diff --git a/tests/acceptance/nested-addons-smoke-test-slow.js b/tests/acceptance/nested-addons-smoke-test-slow.js
index 76915cc7c95..30e5e613aed 100644
--- a/tests/acceptance/nested-addons-smoke-test-slow.js
+++ b/tests/acceptance/nested-addons-smoke-test-slow.js
@@ -52,6 +52,20 @@ describe('Acceptance: nested-addons-smoke-test', function() {
       .then(function() {
         expect(file('dist/assets/vendor.js')).to.contain('INNER_ADDON_IMPORT_WITH_APP_IMPORT');
         expect(file('dist/assets/vendor.js')).to.contain('INNER_ADDON_IMPORT_WITH_THIS_IMPORT');
+
+        // RAW comments should have been converted to PREPROCESSED by
+        // tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon
+        // then from PREPROCESSED to POSTPROCESSED by
+        // tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon
+        expect(file('dist/assets/vendor.js')).to.contain('POSTPROCESSED node_modules/ember-top-addon/addon/templates/application.hbs');
+        expect(file('dist/assets/vendor.js')).to.contain('POSTPROCESSED node_modules/ember-top-addon/addon/index.js');
+        expect(file('dist/assets/vendor.css')).to.contain('POSTPROCESSED node_modules/ember-top-addon/addon/styles/app.css');
+
+        // the pre/post process tree hooks above should *not* have changed RAW's in the current app
+        expect(file('dist/assets/some-cool-app.js')).to.contain('RAW app/foo.js');
+
+        // should *not* have changed RAW's in sibling addons
+        expect(file('dist/assets/vendor.js')).to.contain('RAW node_modules/ember-top-addon/node_modules/ember-inner-addon/addon/index.js');
       });
   });
 });
diff --git a/tests/fixtures/addon/with-nested-addons/app/foo.js b/tests/fixtures/addon/with-nested-addons/app/foo.js
new file mode 100644
index 00000000000..55a91a31905
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/app/foo.js
@@ -0,0 +1 @@
+// RAW app/foo.js
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/index.js b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/index.js
new file mode 100644
index 00000000000..d4f9738ea8d
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/index.js
@@ -0,0 +1 @@
+// RAW node_modules/ember-top-addon/addon/index.js
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/styles/app.css b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/styles/app.css
new file mode 100644
index 00000000000..2dc79871001
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/styles/app.css
@@ -0,0 +1 @@
+/* RAW node_modules/ember-top-addon/addon/styles/app.css */
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/templates/application.hbs b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/templates/application.hbs
new file mode 100644
index 00000000000..e926291cd48
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/addon/templates/application.hbs
@@ -0,0 +1 @@
+<!-- RAW node_modules/ember-top-addon/addon/templates/application.hbs -->
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/ember-inner-addon/addon/index.js b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/ember-inner-addon/addon/index.js
new file mode 100644
index 00000000000..b5874b2dc9a
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/ember-inner-addon/addon/index.js
@@ -0,0 +1 @@
+// RAW node_modules/ember-top-addon/node_modules/ember-inner-addon/addon/index.js
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/index.js b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/index.js
new file mode 100644
index 00000000000..620af00b381
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/index.js
@@ -0,0 +1,11 @@
+'use strict';
+
+const stew = require('broccoli-stew');
+
+module.exports = {
+  name: 'postprocesstree-addon',
+
+  postprocessTree(type, tree) {
+    return stew.map(tree, contents => contents.replace('PREPROCESSED', 'POSTPROCESSED'));
+  },
+};
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/package.json b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/package.json
new file mode 100644
index 00000000000..2beaf2647b9
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/postprocesstree-addon/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "postprocesstree-addon",
+  "version": "0.0.0",
+  "private": true,
+  "keywords": [
+    "ember-addon"
+  ],
+  "dependencies": {
+  }
+}
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/index.js b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/index.js
new file mode 100644
index 00000000000..d0ead1cef1d
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/index.js
@@ -0,0 +1,11 @@
+'use strict';
+
+const stew = require('broccoli-stew');
+
+module.exports = {
+  name: 'preprocesstree-addon',
+
+  preprocessTree(type, tree) {
+    return stew.map(tree, contents => contents.replace('RAW', 'PREPROCESSED'));
+  },
+};
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/package.json b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/package.json
new file mode 100644
index 00000000000..51bf0fe02fc
--- /dev/null
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/node_modules/preprocesstree-addon/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "preprocesstree-addon",
+  "version": "0.0.0",
+  "private": true,
+  "keywords": [
+    "ember-addon"
+  ],
+  "dependencies": {
+  }
+}
diff --git a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/package.json b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/package.json
index 8b82da4d62c..a2a8e09f833 100644
--- a/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/package.json
+++ b/tests/fixtures/addon/with-nested-addons/node_modules/ember-top-addon/package.json
@@ -7,6 +7,9 @@
   ],
   "dependencies": {
     "ember-inner-addon": "latest",
-    "ember-inner-addon2": "latest"
+    "ember-inner-addon2": "latest",
+    "ember-cli-htmlbars": "*",
+    "preprocesstree-addon": "*",
+    "postprocesstree-addon": "*"
   }
 }