Function ruleYes

packages/angular_devkit/schematics/src/rules/base_spec.ts:196–201

(tree: Tree)

    const predicate = (path: Path) => path.indexOf('1') != -1;

    const ruleYes: Rule = (tree: Tree) => {
      expect(tree.exists('/test1')).toBe(true);
      expect(tree.exists('/test2')).toBe(false);

      return empty();
    };
    const ruleNo: Rule = (tree: Tree) => {
      expect(tree.exists('/test1')).toBe(false);
      expect(tree.exists('/test2')).toBe(true);