add dispute functionality for contract duty and implement collection dates

apps/edr-freight-api/src/modules/contracts/contract-field-diff.spec.ts

@@ -0,0 +1,89 @@
+import {
+  diffContractFields,
+  summarizeChanges,
+} from './contract-document-diff.util';
+
+/**
+ * The contract-field audit runs on the customer's own edits, so it has to be
+ * exact: never report a field the edit did not touch, and never render a value
+ * as "[object Object]" or "true" in the trail a reviewer reads.
+ */
+describe('diffContractFields', () => {
+  it('reports only the fields that actually changed', () => {
+    const changes = diffContractFields(
+      { freightType: 'BULK', paymentCurrency: 'USD', isReefer: false },
+      { freightType: 'CONTAINER', paymentCurrency: 'USD', isReefer: false },
+    );
+
+    expect(changes).toEqual([
+      {
+        kind: 'FIELD_CHANGED',
+        field: 'freightType',
+        label: 'Freight type',
+        from: 'BULK',
+        to: 'CONTAINER',
+      },
+    ]);
+  });
+
+  it('renders booleans as Yes/No, not true/false', () => {
+    const [change] = diffContractFields({ isHazardous: false }, { isHazardous: true });
+
+    expect(change).toMatchObject({ label: 'Hazardous', from: 'No', to: 'Yes' });
+  });
+
+  it('treats null, undefined and empty string as "not set"', () => {
+    expect(diffContractFields({ unNumber: null }, { unNumber: '' })).toEqual([]);
+    expect(diffContractFields({ unNumber: undefined }, { unNumber: null })).toEqual([]);
+
+    const [set] = diffContractFields({ unNumber: null }, { unNumber: 'UN1234' });
+    expect(set).toMatchObject({ from: null, to: 'UN1234' });
+  });
+
+  it('ignores fields absent from the update', () => {
+    // A partial edit must not report the fields it never sent.
+    expect(diffContractFields({ freightType: 'BULK', isReefer: true }, {})).toEqual([]);
+  });
+
+  it('records a route swap that keeps the same lane count', () => {
+    const [change] = diffContractFields(
+      { routes: 'Nagad → Mojo' },
+      { routes: 'Nagad → Adama' },
+    );
+
+    expect(change).toMatchObject({
+      label: 'Routes',
+      from: 'Nagad → Mojo',
+      to: 'Nagad → Adama',
+    });
+  });
+
+  it('summarises field changes by name, and by count once there are many', () => {
+    const few = diffContractFields(
+      { freightType: 'BULK', paymentCurrency: 'USD' },
+      { freightType: 'CONTAINER', paymentCurrency: 'ETB' },
+    );
+    expect(summarizeChanges(few)).toBe('freight type, payment currency changed');
+
+    const many = diffContractFields(
+      { a: '1', b: '1', c: '1', d: '1' },
+      { a: '2', b: '2', c: '2', d: '2' },
+    );
+    expect(summarizeChanges(many)).toBe('4 contract fields changed');
+  });
+
+  it('summarises document and field changes together', () => {
+    const summary = summarizeChanges([
+      { kind: 'ARTICLE_BODY_CHANGED', articleId: 'a-1', title: 'Article 1' },
+      {
+        kind: 'FIELD_CHANGED',
+        field: 'routes',
+        label: 'Routes',
+        from: 'A → B',
+        to: 'A → C',
+      },
+    ]);
+
+    expect(summary).toBe('1 article edited, routes changed');
+  });
+});