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/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#import <UIKit/UIKit.h>
#import <XCTest/XCTest.h>

#import <gRPC/GRPCCall.h>
#import <gRPC/GRPCMethodName.h>
#import <gRPC/GRXWriter+Immediate.h>
#import <gRPC/GRXWriteable.h>
#import <RemoteTest/Messages.pbobjc.h>

// These are a few tests similar to InteropTests, but which use the generic gRPC client (GRPCCall)
// rather than a generated proto library on top of it.

@interface GRPCClientTests : XCTestCase
@end

@implementation GRPCClientTests

- (void)testConnectionToRemoteServer {
  __weak XCTestExpectation *expectation = [self expectationWithDescription:@"Server reachable."];

  // This method isn't implemented by the remote server.
  GRPCMethodName *method = [[GRPCMethodName alloc] initWithPackage:@"grpc.testing"
                                                         interface:@"TestService"
                                                            method:@"Nonexistent"];

  id<GRXWriter> requestsWriter = [GRXWriter writerWithValue:[NSData data]];

  GRPCCall *call = [[GRPCCall alloc] initWithHost:@"grpc-test.sandbox.google.com"
                                           method:method
                                   requestsWriter:requestsWriter];

  id<GRXWriteable> responsesWriteable = [[GRXWriteable alloc] initWithValueHandler:^(NSData *value) {
    XCTFail(@"Received unexpected response: %@", value);
  } completionHandler:^(NSError *errorOrNil) {
    XCTAssertNotNil(errorOrNil, @"Finished without error!");
    // TODO(jcanizales): The server should return code 12 UNIMPLEMENTED, not 5 NOT FOUND.
    XCTAssertEqual(errorOrNil.code, 5, @"Finished with unexpected error: %@", errorOrNil);
    [expectation fulfill];
  }];

  [call startWithWriteable:responsesWriteable];

  [self waitForExpectationsWithTimeout:2. handler:nil];
}

- (void)testEmptyRPC {
  __weak XCTestExpectation *response = [self expectationWithDescription:@"Empty response received."];
  __weak XCTestExpectation *completion = [self expectationWithDescription:@"Empty RPC completed."];

  GRPCMethodName *method = [[GRPCMethodName alloc] initWithPackage:@"grpc.testing"
                                                         interface:@"TestService"
                                                            method:@"EmptyCall"];

  id<GRXWriter> requestsWriter = [GRXWriter writerWithValue:[NSData data]];

  GRPCCall *call = [[GRPCCall alloc] initWithHost:@"grpc-test.sandbox.google.com"
                                           method:method
                                   requestsWriter:requestsWriter];

  id<GRXWriteable> responsesWriteable = [[GRXWriteable alloc] initWithValueHandler:^(NSData *value) {
    XCTAssertNotNil(value, @"nil value received as response.");
    XCTAssertEqual([value length], 0, @"Non-empty response received: %@", value);
    [response fulfill];
  } completionHandler:^(NSError *errorOrNil) {
    XCTAssertNil(errorOrNil, @"Finished with unexpected error: %@", errorOrNil);
    [completion fulfill];
  }];

  [call startWithWriteable:responsesWriteable];

  [self waitForExpectationsWithTimeout:2. handler:nil];
}

- (void)testSimpleProtoRPC {
  __weak XCTestExpectation *response = [self expectationWithDescription:@"Response received."];
  __weak XCTestExpectation *expectedResponse =
  [self expectationWithDescription:@"Expected response."];
  __weak XCTestExpectation *completion = [self expectationWithDescription:@"RPC completed."];

  GRPCMethodName *method = [[GRPCMethodName alloc] initWithPackage:@"grpc.testing"
                                                         interface:@"TestService"
                                                            method:@"UnaryCall"];

  RMTSimpleRequest *request = [[RMTSimpleRequest alloc] init];
  request.responseSize = 100;
  request.fillUsername = YES;
  request.fillOauthScope = YES;
  id<GRXWriter> requestsWriter = [GRXWriter writerWithValue:[request data]];

  GRPCCall *call = [[GRPCCall alloc] initWithHost:@"grpc-test.sandbox.google.com"
                                           method:method
                                   requestsWriter:requestsWriter];

  id<GRXWriteable> responsesWriteable = [[GRXWriteable alloc] initWithValueHandler:^(NSData *value) {
    XCTAssertNotNil(value, @"nil value received as response.");
    [response fulfill];
    XCTAssertGreaterThan(value.length, 0, @"Empty response received.");
    RMTSimpleResponse *response = [RMTSimpleResponse parseFromData:value error:NULL];
    // We expect empty strings, not nil:
    XCTAssertNotNil(response.username, @"Response's username is nil.");
    XCTAssertNotNil(response.oauthScope, @"Response's OAuth scope is nil.");
    [expectedResponse fulfill];
  } completionHandler:^(NSError *errorOrNil) {
    XCTAssertNil(errorOrNil, @"Finished with unexpected error: %@", errorOrNil);
    [completion fulfill];
  }];

  [call startWithWriteable:responsesWriteable];

  [self waitForExpectationsWithTimeout:2. handler:nil];
}

@end