diff --git a/backend.native/tests/build.gradle b/backend.native/tests/build.gradle
index d57ffc71554..e3fb13cb5ba 100644
--- a/backend.native/tests/build.gradle
+++ b/backend.native/tests/build.gradle
@@ -464,11 +464,66 @@ task boxing0(type: RunKonanTest) {
     source = "codegen/boxing/boxing0.kt"
 }
 
-task boxing1 (type:RunKonanTest) {
-    disabled = true
+task boxing1(type: RunKonanTest) {
+    goldValue = "1\nfalse\nHello\n"
     source = "codegen/boxing/boxing1.kt"
 }
 
+task boxing2(type: RunKonanTest) {
+    goldValue = "1\ntrue\nother\n"
+    source = "codegen/boxing/boxing2.kt"
+}
+
+task boxing3(type: RunKonanTest) {
+    goldValue = "42\n"
+    source = "codegen/boxing/boxing3.kt"
+}
+
+task boxing4(type: RunKonanTest) {
+    goldValue = "16\n"
+    source = "codegen/boxing/boxing4.kt"
+}
+
+task boxing5(type: RunKonanTest) {
+    goldValue = "16\n42\n"
+    source = "codegen/boxing/boxing5.kt"
+}
+
+task boxing6(type: RunKonanTest) {
+    goldValue = "42\n16\n"
+    source = "codegen/boxing/boxing6.kt"
+}
+
+task boxing7(type: RunKonanTest) {
+    goldValue = "1\n0\n"
+    source = "codegen/boxing/boxing7.kt"
+}
+
+task boxing8(type: RunKonanTest) {
+    goldValue = "1\n<null>\ntrue\nHello\n"
+    source = "codegen/boxing/boxing8.kt"
+}
+
+task boxing9(type: RunKonanTest) {
+    goldValue = "1\n<null>\ntrue\nHello\n2\n<null>\ntrue\nHello\n3\n"
+    source = "codegen/boxing/boxing9.kt"
+}
+
+task boxing10(type: RunKonanTest) {
+    goldValue = "Ok\n"
+    source = "codegen/boxing/boxing10.kt"
+}
+
+task boxing11(type: RunKonanTest) {
+    goldValue = "17\n42\n"
+    source = "codegen/boxing/boxing11.kt"
+}
+
+task boxing12(type: RunKonanTest) {
+    goldValue = "18\n"
+    source = "codegen/boxing/boxing12.kt"
+}
+
 task interface0(type: RunKonanTest) {
     goldValue = "PASSED\n"
     source = "runtime/basic/interface0.kt"
diff --git a/backend.native/tests/codegen/boxing/boxing10.kt b/backend.native/tests/codegen/boxing/boxing10.kt
new file mode 100644
index 00000000000..38969157078
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing10.kt
@@ -0,0 +1,9 @@
+fun main(args: Array<String>) {
+    val FALSE: Boolean? = false
+
+    if (FALSE != null) {
+        do {
+            println("Ok")
+        } while (FALSE)
+    }
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing11.kt b/backend.native/tests/codegen/boxing/boxing11.kt
new file mode 100644
index 00000000000..c61e4bfb315
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing11.kt
@@ -0,0 +1,12 @@
+fun printInt(x: Int) = println(x)
+
+class Foo(val value: Int?) {
+    fun foo() {
+        printInt(if (value != null) value else 42)
+    }
+}
+
+fun main(args: Array<String>) {
+    Foo(17).foo()
+    Foo(null).foo()
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing12.kt b/backend.native/tests/codegen/boxing/boxing12.kt
new file mode 100644
index 00000000000..631b01202b0
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing12.kt
@@ -0,0 +1,7 @@
+fun foo(x: Number) {
+    println(x.toByte())
+}
+
+fun main(args: Array<String>) {
+    foo(18)
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing2.kt b/backend.native/tests/codegen/boxing/boxing2.kt
new file mode 100644
index 00000000000..eba3ae6c41b
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing2.kt
@@ -0,0 +1,17 @@
+fun printInt(x: Int) = println(x)
+fun printBoolean(x: Boolean) = println(x)
+
+fun foo(arg: Any) {
+    if (arg is Int)
+        printInt(arg)
+    else if (arg is Boolean)
+        printBoolean(arg)
+    else
+        println("other")
+}
+
+fun main(args: Array<String>) {
+    foo(1)
+    foo(true)
+    foo("Hello")
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing3.kt b/backend.native/tests/codegen/boxing/boxing3.kt
new file mode 100644
index 00000000000..c478a0b6875
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing3.kt
@@ -0,0 +1,10 @@
+fun printInt(x: Int) = println(x)
+
+fun foo(arg: Int?) {
+    if (arg != null)
+        printInt(arg)
+}
+
+fun main(args: Array<String>) {
+    foo(42)
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing4.kt b/backend.native/tests/codegen/boxing/boxing4.kt
new file mode 100644
index 00000000000..0874d210e66
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing4.kt
@@ -0,0 +1,10 @@
+fun printInt(x: Int) = println(x)
+
+fun foo(arg: Any?) {
+    if (arg is Int? && arg != null)
+        printInt(arg)
+}
+
+fun main(args: Array<String>) {
+    foo(16)
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing5.kt b/backend.native/tests/codegen/boxing/boxing5.kt
new file mode 100644
index 00000000000..1efc3114287
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing5.kt
@@ -0,0 +1,10 @@
+fun printInt(x: Int) = println(x)
+
+fun foo(arg: Int?) {
+    printInt(arg ?: 16)
+}
+
+fun main(args: Array<String>) {
+    foo(null)
+    foo(42)
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing6.kt b/backend.native/tests/codegen/boxing/boxing6.kt
new file mode 100644
index 00000000000..7d0a4d47115
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing6.kt
@@ -0,0 +1,10 @@
+fun printInt(x: Int) = println(x)
+
+fun foo(arg: Any) {
+    printInt(arg as? Int ?: 16)
+}
+
+fun main(args: Array<String>) {
+    foo(42)
+    foo("Hello")
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing7.kt b/backend.native/tests/codegen/boxing/boxing7.kt
new file mode 100644
index 00000000000..4230eb31fb8
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing7.kt
@@ -0,0 +1,15 @@
+fun printInt(x: Int) = println(x)
+
+fun foo(arg: Any) {
+    val argAsInt = try {
+        arg as Int
+    } catch (e: ClassCastException) {
+        0
+    }
+    printInt(argAsInt)
+}
+
+fun main(args: Array<String>) {
+    foo(1)
+    foo("Hello")
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing8.kt b/backend.native/tests/codegen/boxing/boxing8.kt
new file mode 100644
index 00000000000..e176cadf932
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing8.kt
@@ -0,0 +1,9 @@
+fun foo(vararg args: Any?) {
+    for (arg in args) {
+        println(arg.toString())
+    }
+}
+
+fun main(args: Array<String>) {
+    foo(1, null, true, "Hello")
+}
\ No newline at end of file
diff --git a/backend.native/tests/codegen/boxing/boxing9.kt b/backend.native/tests/codegen/boxing/boxing9.kt
new file mode 100644
index 00000000000..32fb9aa9e37
--- /dev/null
+++ b/backend.native/tests/codegen/boxing/boxing9.kt
@@ -0,0 +1,13 @@
+fun foo(vararg args: Any?) {
+    for (arg in args) {
+        println(arg.toString())
+    }
+}
+
+fun bar(vararg args: Any?) {
+    foo(1, *args, 2, *args, 3)
+}
+
+fun main(args: Array<String>) {
+    bar(null, true, "Hello")
+}
\ No newline at end of file