diff --git a/sol/tests.sol b/sol/tests.sol.js
similarity index 99%
rename from sol/tests.sol
rename to sol/tests.sol.js
index 4fafe85392..2356f09100 100644
--- a/sol/tests.sol
+++ b/sol/tests.sol.js
@@ -1,3 +1,4 @@
+module.exports = `
 pragma solidity ^0.4.7;
 
 library Assert {
@@ -99,4 +100,4 @@ library Assert {
   //}
 
 }
-
+`;
diff --git a/src/index.js b/src/index.js
index e484b1ba01..8ae7143d06 100644
--- a/src/index.js
+++ b/src/index.js
@@ -188,5 +188,6 @@ var runTestFiles = function (filepath, isDirectory, web3) {
 module.exports = {
   runTestFiles: runTestFiles,
   runTestSources: runTestSources,
-  runTest: TestRunner.runTest
+  runTest: TestRunner.runTest,
+  assertLibCode: require('../sol/tests.sol.js')
 }