Add transforms to and from core Image block

tests/jest/transforms.test.js

@@ -0,0 +1,66 @@
+import { transforms } from '../../src/transforms';
+
+describe( 'transforms', () => {
+    test( 'exposes a "to" transform targeting core/image', () => {
+        const to = transforms.to;
+        expect( Array.isArray( to ) ? to : [ to ] ).toEqual(
+            expect.arrayContaining( [
+                expect.objectContaining( {
+                    type: 'block',
+                    blocks: expect.arrayContaining( [ 'core/image' ] ),
+                } ),
+            ] )
+        );
+    } );
+
+    test( 'exposes a "from" transform sourced from core/image', () => {
+        const from = transforms.from;
+        expect( Array.isArray( from ) ? from : [ from ] ).toEqual(
+            expect.arrayContaining( [
+                expect.objectContaining( {
+                    type: 'block',
+                    blocks: expect.arrayContaining( [ 'core/image' ] ),
+                } ),
+            ] )
+        );
+    } );
+
+    test( 'to-transform drops filter and intensity', () => {
+        const to = Array.isArray( transforms.to ) ? transforms.to[ 0 ] : transforms.to;
+        const mapped = to.transform( {
+            filter: 'dramatic',
+            intensity: 80,
+            imageId: 12,
+            imageUrl: 'https://example.com/a.jpg',
+            imageAlt: 'A',
+            width: 100,
+            height: 100,
+            linkUrl: '',
+            caption: '',
+        } );
+        expect( mapped ).not.toHaveProperty( 'filter' );
+        expect( mapped ).not.toHaveProperty( 'intensity' );
+        expect( mapped.id ).toBe( 12 );
+        expect( mapped.url ).toBe( 'https://example.com/a.jpg' );
+    } );
+
+    test( 'from-transform normalises filter and intensity to defaults', () => {
+        const from = Array.isArray( transforms.from ) ? transforms.from[ 0 ] : transforms.from;
+        const mapped = from.transform( {
+            id: 12,
+            url: 'https://example.com/a.jpg',
+            alt: 'A',
+            caption: 'cap',
+            width: 100,
+            height: 100,
+            href: 'https://example.com',
+        } );
+        expect( mapped.filter ).toBe( 'normal' );
+        expect( mapped.intensity ).toBe( 100 );
+        expect( mapped.imageId ).toBe( 12 );
+        expect( mapped.imageUrl ).toBe( 'https://example.com/a.jpg' );
+        expect( mapped.imageAlt ).toBe( 'A' );
+        expect( mapped.caption ).toBe( 'cap' );
+        expect( mapped.linkUrl ).toBe( 'https://example.com' );
+    } );
+} );