KJS: fix JS backend tests on windows

js/js.tests/test/org/jetbrains/kotlin/js/test/NashornJsTestChecker.kt

@@ -28,7 +28,7 @@ fun createScriptEngine(): ScriptEngine =
         NashornScriptEngineFactory().getScriptEngine("--language=es5", "--no-java", "--no-syntax-extensions")
 
 private fun ScriptEngine.loadFile(path: String) {
-    eval("load('$path');")
+    eval("load('${path.replace('\\', '/')}');")
 }
 
 private fun ScriptObjectMirror.toMapWithAllMembers(): Map<String, Any?> = getOwnKeys(true).associate { it to this[it] }

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/AbstractWebDemoExamplesTest.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.js.test.semantics
 
 import com.google.common.collect.Lists
+import com.intellij.openapi.util.text.StringUtil
 import org.jetbrains.kotlin.js.facade.MainCallParameters
 import org.jetbrains.kotlin.js.test.BasicBoxTest
 import org.jetbrains.kotlin.js.test.NashornJsTestChecker
@@ -45,7 +46,7 @@ abstract class AbstractWebDemoExamplesTest(relativePath: String) : BasicBoxTest(
     }
 
     protected fun runMainAndCheckOutputWithExpectedFile(testName: String, testId: String, vararg args: String) {
-        val expectedResult = File(pathToTestDir + testName + testId + ".out").readText()
+        val expectedResult = StringUtil.convertLineSeparators(File(pathToTestDir + testName + testId + ".out").readText())
         doTest(pathToTestDir + testName + ".kt", expectedResult, MainCallParameters.mainWithArguments(Lists.newArrayList(*args)))
     }
 }