refactor(testing): add jest in context of primefaces#15009

NOTE:
1. Configured jest according to https://thymikee.github.io/jest-preset-angular/docs/getting-started/installation
2. In was recommended in diverse sources to comment out the files
in `tsconfig.spec.json` to avoid conflicts with jest

.vscode/settings.json

@@ -15,5 +15,6 @@
     "[typescript]": {
         "editor.defaultFormatter": "esbenp.prettier-vscode",
         "editor.formatOnSave": true
-    }
+    },
+    "angular.enable-strict-mode-prompt": false
 }

basic-test.spec.ts

@@ -0,0 +1,35 @@
+/**
+ * This is a basic test file is to test
+ * if your current test tooling works in general.
+ */
+import { Component } from '@angular/core';
+import { TestBed } from '@angular/core/testing';
+
+interface MyInterface {
+    name: string;
+}
+
+@Component({
+    template: ``
+})
+class DummyComponent {}
+
+function p1(): MyInterface {
+    return { name: 'p1' };
+}
+
+describe('test', () => {
+    it('p1', () => {
+        expect(p1().name).toBe('p1');
+    });
+
+    it('should create dummy component', () => {
+        TestBed.configureTestingModule({
+            declarations: [DummyComponent]
+        }).compileComponents();
+
+        const fixture = TestBed.createComponent(DummyComponent);
+        const component = fixture.componentInstance;
+        expect(component).toBeTruthy();
+    });
+});

jest.config.ts

@@ -0,0 +1,13 @@
+import type { Config } from 'jest';
+
+const config: Config = {
+    collectCoverage: true,
+    coverageReporters: ['html'],
+    preset: 'jest-preset-angular',
+    moduleNameMapper: {
+        '^primeng/(.*)': '<rootDir>/packages/primeng/src/$1/public_api'
+    },
+    setupFilesAfterEnv: ['<rootDir>/setup-jest.ts']
+};
+
+export default config;

package.json

@@ -32,7 +32,9 @@
         "format:check": "prettier --check \"**/*.{js,mjs,ts,mts,d.ts,html}\"",
         "lint": "eslint --ext \".js,.mjs,.ts,.mts\" --ignore-path .gitignore . --cache",
         "lint:fix": "eslint --fix --ext \".js,.mjs,.ts,.mts\" --ignore-path .gitignore .",
-        "test:unit": "pnpm --filter primeng test:unit"
+        "test:unit": "pnpm --filter primeng test:unit",
+        "test:jest": "jest",
+        "test:confirm-jest": "jest basic-test.spec.ts"
     },
     "devDependencies": {
         "@angular-devkit/build-angular": "catalog:angular19",
@@ -61,10 +63,13 @@
         "fs-extra": "^11.2.0",
         "glob": "^10.4.2",
         "husky": "^9.1.6",
+        "jest": "^29.7.0",
+        "jest-preset-angular": "^14.3.1",
         "lint-staged": "^12.0.0",
         "ng-packagr": "catalog:angular19",
         "pnpm": "^9.6.0",
         "prettier": "^3.0.0",
+        "ts-jest": "^29.2.5",
         "tsup": "^8.1.0",
         "typescript": "catalog:angular19"
     },
@@ -73,6 +78,8 @@
     },
     "packageManager": "[email protected]",
     "lint-staged": {
-        "**/*.{js,mjs,ts,mts,d.ts,html}": ["prettier --write"]
+        "**/*.{js,mjs,ts,mts,d.ts,html}": [
+            "prettier --write"
+        ]
     }
 }

packages/primeng/src/table/table.service.spec.ts

@@ -0,0 +1,34 @@
+import { TestBed } from '@angular/core/testing';
+
+import { FiltersArg } from '../api/fitlersarg';
+import { TableService } from './table.service';
+
+describe('TableService', () => {
+    describe('filter entries', () => {
+        describe('by single field aka locally', () => {
+            let service: TableService;
+
+            beforeEach(() => {
+                // DEBUG! Prove this in the official docs
+                TestBed.configureTestingModule({
+                    providers: [TableService]
+                });
+                service = TestBed.inject(TableService);
+            });
+
+            it('should filter by starts with', () => {
+                const data = [{ name: 'foo' }, { name: 'bar' }];
+                const filters: FiltersArg = {
+                    name: {
+                        value: 'f',
+                        matchMode: 'startsWith'
+                    }
+                };
+
+                const result = service.filter(data, filters, [], 'startsWith');
+                expect(result).toEqual([{ name: 'foo' }]);
+            });
+        });
+        describe('by all fields aka globally', () => {});
+    });
+});