Not provided key is represented as nil.

Author: Marcin Iwanicki

Source/OCGoogleDirectionsAPI/Client/OCDirectionsAPIClient.h

@@ -12,8 +12,6 @@
 #import "OCDirectionsRequestURLCreator.h"
 #import "OCDirectionsRequestURLCreatorJSON.h"
 
-extern NSString *const kOCDirectionsAPIClientAPIKeyNotProvided;
-
 typedef void (^OCDirectionsRequestCallback)(OCDirectionsResponse *response, NSError *error);
 
 @interface OCDirectionsAPIClient : NSObject

Source/OCGoogleDirectionsAPI/Client/OCDirectionsAPIClient.m

@@ -8,8 +8,6 @@
 
 #import "OCDirectionsAPIClient.h"
 
-NSString *const kOCDirectionsAPIClientAPIKeyNotProvided = @"";
-
 @interface OCDirectionsAPIClient ()
 
 @property (nonatomic, copy) NSString *key;
@@ -23,17 +21,17 @@ @implementation OCDirectionsAPIClient
 
 - (instancetype)init
 {
-	return [self initWithKey:_defaultKey?:kOCDirectionsAPIClientAPIKeyNotProvided];
+	return [self initWithKey:_defaultKey];
 }
 
 - (instancetype)initWithNoKey
 {
-	return [self initWithKey:kOCDirectionsAPIClientAPIKeyNotProvided];
+	return [self initWithKey:nil];
 }
 
 - (instancetype)initWithNoKeyUseHttps:(BOOL)useHttps
 {
-	return [self initWithKey:kOCDirectionsAPIClientAPIKeyNotProvided useHttps:useHttps];
+	return [self initWithKey:nil useHttps:useHttps];
 }
 
 - (instancetype)initWithKey:(NSString *)key

Source/OCGoogleDirectionsAPI/Client/RequestURLCreator/OCDirectionsRequestURLCreatorJSON.m

@@ -33,7 +33,6 @@ @implementation OCDirectionsRequestURLCreatorJSON
 - (NSString *)stringFromRequest:(OCDirectionsRequest *)request useHttps:(BOOL)useHttps andKey:(NSString *)key
 {
 	OCAssertParameterNotNil(request, @"Request is nil.");
-    OCAssertParameterNotNil(key, @"Key is nil.");
 
     NSMutableString *string = [self baseStringWithHttps:useHttps];
 
@@ -222,9 +221,9 @@ - (void)appendAlternatives:(OCDirectionsRequest *)request toString:(NSMutableStr
 - (void)appendKey:(NSString *)key toString:(NSMutableString *)string
 {
 	/**
-	 API key is not requred. Empty string when key is not provided.
+	 API key is not requred. 
 	 */
-	if (key.length) {
+	if (key) {
 		[string appendString:kOCGoogleDirectionsRequestAttributeKey];
 		[string appendString:key];
 	}

Source/OCGoogleDirectionsAPITests/Client/RequestURLCreator/OCDirectionsRequestURLCreatorJSONTests.m

@@ -62,8 +62,12 @@ - (void)testStringFromRequestWhenKeyIsNil
 	OCDirectionsRequest *request = [self prepareRequest];
 	NSString *key = nil;
 
+	// when
+	NSString *response = [self.urlCreator stringFromRequest:request useHttps:YES andKey:key];
+	
 	// then
-	XCTAssertThrowsSpecificNamed([self.urlCreator stringFromRequest:request useHttps:YES andKey:key], NSException, NSInvalidArgumentException);
+	XCTAssertNotNil(response);
+	XCTAssertEqualObjects(@"https://maps.googleapis.com/maps/api/directions/json?origin=London&destination=Lodz&sensor=false", response);
 }
 
 - (void)testStringFromRequestWhenRequestAndKeyAreNil
@@ -76,20 +80,6 @@ - (void)testStringFromRequestWhenRequestAndKeyAreNil
 	XCTAssertThrowsSpecificNamed([self.urlCreator stringFromRequest:request useHttps:YES andKey:key], NSException, NSInvalidArgumentException);
 }
 
-- (void)testStringFromRequestWhenKeyIsNotProvided
-{
-	// given
-	OCDirectionsRequest *request = [self prepareRequest];
-	NSString *key = @"";
-	
-	// when
-	NSString *response = [self.urlCreator stringFromRequest:request useHttps:YES andKey:key];
-	
-	// then
-	XCTAssertNotNil(response);
-	XCTAssertEqualObjects(@"https://maps.googleapis.com/maps/api/directions/json?origin=London&destination=Lodz&sensor=false", response);
-}
-
 #pragma mark - Test stringFromRequest:useHttps:andKey: when arguments are valid
 - (void)testStringFromRequestWhenAllArgumentsAreValid
 {