feat: 🎸 add .clone() function to ChartMetadata (#112)

* feat: 🎸 add .clone() function to ChartMetadata

* test: 💍 add unit tests

* fix: 🐛 lint

superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-chart/src/models/ChartMetadata.ts

@@ -4,6 +4,7 @@ interface LookupTable {
 
 export default class ChartMetadata {
   name: string;
+  canBeAnnotationTypes?: string[];
   canBeAnnotationTypesLookup: LookupTable;
   credits: string[];
   description: string;
@@ -37,6 +38,7 @@ export default class ChartMetadata {
     this.credits = credits;
     this.description = description;
     this.show = show;
+    this.canBeAnnotationTypes = canBeAnnotationTypes;
     this.canBeAnnotationTypesLookup = canBeAnnotationTypes.reduce(
       (prev: LookupTable, type: string) => {
         const lookup = prev;
@@ -54,4 +56,17 @@ export default class ChartMetadata {
   canBeAnnotationType(type: string): boolean {
     return this.canBeAnnotationTypesLookup[type] || false;
   }
+
+  clone() {
+    return new ChartMetadata({
+      canBeAnnotationTypes: this.canBeAnnotationTypes,
+      credits: this.credits,
+      description: this.description,
+      name: this.name,
+      show: this.show,
+      supportedAnnotationTypes: this.supportedAnnotationTypes,
+      thumbnail: this.thumbnail,
+      useLegacyApi: this.useLegacyApi,
+    });
+  }
 }

superset-frontend/temporary_superset_ui/superset-ui/packages/superset-ui-chart/test/models/ChartMetadata.test.ts

@@ -18,9 +18,9 @@ describe('ChartMetadata', () => {
   describe('.canBeAnnotationType(type)', () => {
     const metadata = new ChartMetadata({
       name: 'test chart',
+      canBeAnnotationTypes: ['event'],
       credits: [],
       description: 'some kind of chart',
-      canBeAnnotationTypes: ['event'],
       thumbnail: 'test.png',
     });
     it('returns true if can', () => {
@@ -30,4 +30,25 @@ describe('ChartMetadata', () => {
       expect(metadata.canBeAnnotationType('invalid-type')).toBeFalsy();
     });
   });
+  describe('.clone()', () => {
+    const metadata = new ChartMetadata({
+      name: 'test chart',
+      canBeAnnotationTypes: ['event'],
+      credits: [],
+      description: 'some kind of chart',
+      thumbnail: 'test.png',
+    });
+    const clone = metadata.clone();
+
+    it('returns a new instance', () => {
+      expect(metadata).not.toBe(clone);
+    });
+    it('returns a new instance with same field values', () => {
+      expect(metadata.name).toEqual(clone.name);
+      expect(metadata.credits).toEqual(clone.credits);
+      expect(metadata.description).toEqual(clone.description);
+      expect(metadata.canBeAnnotationTypes).toEqual(clone.canBeAnnotationTypes);
+      expect(metadata.thumbnail).toEqual(clone.thumbnail);
+    });
+  });
 });