it("should build", async function() {
    input.write({
      "src": {
        "ui": {
          "components": {
            "todo-item": {
              "style.scss": '/* todo item styles */'
            },
            "other-thing": {
              "style.scss": '/* other thing styles */'
            }
          }
        }
      }
    });

    await output.build();

    expect(output.read()).to.deep.equal({
      "src": {
        "ui": {
          "styles": {
            "app.scss": stripIndent`
              @import "src/ui/components/todo-item/style";
              @import "src/ui/components/other-thing/style";`
          },
          "components": {
            "todo-item": {
              "style.scss": '/* todo item styles */'
            },
            "other-thing": {
              "style.scss": '/* other thing styles */'
            }
          }
        }
      }
    });
});

{
  // snip ....
  "keywords": [
    // existing keywords?
    "ember-addon"
  ],
  "ember-addon": {
    "main": "ember-addon-index.js"
  }
}

const MergeTrees = require('broccoli-merge-trees');
const StyleManifest = require('broccoli-style-manifest');

module.exports = {
  name: 'broccoli-style-manifest',

  preprocessTree(type, tree) {
    if (type === 'src') {
      return new MergeTrees([tree, new StyleManifest(tree, {
        outputFileNameWithoutExtension: 'src/ui/styles/app'
      })], { overwrite: true });
    }
  }
};