[JS] [tests] Look for properties in local.properties

js/js.tests/build.gradle.kts

@@ -6,6 +6,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinUsages
 import org.jetbrains.kotlin.gradle.targets.js.d8.D8RootPlugin
 import org.jetbrains.kotlin.ideaExt.idea
 import org.apache.tools.ant.filters.FixCrLfFilter
+import java.util.Properties
 
 plugins {
     kotlin("jvm")
@@ -327,10 +328,18 @@ fun Test.setUpBoxTests() {
     systemProperty("overwrite.output", project.providers.gradleProperty("overwrite.output")
         .forUseAtConfigurationTime().orNull ?: "false")
 
-    val prefixForPpropertiesToForward = "fd."
-    for ((key, value) in properties) {
-        if (key.startsWith(prefixForPpropertiesToForward)) {
-            systemProperty(key.substring(prefixForPpropertiesToForward.length), value!!)
+    val localProperties = Properties().apply {
+        project.file("local.properties").takeIf { it.isFile }?.inputStream()?.use {
+            load(it)
+        }
+    }
+
+    val allProperties = localProperties + properties
+
+    val prefixForPropertiesToForward = "fd."
+    for ((key, value) in allProperties) {
+        if (key is String && key.startsWith(prefixForPropertiesToForward)) {
+            systemProperty(key.substring(prefixForPropertiesToForward.length), value!!)
         }
     }
 }