added tests of println override

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "1.5.0-SNAPSHOT"
+version = "1.5.1-SNAPSHOT"
 
 // Removed legacy buildscript classpath declarations; plugins are applied via the plugins DSL below
 

lynglib/src/commonTest/kotlin/net/sergeych/lyng/PrintlnOverrideTest.kt

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package net.sergeych.lyng
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.bridge.globalBinder
+import net.sergeych.lyng.obj.ObjVoid
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class PrintlnOverrideTest {
+
+    @Test
+    fun testPrintlnOverrideWithAddFn() = runTest {
+        val scope = Script.newScope()
+        val output = mutableListOf<String>()
+
+        // Override println with addFn
+        scope.addFn("println") {
+            val list = mutableListOf<String>()
+            for (a in args.list) {
+                list.add(toStringOf(a).value)
+            }
+            output.add(list.joinToString(" "))
+            ObjVoid
+        }
+
+        scope.createChildScope().eval("""
+            println("top level")
+            fun nested() {
+                println("inside function")
+                fun deep_nested() {
+                    println("deeply nested")
+                }
+                deep_nested()
+            }
+            nested()
+            if (true) {
+                println("inside block")
+            }
+        """.trimIndent())
+
+        assertEquals(listOf("top level", "inside function", "deeply nested", "inside block"), output)
+    }
+
+    @Test
+    fun testPrintlnOverrideWithGlobalBinder() = runTest {
+        val scope = Script.newScope()
+        val output = mutableListOf<String>()
+
+        // Override println with globalBinder
+        scope.globalBinder().bindGlobalFun("println") {
+            val sb = StringBuilder()
+            for (i in 0 until args.size) {
+                if (i > 0) sb.append(" ")
+                sb.append(string(i))
+            }
+            output.add(sb.toString())
+            ObjVoid
+        }
+
+        scope.eval("""
+            println("gb top level")
+            fun gb_nested() {
+                println("gb inside function")
+            }
+            gb_nested()
+        """.trimIndent())
+
+        assertEquals(listOf("gb top level", "gb inside function"), output)
+    }
+}