
+      undefined,
+      undefined,
+      new Set(['crime-hotspots']),
+      undefined,
+      new Set()
+    );
+
+    expect(params.getAll('crimeType')).toEqual(['__none']);
+
+    window.history.replaceState({}, '', `/?${params.toString()}`);
+    expect(parseUrlState().crimeTypes).toEqual(new Set());
+  });
+
   it('round-trips repeated school filters with dedicated URL params', () => {
     const schoolOne = createSchoolFilterKey('primary', 'good', 2, 1);
     const schoolTwo = createSchoolFilterKey('secondary', 'outstanding', 5, 2);