// distributed trace contexts to propagate with envoy.
func openCensusAgentContextConverter(contexts []meshAPI.Tracing_OpenCensusAgent_TraceContext) convertFunc {
	allContexts := `["TRACE_CONTEXT","GRPC_TRACE_BIN","CLOUD_TRACE_CONTEXT","B3"]`
	return func(*instance) (any, error) {
		if len(contexts) == 0 {
			return allContexts, nil
		}

		var envoyContexts []string
		for _, c := range contexts {
			switch c {

		{
			testName: "openCensusAgent empty context",
			key:      "openCensusAgentContexts",
			option:   option.OpenCensusAgentContexts([]meshAPI.Tracing_OpenCensusAgent_TraceContext{}),
			expected: `["TRACE_CONTEXT","GRPC_TRACE_BIN","CLOUD_TRACE_CONTEXT","B3"]`,
		},
		{
			testName: "openCensusAgent order context",
			key:      "openCensusAgentContexts",
			option: option.OpenCensusAgentContexts([]meshAPI.Tracing_OpenCensusAgent_TraceContext{