/// <summary>
        /// Visit a parse tree produced by <see cref="Z80TestParser.testBlock"/>.
        /// <para>
        /// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
        /// on <paramref name="context"/>.
        /// </para>
        /// </summary>
        /// <param name="context">The parse tree.</param>
        /// <return>The visitor result.</return>
        public override object VisitTestBlock(Z80TestParser.TestBlockContext context)
        {
            if (IsInvalidContext(context))
            {
                return(null);
            }

            var node = new TestBlockNode(context);

            if (context.testOptions() != null)
            {
                node.TestOptions = (TestOptionsNode)VisitTestOptions(context.testOptions());
            }
            if (context.testParams() != null)
            {
                node.Params = (ParamsNode)VisitTestParams(context.testParams());
            }
            foreach (var testCase in context.testCase())
            {
                node.Cases.Add((TestCaseNode)VisitTestCase(testCase));
            }
            if (context.arrange() != null)
            {
                node.Arrange = (AssignmentsNode)VisitArrange(context.arrange());
            }
            node.Act = (InvokeCodeNode)VisitAct(context.act());
            if (context.breakpoint() != null)
            {
                node.Breakpoints = (BreakpointsNode)VisitBreakpoint(context.breakpoint());
            }
            if (context.assert() != null)
            {
                node.Assert = (AssertNode)VisitAssert(context.assert());
            }
            return(node);
        }