also add test case

Author: bobzhang

jscomp/build_tests/namespace/input.js

@@ -5,7 +5,7 @@ var fs = require('fs')
 var path = require('path')
 child_process.execSync(`bsb -clean-world && bsb -make-world`, {cwd:__dirname, stdio:[0,1,2]})
 
-var x = require('./src/demo.js')
+var x = require('./src/demo.bs.js')
 var assert = require('assert')
 
 assert.equal(x.v, 3 )

jscomp/build_tests/namespace/src/demo.js renamed to jscomp/build_tests/namespace/src/demo.bs.js

@@ -1,6 +1,6 @@
 'use strict';
 
-var Demo$Liba = require("liba/src/demo.js");
+var Demo$Liba = require("liba/src/demo.bs.js");
 var Demo$Libb = require("libb/src/demo.js");
 
 var v = Demo$Liba.v + Demo$Libb.v | 0;

jscomp/build_tests/namespace/src/main.js renamed to jscomp/build_tests/namespace/src/main.bs.js

@@ -1,6 +1,6 @@
 'use strict';
 
-var Demo$Namespace = require("./demo.js");
+var Demo$Namespace = require("./demo.bs.js");
 
 var a = Demo$Namespace.v;