https://www.graalvm.org/ 
public class com.oracle.truffle.js.test.runtime.TestHelperTest extends com.oracle.truffle.js.test.JSTest
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.js.test.runtime.TestHelperTest
  super_class: com.oracle.truffle.js.test.JSTest
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 57
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.test.JSTest.<init>:()V
            return
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;

  public void testTestHelper();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 61
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            invokevirtual com.oracle.truffle.js.test.TestHelper.getGlobalObject:()Lcom/oracle/truffle/api/object/DynamicObject;
            getstatic com.oracle.truffle.js.runtime.objects.Undefined.instance:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
            if_acmpeq 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: invokestatic org.junit.Assert.assertTrue:(Z)V
         3: .line 62
            dconst_1
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "1.0"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runDouble:(Ljava/lang/String;)D
            ldc 1.0E-5
            invokestatic org.junit.Assert.assertEquals:(DDD)V
         4: .line 63
            iconst_1
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "true"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runBoolean:(Ljava/lang/String;)Z
            invokestatic java.lang.Boolean.valueOf:(Z)Ljava/lang/Boolean;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         5: .line 64
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "undefined"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runExpectUndefined:(Ljava/lang/String;)Z
            invokestatic org.junit.Assert.assertTrue:(Z)V
         6: .line 65
            ldc "bar\n"
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "print('bar')"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runToString:(Ljava/lang/String;)Ljava/lang/String;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         7: .line 66
            ldc "test"
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "print('NOT VISIBLE ON CONSOLE'); 'test';"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runSilent:(Ljava/lang/String;)Ljava/lang/Object;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         8: .line 67
            return
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    9     0  this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;
    RuntimeVisibleAnnotations: 
      org.junit.Test()

  public void testBinding();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 71
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "__foo__"
            ldc "bar"
            invokevirtual com.oracle.truffle.js.test.TestHelper.putBinding:(Ljava/lang/String;Ljava/lang/Object;)V
         1: .line 72
            aconst_null
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "__foo__"
            invokevirtual com.oracle.truffle.js.test.TestHelper.getBinding:(Ljava/lang/String;)Ljava/lang/Object;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         2: .line 74
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "var __foo__ = 'set';"
            invokevirtual com.oracle.truffle.js.test.TestHelper.run:(Ljava/lang/String;)Ljava/lang/Object;
            pop
         3: .line 76
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "__foo__"
            ldc "bar"
            invokevirtual com.oracle.truffle.js.test.TestHelper.putBinding:(Ljava/lang/String;Ljava/lang/Object;)V
         4: .line 77
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "__foo__+=42"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runVoid:(Ljava/lang/String;)V
         5: .line 78
            ldc "bar42"
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "__foo__"
            invokevirtual com.oracle.truffle.js.test.TestHelper.getBinding:(Ljava/lang/String;)Ljava/lang/Object;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         6: .line 79
            return
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;
    RuntimeVisibleAnnotations: 
      org.junit.Test()

  public void testTestHelperArray();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 83
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "[1,2,3]"
            invokevirtual com.oracle.truffle.js.test.TestHelper.runJSArray:(Ljava/lang/String;)Lcom/oracle/truffle/api/object/DynamicObject;
            astore 1 /* arr */
        start local 1 // com.oracle.truffle.api.object.DynamicObject arr
         1: .line 84
            aload 1 /* arr */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArray.isJSArray:(Ljava/lang/Object;)Z
            invokestatic org.junit.Assert.assertTrue:(Z)V
         2: .line 85
            aload 1 /* arr */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArray.toArray:(Lcom/oracle/truffle/api/object/DynamicObject;)[Ljava/lang/Object;
            astore 2 /* javaArr */
        start local 2 // java.lang.Object[] javaArr
         3: .line 86
            ldc 3
            aload 2 /* javaArr */
            arraylength
            i2l
            invokestatic org.junit.Assert.assertEquals:(JJ)V
         4: .line 87
            iconst_1
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 2 /* javaArr */
            iconst_0
            aaload
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         5: .line 88
            iconst_2
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 2 /* javaArr */
            iconst_1
            aaload
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         6: .line 89
            iconst_3
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 2 /* javaArr */
            iconst_2
            aaload
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         7: .line 90
            return
        end local 2 // java.lang.Object[] javaArr
        end local 1 // com.oracle.truffle.api.object.DynamicObject arr
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    8     0     this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;
            1    8     1      arr  Lcom/oracle/truffle/api/object/DynamicObject;
            3    8     2  javaArr  [Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      org.junit.Test()

  public void testParseFirstFunction();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 94
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            ldc "function fn(a) { return a; }"
            invokevirtual com.oracle.truffle.js.test.TestHelper.parseFirstFunction:(Ljava/lang/String;)Lcom/oracle/truffle/js/test/TestHelper$ParsedFunction;
            astore 1 /* fn */
        start local 1 // com.oracle.truffle.js.test.TestHelper$ParsedFunction fn
         1: .line 95
            ldc "fn"
            aload 1 /* fn */
            invokevirtual com.oracle.truffle.js.test.TestHelper$ParsedFunction.getRootNode:()Lcom/oracle/truffle/api/nodes/RootNode;
            invokevirtual com.oracle.truffle.api.nodes.RootNode.getName:()Ljava/lang/String;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         2: .line 96
            return
        end local 1 // com.oracle.truffle.js.test.TestHelper$ParsedFunction fn
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;
            1    3     1    fn  Lcom/oracle/truffle/js/test/TestHelper$ParsedFunction;
    RuntimeVisibleAnnotations: 
      org.junit.Test()

  public void testAssumeES6();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
         0: .line 100
            aload 0 /* this */
            getfield com.oracle.truffle.js.test.runtime.TestHelperTest.testHelper:Lcom/oracle/truffle/js/test/TestHelper;
            invokevirtual com.oracle.truffle.js.test.TestHelper.assumeES6OrLater:()V
         1: .line 101
            return
        end local 0 // com.oracle.truffle.js.test.runtime.TestHelperTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/js/test/runtime/TestHelperTest;
    RuntimeVisibleAnnotations: 
      org.junit.Test()
}
SourceFile: "TestHelperTest.java"
InnerClasses:
  public ParsedFunction = com.oracle.truffle.js.test.TestHelper$ParsedFunction of com.oracle.truffle.js.test.TestHelper