diff --git a/remix-tests/src/compiler.ts b/remix-tests/src/compiler.ts
index 7ec33d4a6f..3b247ff5c4 100644
--- a/remix-tests/src/compiler.ts
+++ b/remix-tests/src/compiler.ts
@@ -2,7 +2,7 @@ import fs from './fileSystem'
 import async from 'async'
 import path from 'path'
 let RemixCompiler = require('remix-solidity').Compiler
-import { SrcIfc } from './types'
+import { SrcIfc, CompilerConfiguration } from './types'
 
 function regexIndexOf (inputString: string, regex: RegExp, startpos: number = 0) {
     const indexOf = inputString.substring(startpos).search(regex)
@@ -143,12 +143,12 @@ export function compileFileOrFiles(filename: string, isDirectory: boolean, opts:
  * @dev Compile contract source before running tests (used for IDE tests execution)
  * @param sources sources
  * @param versionUrl url of selected compiler version to load
- * @param usingWorker if true, load compiler using web worker
+ * @param compilerConfig current compiler configuration
  * @param importFileCb Import file callback
  * @param opts Options
  * @param cb Callback
  */
-export function compileContractSources(sources: SrcIfc, versionUrl: any, usingWorker: boolean, importFileCb: any, opts: any, cb: Function) {
+export function compileContractSources(sources: SrcIfc, compilerConfig: CompilerConfiguration, importFileCb: any, opts: any, cb: Function) {
     let compiler, filepath: string
     const accounts: string[] = opts.accounts || []
     // Iterate over sources keys. Inject test libraries. Inject test library import statements.
@@ -169,8 +169,11 @@ export function compileContractSources(sources: SrcIfc, versionUrl: any, usingWo
 
     async.waterfall([
         function loadCompiler (next: Function) {
+            const {currentCompilerUrl, evmVersion, optimize, usingWorker} = compilerConfig
             compiler = new RemixCompiler(importFileCb)
-            compiler.loadVersion(usingWorker, versionUrl)
+            compiler.set('evmVersion', evmVersion)
+            compiler.set('optimize', optimize)
+            compiler.loadVersion(usingWorker, currentCompilerUrl)
             // @ts-ignore
             compiler.event.register('compilerLoaded', this, (version) => {
                 next()
diff --git a/remix-tests/src/runTestSources.ts b/remix-tests/src/runTestSources.ts
index 6c88c4008e..1d1d6f853f 100644
--- a/remix-tests/src/runTestSources.ts
+++ b/remix-tests/src/runTestSources.ts
@@ -7,7 +7,8 @@ import { runTest } from './testRunner'
 
 import Web3 from 'web3';
 import { Provider } from 'remix-simulator'
-import { FinalResult, SrcIfc, compilationInterface, ASTInterface, Options, TestResultInterface, AstNode } from './types'
+import { FinalResult, SrcIfc, compilationInterface, ASTInterface, Options, 
+    TestResultInterface, AstNode, CompilerConfiguration } from './types'
 
 const createWeb3Provider = async function () {
     let web3 = new Web3()
@@ -20,15 +21,14 @@ const createWeb3Provider = async function () {
 /**
  * @dev Run tests from source of a test contract file (used for IDE)
  * @param contractSources Sources of contract
- * @param versionUrl url of selected compiler version to load
- * @param usingWorker if true, load compiler using web worker
+ * @param compilerConfig current compiler configuration
  * @param testCallback Test callback
  * @param resultCallback Result Callback
  * @param finalCallback Final Callback
  * @param importFileCb Import file callback
  * @param opts Options
  */
-export async function runTestSources(contractSources: SrcIfc, versionUrl: string, usingWorker: boolean, testCallback: Function, resultCallback: Function, finalCallback: any, importFileCb: Function, opts: Options) {
+export async function runTestSources(contractSources: SrcIfc, compilerConfig: CompilerConfiguration, testCallback: Function, resultCallback: Function, finalCallback: any, importFileCb: Function, opts: Options) {
     opts = opts || {}
     const sourceASTs: any = {}
     let web3 = opts.web3 || await createWeb3Provider()
@@ -42,7 +42,7 @@ export async function runTestSources(contractSources: SrcIfc, versionUrl: string
             })
         },
         function compile (next) {
-            compileContractSources(contractSources, versionUrl, usingWorker, importFileCb, { accounts }, next)
+            compileContractSources(contractSources, compilerConfig, importFileCb, { accounts }, next)
         },
         function deployAllContracts (compilationResult: compilationInterface, asts: ASTInterface, next) {
             for(const filename in asts) {
diff --git a/remix-tests/src/types.ts b/remix-tests/src/types.ts
index 89e56d3fe4..8a791cf46f 100644
--- a/remix-tests/src/types.ts
+++ b/remix-tests/src/types.ts
@@ -44,6 +44,13 @@ export interface Options {
   web3?: any
 }
 
+export interface CompilerConfiguration {
+  currentCompilerUrl: string,
+  evmVersion: string, 
+  optimize: boolean, 
+  usingWorker: boolean
+}
+
 /** sources object with name of the file and content **/
 
 ////////////