|  | @@ -37,10 +37,14 @@
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				|  |  |  #define TEST_TIMEOUT 16
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				|  |  | -static NSString *const kHostAddress = @"localhost:5050";
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				|  |  | +// The server address is derived from preprocessor macro, which is
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				|  |  | +// in turn derived from environment variable of the same name.
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				|  |  | +#define NSStringize_helper(x) #x
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				|  |  | +#define NSStringize(x) @NSStringize_helper(x)
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				|  |  | +static NSString *const kHostAddress = NSStringize(HOST_PORT_LOCAL);
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				|  |  |  static NSString *const kPackage = @"grpc.testing";
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				|  |  |  static NSString *const kService = @"TestService";
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				|  |  | -static NSString *const kRemoteSSLHost = @"grpc-test.sandbox.googleapis.com";
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				|  |  | +static NSString *const kRemoteSSLHost = NSStringize(HOST_PORT_REMOTE);
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				|  |  |  
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				|  |  |  static GRPCProtoMethod *kInexistentMethod;
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				|  |  |  static GRPCProtoMethod *kEmptyCallMethod;
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