Scripting loading tests and extension points

idea/testData/script/definition/loading/async/script.kts

@@ -0,0 +1 @@
+initial

idea/testData/script/definition/loading/async/template/template.kt

@@ -0,0 +1,42 @@
+package custom.scriptDefinition
+
+import kotlin.script.dependencies.*
+import kotlin.script.experimental.dependencies.*
+import kotlin.script.templates.*
+import java.io.File
+import kotlin.script.experimental.location.*
+
+class TestDependenciesResolver : AsyncDependenciesResolver {
+    suspend override fun resolveAsync(scriptContents: ScriptContents, environment: Environment): DependenciesResolver.ResolveResult {
+        val text = scriptContents.text as String
+
+        val result = when {
+            text.startsWith("#BAD:") -> DependenciesResolver.ResolveResult.Failure(
+                reports = listOf(ScriptReport(text))
+            )
+            else -> DependenciesResolver.ResolveResult.Success(
+                dependencies = ScriptDependencies(
+                    classpath = listOf(environment["template-classes"] as File),
+                    imports = listOf("x_" + text.replace(Regex("#IGNORE_IN_CONFIGURATION"), ""))
+                ),
+                reports = listOf(ScriptReport(text))
+            )
+        }
+
+        javaClass.classLoader
+            .loadClass("org.jetbrains.kotlin.idea.script.ScriptConfigurationLoadingTest")
+            .methods.single { it.name == "loadingScriptConfigurationCallback" }
+            .invoke(null)
+
+        return result
+    }
+}
+
+@ScriptExpectedLocations([ScriptExpectedLocation.Everywhere])
+@ScriptTemplateDefinition(TestDependenciesResolver::class, scriptFilePattern = "script.kts")
+class Template : Base()
+
+open class Base {
+    val i = 3
+    val str = ""
+}