server.requestClientAuth()
    server.enqueue(
      MockResponse
        .Builder()
        .body("abc")
        .build(),
    )
    val call = client.newCall(Request.Builder().url(server.url("/")).build())
    val response = call.execute()
    assertThat(response.handshake!!.peerPrincipal)
      .isEqualTo(X500Principal("CN=Local Host"))
    assertThat(response.handshake!!.localPrincipal)

An example could be that you have an external authentication provider that you need to call.

You send it a token and it returns an authenticated user.

This provider might be charging you per request, and calling it might take some extra time than if you had a fixed mock user for tests.

You probably want to test the external provider once, but not necessarily call it for every test that runs.

        sub_dependant.call = cast(Callable[..., Any], sub_dependant.call)
        call = sub_dependant.call
        use_sub_dependant = sub_dependant
        if (
            dependency_overrides_provider
            and dependency_overrides_provider.dependency_overrides
        ):
            original_call = sub_dependant.call
            call = getattr(

	JMP	label0+0	// JMP 66
	BEQ	R1, 2(PC)
	JAL	1(PC)	// CALL 1(PC)
	BEQ	R1, 2(PC)
	JAL	label0+0	// CALL 66

	//	LBRA addr
	//	{
	//		outcode(int($1), &nullgen, 0, &$2);
	//	}
	BEQ	R1, 2(PC)
	JMP	0(R1)	// JMP (R1)
	BEQ	R1, 2(PC)
	JMP	foo+0(SB)	// JMP foo(SB)
	BEQ	R1, 2(PC)
	JAL	0(R1)	// CALL (R1)
	BEQ	R1, 2(PC)
	JAL	foo+0(SB)	// CALL foo(SB)

//
// BEQ/BNE
//
//	LBRA rreg ',' rel

    private void checkOutputContains(MethodCallExpression call) {
        ASTNode receiver = call.getReceiver();
        if (receiver instanceof PropertyExpression) {
            if (((PropertyExpression) receiver).getPropertyAsString().equals("output")) {
                Expression objectExpr = ((PropertyExpression) receiver).getObjectExpression();
                checkIndirectOutputContains(objectExpr, call);
            }
        }
    }

   * {@link MoreExecutors#directExecutor}. Normally, when the first future completes, all the other
   * tasks would be called recursively. Here, we detect that the delegate executor is executing
   * inline, and maintain a queue to dispatch tasks iteratively. There is one instance of this class
   * per call to submit() or submitAsync(), and each instance supports only one call to execute().
   *

        override fun connectionAcquired(
          call: Call,
          connection: Connection,
        ) {
          // We have the connection and it's in the pool. Let request2 proceed to make a connection.
          latch2.countDown()
        }
      }
    val request2Listener: EventListener =
      object : EventListener() {
        override fun connectStart(
          call: Call,
          inetSocketAddress: InetSocketAddress,

    val promise = CompletableFuture<Response>()

    val call = client.newCall(request)
    call.enqueue(
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {
          promise.completeExceptionally(e)
        }

        override fun onResponse(
          call: Call,
          response: Response,
        ) {

        // Second call (even) should fail
        String result2 = aggregateLogJob.execute();
        assertTrue(result2.contains("Even call error"));

        // Third call (odd) should succeed
        String result3 = aggregateLogJob.execute();
        assertEquals("", result3);
    }

    @Test
    public void test_execute_performanceWithLargeErrorMessage() {
        // Test with very large error message

        if self.call is None:
            return False  # pragma: no cover
        if inspect.isgeneratorfunction(
            _impartial(self.call)
        ) or inspect.isgeneratorfunction(_unwrapped_call(self.call)):
            return True
        if inspect.isclass(_unwrapped_call(self.call)):
            return False
        dunder_call = getattr(_impartial(self.call), "__call__", None)  # noqa: B004