add auto-highlighting of selected/updated code

tests/unit/domain/Category.spec.ts

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+import 'mocha';
+import { expect } from 'chai';
+import { Category } from '@/domain/Category';
+import { CategoryStub } from '../stubs/CategoryStub';
+import { ScriptStub } from '../stubs/ScriptStub';
+
+describe('Category', () => {
+    describe('ctor', () => {
+        it('throws when name is empty', () => {
+            const expectedError = 'undefined or empty name';
+            const construct = () => new Category(5, '', [], [new CategoryStub(5)], []);
+            expect(construct).to.throw(expectedError);
+        });
+        it('throws when has no children', () => {
+            const expectedError = 'A category must have at least one sub-category or script';
+            const construct = () => new Category(5, 'category', [], [], []);
+            expect(construct).to.throw(expectedError);
+        });
+    });
+    describe('getAllScriptsRecursively', () => {
+        it('gets child scripts', () => {
+            // arrange
+            const expected = [ new ScriptStub('1'), new ScriptStub('2') ];
+            const sut = new Category(0, 'category', [], [], expected);
+            // act
+            const actual = sut.getAllScriptsRecursively();
+            // assert
+            expect(actual).to.have.deep.members(expected);
+        });
+        it('gets child categories', () => {
+            // arrange
+            const expectedScriptIds = ['1', '2', '3', '4'];
+            const categories = [
+                new CategoryStub(31).withScriptIds('1', '2'),
+                new CategoryStub(32).withScriptIds('3', '4'),
+            ];
+            const sut = new Category(0, 'category', [], categories, []);
+            // act
+            const actualIds = sut.getAllScriptsRecursively().map((s) => s.id);
+            // assert
+            expect(actualIds).to.have.deep.members(expectedScriptIds);
+
+        });
+        it('gets child scripts and categories', () => {
+            // arrange
+            const expectedScriptIds = ['1', '2', '3', '4', '5' , '6'];
+            const categories = [
+                new CategoryStub(31).withScriptIds('1', '2'),
+                new CategoryStub(32).withScriptIds('3', '4'),
+            ];
+            const scripts = [ new ScriptStub('5'), new ScriptStub('6') ];
+            const sut = new Category(0, 'category', [], categories, scripts);
+            // act
+            const actualIds = sut.getAllScriptsRecursively().map((s) => s.id);
+            // assert
+            expect(actualIds).to.have.deep.members(expectedScriptIds);
+
+        });
+        it('gets child categories recursively', () => {
+            // arrange
+            const expectedScriptIds = ['1', '2', '3', '4', '5', '6'];
+            const categories = [
+                new CategoryStub(31)
+                    .withScriptIds('1', '2')
+                    .withCategory(
+                        new CategoryStub(32)
+                            .withScriptIds('3', '4'),
+                    ),
+                new CategoryStub(33)
+                    .withCategories(
+                        new CategoryStub(34)
+                            .withScriptIds('5')
+                            .withCategory(
+                                new CategoryStub(35)
+                                    .withCategory(
+                                        new CategoryStub(35).withScriptIds('6'),
+                                    ),
+                            ),
+                    ),
+            ];
+            // assert
+            const sut = new Category(0, 'category', [], categories, []);
+            // act
+            const actualIds = sut.getAllScriptsRecursively().map((s) => s.id);
+            // assert
+            expect(actualIds).to.have.deep.members(expectedScriptIds);
+        });
+    });
+});