feat: support ng-add schematic

Author: timdeschryver

projects/testing-library/package.json

@@ -21,6 +21,10 @@
     "url": "https://github.com/testing-library/angular-testing-library/issues"
   },
   "homepage": "https://github.com/testing-library/angular-testing-library#readme",
+  "schematics": "./schematics/collection.json",
+  "ng-add": {
+    "save": "devDependencies"
+  },
   "ng-update": {
     "migrations": "./schematics/migrations/migration.json"
   },

projects/testing-library/schematics/collection.json

@@ -0,0 +1,10 @@
+{
+  "schematics": {
+    "ng-add": {
+      "aliases": ["init"],
+      "factory": "./ng-add",
+      "schema": "./ng-add/schema.json",
+      "description": "Add @testing-library/angular to your application"
+    }
+  }
+}

projects/testing-library/schematics/ng-add/index.ts

@@ -0,0 +1,10 @@
+import { Rule, SchematicContext, Tree } from '@angular-devkit/schematics';
+
+export default function (): Rule {
+  return (_host: Tree, context: SchematicContext) => {
+    context.logger.info(
+      `Correctly installed @testing-library/angular.
+See our docs at https://testing-library.com/docs/angular-testing-library/intro/ to get started.`,
+    );
+  };
+}

projects/testing-library/schematics/ng-add/schema.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "http://json-schema.org/schema",
+  "$id": "SchematicsTestingLibraryAngular",
+  "title": "testing-library-anguular",
+  "type": "object",
+  "properties": {},
+  "required": []
+}

projects/testing-library/schematics/ng-add/schema.ts

@@ -0,0 +1,2 @@
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface Schema {}