Use AssetGraph#info to emit the notification

#95 (comment)

lib/subfont.js

@@ -140,7 +140,9 @@ module.exports = async function subfont(
     .findRelations({ type: 'HttpRedirect' })
     .sort((a, b) => a.id - b.id)) {
     if (relation.from.isInitial) {
-      console.warn(`${relation.from.url} redirected to ${relation.to.url}`);
+      assetGraph.info(
+        new Error(`${relation.from.url} redirected to ${relation.to.url}`)
+      );
       relation.to.isInitial = true;
       relation.from.isInitial = false;
     }

test/subfont.js

@@ -3,6 +3,7 @@ const sinon = require('sinon');
 const expect = require('unexpected').clone().use(require('unexpected-sinon'));
 const subfont = require('../lib/subfont');
 const httpception = require('httpception');
+const AssetGraph = require('assetgraph');
 const proxyquire = require('proxyquire');
 const pathModule = require('path');
 const openSansBold = require('fs').readFileSync(
@@ -20,6 +21,10 @@ describe('subfont', function () {
     mockConsole = { log: sinon.spy(), warn: sinon.spy(), error: sinon.spy() };
   });
 
+  afterEach(function () {
+    sinon.restore();
+  });
+
   describe('when a font is referenced by a stylesheet hosted outside the root', function () {
     it('should move the CSS into the root', async function () {
       httpception([
@@ -265,6 +270,8 @@ describe('subfont', function () {
       ]);
 
       const root = 'http://example.com/';
+      sinon.stub(AssetGraph.prototype, 'info');
+
       const assetGraph = await subfont(
         {
           root,
@@ -286,9 +293,11 @@ describe('subfont', function () {
         'to equal',
         'https://somewhereelse.com/index.html'
       );
-      expect(mockConsole.warn, 'to have a call satisfying', () => {
-        mockConsole.warn(
-          'http://example.com/ redirected to https://somewhereelse.com/'
+      expect(assetGraph.info, 'to have a call satisfying', () => {
+        assetGraph.info(
+          new Error(
+            'http://example.com/ redirected to https://somewhereelse.com/'
+          )
         );
       });
     });