diff --git a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/test/ScriptEvaluationTest.kt b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/test/ScriptEvaluationTest.kt
index 7348b8829d6..2ce7eeb4517 100644
--- a/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/test/ScriptEvaluationTest.kt
+++ b/plugins/scripting/scripting-compiler/tests/org/jetbrains/kotlin/scripting/compiler/test/ScriptEvaluationTest.kt
@@ -3,7 +3,13 @@ import kotlinx.coroutines.runBlocking
 import org.jetbrains.kotlin.scripting.compiler.plugin.impl.ScriptJvmCompilerIsolated
 import org.jetbrains.kotlin.scripting.compiler.test.assertEqualsTrimmed
 import java.io.ByteArrayOutputStream
+import java.io.File
+import java.io.InputStream
 import java.io.PrintStream
+import java.nio.file.attribute.FileTime
+import java.util.zip.ZipEntry
+import java.util.zip.ZipFile
+import java.util.zip.ZipOutputStream
 import kotlin.script.experimental.api.*
 import kotlin.script.experimental.host.toScriptSource
 import kotlin.script.experimental.jvm.BasicJvmScriptEvaluator
@@ -19,7 +25,7 @@ import kotlin.script.experimental.jvm.util.renderError
 class ScriptEvaluationTest : TestCase() {
 
     fun testExceptionWithCause() {
-        checkEvaluate(
+        checkEvaluateAsError(
             """
                 try {
                     throw Exception("Error!")
@@ -36,15 +42,40 @@ class ScriptEvaluationTest : TestCase() {
         )
     }
 
-    private fun checkEvaluate(script: SourceCode, expectedOutput: String) {
-        val compilationConfiguration = ScriptCompilationConfiguration()
-        val compiler = ScriptJvmCompilerIsolated(defaultJvmScriptingHostConfiguration)
-        val compiled = compiler.compile(script, compilationConfiguration).valueOrThrow()
-        val evaluationConfiguration = ScriptEvaluationConfiguration()
-        val evaluator = BasicJvmScriptEvaluator()
-        val res = runBlocking {
-            evaluator.invoke(compiled, evaluationConfiguration).valueOrThrow()
+    // KT-19423
+    fun testClassCapturingScriptInstance() {
+        val res = checkEvaluate(
+            """
+                val used = "abc"
+                class User {
+                    val property = used
+                }
+
+                User().property
+            """.trimIndent().toScriptSource()
+        )
+        assertEquals("abc", (res.returnValue as ResultValue.Value).value)
+    }
+
+    fun testObjectCapturingScriptInstance() {
+        val res = checkCompile(
+            """
+                val used = "abc"
+                object User {
+                    val property = used
+                }
+
+                User.property
+            """.trimIndent().toScriptSource()
+        )
+        assertTrue(res is ResultWithDiagnostics.Failure)
+        if (!res.reports.any { it.message == "Object User captures the script class instance. Try to use class or anonymous object instead" }) {
+            fail("expecting error about object capturing script instance, got:\n  ${res.reports.joinToString("\n  ") { it.message }}")
         }
+    }
+
+    private fun checkEvaluateAsError(script: SourceCode, expectedOutput: String): EvaluationResult {
+        val res = checkEvaluate(script)
         assert(res.returnValue is ResultValue.Error)
         ByteArrayOutputStream().use { os ->
             val ps = PrintStream(os)
@@ -52,5 +83,22 @@ class ScriptEvaluationTest : TestCase() {
             ps.flush()
             assertEqualsTrimmed(expectedOutput, os.toString())
         }
+        return res
+    }
+
+    private fun checkCompile(script: SourceCode): ResultWithDiagnostics<CompiledScript> {
+        val compilationConfiguration = ScriptCompilationConfiguration()
+        val compiler = ScriptJvmCompilerIsolated(defaultJvmScriptingHostConfiguration)
+        return compiler.compile(script, compilationConfiguration)
+    }
+
+    private fun checkEvaluate(script: SourceCode): EvaluationResult {
+        val compiled = checkCompile(script).valueOrThrow()
+        val evaluationConfiguration = ScriptEvaluationConfiguration()
+        val evaluator = BasicJvmScriptEvaluator()
+        val res = runBlocking {
+            evaluator.invoke(compiled, evaluationConfiguration).valueOrThrow()
+        }
+        return res
     }
 }