[JS IR BE] Add tests for main function

js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java

@@ -5238,6 +5238,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("js/js.translator/testData/box/main"), Pattern.compile("^([^_](.+))\\.kt$"), TargetBackend.JS_IR, true);
         }
 
+        @TestMetadata("differentMains.kt")
+        public void testDifferentMains() throws Exception {
+            runTest("js/js.translator/testData/box/main/differentMains.kt");
+        }
+
         @TestMetadata("incremental.kt")
         public void testIncremental() throws Exception {
             runTest("js/js.translator/testData/box/main/incremental.kt");
@@ -5267,6 +5272,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
         public void testSuspendMainThrows() throws Exception {
             runTest("js/js.translator/testData/box/main/suspendMainThrows.kt");
         }
+
+        @TestMetadata("twoMains.kt")
+        public void testTwoMains() throws Exception {
+            runTest("js/js.translator/testData/box/main/twoMains.kt");
+        }
     }
 
     @TestMetadata("js/js.translator/testData/box/multiFile")

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -5243,6 +5243,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("js/js.translator/testData/box/main"), Pattern.compile("^([^_](.+))\\.kt$"), TargetBackend.JS, true);
         }
 
+        @TestMetadata("differentMains.kt")
+        public void testDifferentMains() throws Exception {
+            runTest("js/js.translator/testData/box/main/differentMains.kt");
+        }
+
         @TestMetadata("incremental.kt")
         public void testIncremental() throws Exception {
             runTest("js/js.translator/testData/box/main/incremental.kt");
@@ -5272,6 +5277,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
         public void testSuspendMainThrows() throws Exception {
             runTest("js/js.translator/testData/box/main/suspendMainThrows.kt");
         }
+
+        @TestMetadata("twoMains.kt")
+        public void testTwoMains() throws Exception {
+            runTest("js/js.translator/testData/box/main/twoMains.kt");
+        }
     }
 
     @TestMetadata("js/js.translator/testData/box/multiFile")

js/js.translator/testData/box/main/differentMains.kt

@@ -0,0 +1,23 @@
+// EXPECTED_REACHABLE_NODES: 1281
+// CALL_MAIN
+
+var ok: String = "OK"
+
+fun main(args: Array<Int>) {
+    ok += "Fail Int"
+}
+
+fun main(args: Array<String?>) {
+    ok += "Fail String?"
+}
+
+fun main(args: Array<in String>) {
+    ok += "Fail IN"
+}
+
+fun main(args: Array<String>): Unit? {
+    ok += "Fail return Unit?"
+    return Unit
+}
+
+fun box() = ok

js/js.translator/testData/box/main/twoMains.kt

@@ -0,0 +1,18 @@
+// EXPECTED_REACHABLE_NODES: 1281
+// CALL_MAIN
+
+var o: String = "fail O"
+var k: String = "K"
+
+fun main() {
+    k = "fail K"
+}
+
+fun main(args: Array<String>) {
+    assertEquals(1, args.size)
+    assertEquals("testArg", args[0])
+
+    o = "O"
+}
+
+fun box() = o + k