### Question:
OpenTelemetry { public static void setPropagators(ContextPropagators propagators) { Objects.requireNonNull(propagators, "propagators"); getInstance().propagators = propagators; } private  OpenTelemetry(); static TracerProvider getTracerProvider(); static Tracer getTracer(String instrumentationName); static Tracer getTracer(String instrumentationName, String instrumentationVersion); static MeterProvider getMeterProvider(); static Meter getMeter(String instrumentationName); static Meter getMeter(String instrumentationName, String instrumentationVersion); static BaggageManager getBaggageManager(); static ContextPropagators getPropagators(); static void setPropagators(ContextPropagators propagators);  }### Answer:
@Test void testPropagatorsSetNull() { assertThrows(NullPointerException.class, () -> OpenTelemetry.setPropagators(null)); }