test: date synonym handling

Author: fionaRowan

packages/decap-cms-core/src/lib/__tests__/formatters.spec.js

@@ -326,6 +326,20 @@ describe('formatters', () => {
       ).toBe('2026-10-20-post-title');
     });
 
+    it('should see date filters applied to publishDate from entry if it exists', () => {
+      const { selectInferredField } = require('../../reducers/collections');
+      selectInferredField.mockReturnValue('publishDate');
+      const entryDate = new Date('2026-10-20');
+
+      expect(
+        slugFormatter(
+          Map({ slug: '{{year}}-{{month}}-{{day}}-{{title}}' }),
+          Map({ publishDate: entryDate, title: 'post title' }),
+          slugConfig,
+        ),
+      ).toBe('2026-10-20-post-title');
+    });
+
     it('should return slug', () => {
       selectIdentifier.mockReturnValueOnce('title');
 

packages/decap-cms-core/src/reducers/__tests__/collections.spec.js

@@ -11,6 +11,7 @@ import collections, {
   getFieldsNames,
   selectField,
   updateFieldByKey,
+  selectInferredField,
 } from '../collections';
 import { FILES, FOLDER } from '../../constants/collectionTypes';
 
@@ -568,4 +569,42 @@ describe('collections', () => {
       );
     });
   });
+
+  describe("selectInferredField(collection, 'date')", () => {
+    it('should return publishDate if set', () => {
+      const collection = fromJS({
+        fields: [{ name: 'title' }, { name: 'publishDate', widget: 'datetime' }],
+      });
+
+      expect(selectInferredField(collection, 'date')).toEqual('publishDate');
+    });
+
+    it('should return publish_date if set', () => {
+      const collection = fromJS({
+        fields: [{ name: 'title' }, { name: 'publish_date', widget: 'datetime' }],
+      });
+
+      expect(selectInferredField(collection, 'date')).toEqual('publish_date');
+    });
+
+    it('should return date if set', () => {
+      const collection = fromJS({
+        fields: [{ name: 'title' }, { name: 'date', widget: 'datetime' }],
+      });
+
+      expect(selectInferredField(collection, 'date')).toEqual('date');
+    });
+
+    it('should return first date field if multiple synonyms are present', () => {
+      const collection = fromJS({
+        fields: [
+          { name: 'title' },
+          { name: 'publishDate', widget: 'datetime' },
+          { name: 'date', widget: 'datetime' },
+        ],
+      });
+
+      expect(selectInferredField(collection, 'date')).toEqual('publishDate');
+    });
+  });
 });