RCTModuleMethodTests.mm

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import <React/RCTUIKit.h> // [macOS]
#import <XCTest/XCTest.h>

#import <React/RCTBridgeModule.h>
#import <React/RCTLog.h>
#import <React/RCTModuleMethod.h>

static BOOL RCTLogsError(void (^block)(void))
{
  __block BOOL loggedError = NO;
  RCTPerformBlockWithLogFunction(
      block,
      ^(RCTLogLevel level,
        __unused RCTLogSource source,
        __unused NSString *fileName,
        __unused NSNumber *lineNumber,
        __unused NSString *message) {
        loggedError = (level == RCTLogLevelError);
      });
  return loggedError;
}

@interface RCTModuleMethodTests : XCTestCase <RCTBridgeModule>

@end

@implementation RCTModuleMethodTests {
  CGRect _s;
}

static RCTModuleMethod *buildDefaultMethodWithMethodSignature(const char *methodSignature)
{
  // This leaks a RCTMethodInfo, but it's a test, so...
  RCTMethodInfo *methodInfo = new RCTMethodInfo{.objcName = methodSignature, .isSync = NO};
  return [[RCTModuleMethod alloc] initWithExportedMethod:methodInfo moduleClass:[RCTModuleMethodTests class]];
}

static RCTModuleMethod *buildSyncMethodWithMethodSignature(const char *methodSignature)
{
  // This leaks a RCTMethodInfo, but it's a test, so...
  RCTMethodInfo *methodInfo = new RCTMethodInfo{.objcName = methodSignature, .isSync = YES};
  return [[RCTModuleMethod alloc] initWithExportedMethod:methodInfo moduleClass:[RCTModuleMethodTests class]];
}

+ (NSString *)moduleName
{
  return nil;
}

- (void)doFoo
{
}

- (void)doFooWithBar:(__unused NSString *)bar
{
}

- (id)echoString:(NSString *)input
{
  return input;
}
- (id)methodThatReturnsNil
{
  return nil;
}
- (void)openURL:(NSURL *)URL resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject
{
}
- (void)openURL:(NSURL *)URL callback:(RCTResponseSenderBlock)callback
{
}
- (id)methodThatCallsCallbackWithArg:(NSString *)input callback:(RCTResponseSenderBlock)callback
{
  callback(@[ input ]);
  return nil;
}

- (void)testNonnull
{
  const char *methodSignature = "doFooWithBar:(nonnull NSString *)bar";
  RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
  XCTAssertFalse(RCTLogsError(^{
    [method invokeWithBridge:nil module:self arguments:@[ @"Hello World" ]];
  }));

  XCTAssertTrue(RCTLogsError(^{
    [method invokeWithBridge:nil module:self arguments:@[ [NSNull null] ]];
  }));
}

- (void)doFooWithNumber:(__unused NSNumber *)n
{
}
- (void)doFooWithDouble:(__unused double)n
{
}
- (void)doFooWithInteger:(__unused NSInteger)n
{
}
- (void)doFooWithCGRect:(CGRect)s
{
  _s = s;
}

- (void)doFoo:(__unused NSString *)foo
{
}

- (void)testNumbersNonnull
{
  {
    // Specifying an NSNumber param without nonnull isn't allowed
    XCTAssertTrue(RCTLogsError(^{
      const char *methodSignature = "doFooWithNumber:(NSNumber *)n";
      RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
      // Invoke method to trigger parsing
      [method invokeWithBridge:nil module:self arguments:@[ @1 ]];
    }));
  }

  {
    const char *methodSignature = "doFooWithNumber:(nonnull NSNumber *)n";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(RCTLogsError(^{
      [method invokeWithBridge:nil module:self arguments:@[ [NSNull null] ]];
    }));
  }

  {
    const char *methodSignature = "doFooWithDouble:(double)n";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(RCTLogsError(^{
      [method invokeWithBridge:nil module:self arguments:@[ [NSNull null] ]];
    }));
  }

  {
    const char *methodSignature = "doFooWithInteger:(NSInteger)n";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(RCTLogsError(^{
      [method invokeWithBridge:nil module:self arguments:@[ [NSNull null] ]];
    }));
  }
}

- (void)testStructArgument
{
  const char *methodSignature = "doFooWithCGRect:(CGRect)s";
  RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);

  CGRect r = CGRectMake(10, 20, 30, 40);
  [method invokeWithBridge:nil module:self arguments:@[ @[ @10, @20, @30, @40 ] ]];
  XCTAssertTrue(CGRectEqualToRect(r, _s));
}

- (void)testWhitespaceTolerance
{
  const char *methodSignature = "doFoo : \t (NSString *)foo";

  __block RCTModuleMethod *method;
  XCTAssertFalse(RCTLogsError(^{
    method = buildDefaultMethodWithMethodSignature(methodSignature);
  }));

  XCTAssertEqualObjects(@(method.JSMethodName), @"doFoo");

  XCTAssertFalse(RCTLogsError(^{
    [method invokeWithBridge:nil module:self arguments:@[ @"bar" ]];
  }));
}

- (void)testFunctionType
{
  {
    const char *methodSignature = "doFoo";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(method.functionType == RCTFunctionTypeNormal);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing normal function");
  }

  {
    const char *methodSignature = "openURL:(NSURL *)URL callback:(RCTResponseSenderBlock)callBack";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(method.functionType == RCTFunctionTypeNormal);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing normal function with callback");
  }

  {
    const char *methodSignature =
        "openURL:(NSURL *)URL resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject";
    RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(method.functionType == RCTFunctionTypePromise);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing promise function");
  }

  {
    const char *methodSignature = "echoString:(NSString *)input";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(method.functionType == RCTFunctionTypeSync);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing sync function");
  }

  {
    const char *methodSignature =
        "methodThatCallsCallbackWithArg:(NSString *)input callback:(RCTResponseSenderBlock)callback";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(method.functionType == RCTFunctionTypeSync);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing sync function with callback");
  }
}

- (void)testReturnsValueForSyncFunction
{
  {
    const char *methodSignature = "echoString:(NSString *)input";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    id result = [method invokeWithBridge:nil module:self arguments:@[ @"Test String Value" ]];
    XCTAssertEqualObjects(result, @"Test String Value");
  }

  {
    const char *methodSignature = "methodThatReturnsNil";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    id result = [method invokeWithBridge:nil module:self arguments:@[]];
    XCTAssertNil(result);
  }
}

- (void)testReturnsNilForDefaultFunction
{
  const char *methodSignature = "doFoo";
  RCTModuleMethod *method = buildDefaultMethodWithMethodSignature(methodSignature);
  id result = [method invokeWithBridge:nil module:self arguments:@[]];
  XCTAssertNil(result);
}

- (void)testReturnTypeForSyncFunction
{
  {
    const char *methodSignature = "methodThatReturnsNil";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    XCTAssertFalse(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Unexpected error when parsing sync function with (id) return type");
  }

  {
    const char *methodSignature = "doFoo";
    RCTModuleMethod *method = buildSyncMethodWithMethodSignature(methodSignature);
    XCTAssertTrue(
        RCTLogsError(^{
          // Invoke method to trigger parsing
          __unused SEL selector = method.selector;
        }),
        @"Failed to trigger an error when parsing sync function with non-(id) return type");
  }
}

@end