fix: precompile puts addon-test-support declarations in the correct place

Author: mike-north

index.js

@@ -69,8 +69,9 @@ module.exports = {
   },
 
   treeForTestSupport() {
-    let trees = [this.compiler.treeForTests()];
+    let trees = [];
     if (this.compiler) {
+      trees.push(this.compiler.treeForTests());
       let babel = this.project.addons.find(addon => addon.name === 'ember-cli-babel');
       let tree = this.compiler.treeForTestSupport();
       trees.push(babel.transpileTree(tree));

lib/commands/precompile.js

@@ -47,7 +47,9 @@ module.exports = Command.extend({
 
           // We can only do anything meaningful with declarations for files in addon/ or src/
           if (this._isAddonFile(declSource)) {
-            let declDest = declSource.replace(/^addon\//, '');
+            let declDest = declSource
+              .replace(/^addon\//, '')
+              .replace(/^addon-test-support/, 'test-support');
             this._copyFile(output, `${outDir}/${declSource}`, declDest);
           } else if (this._isSrcFile(declSource)) {
             this._copyFile(output, `${outDir}/${declSource}`, declSource);