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Initial attempt at a type-agnostic equality matcher.
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Adam Milligan
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Apr 22, 2011
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| #import "Equal.h" | |||
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| #import <Foundation/Foundation.h> | |||
| #import "CDRExampleBase.h" | |||
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| #include <iostream> | |||
| #include <sstream> | |||
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| namespace Cedar { namespace Matchers { | |||
| template<typename T> | |||
| class EqualMatcher { | |||
| private: | |||
| EqualMatcher<T> & operator=(const EqualMatcher<T> &); | |||
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| public: | |||
| EqualMatcher(const T & expectedValue); | |||
| ~EqualMatcher(); | |||
| // Allow default copy ctor. | |||
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| template<typename U> | |||
| bool matches(const U &) const; | |||
| bool matches(const id &) const; | |||
| bool matches(NSObject * const &) const; | |||
| bool matches(NSString * const &) const; | |||
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| NSString * failure_message() const; | |||
| NSString * negative_failure_message() const; | |||
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| private: | |||
| template<typename U> | |||
| NSString * stringFor(const U &) const; | |||
| NSString * stringFor(const id & value) const; | |||
| NSString * stringFor(NSObject * const &) const; | |||
| NSString * stringFor(NSString * const &) const; | |||
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| private: | |||
| const T & expectedValue_; | |||
| mutable NSString *actualValueString_; | |||
| }; | |||
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| template<typename T> | |||
| EqualMatcher<T> equal(const T & expectedValue) { | |||
| return EqualMatcher<T>(expectedValue); | |||
| } | |||
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| template<typename T> | |||
| EqualMatcher<T>::EqualMatcher(const T & expectedValue) | |||
| : expectedValue_(expectedValue), actualValueString_(nil) { | |||
| } | |||
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| template<typename T> | |||
| EqualMatcher<T>::~EqualMatcher() { | |||
| [actualValueString_ release]; actualValueString_ = nil; | |||
| } | |||
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| #pragma mark Generic | |||
| template<typename T> template<typename U> | |||
| bool EqualMatcher<T>::matches(const U & actualValue) const { | |||
| actualValueString_ = [this->stringFor(actualValue) retain]; | |||
| return expectedValue_ == actualValue; | |||
| } | |||
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| template<typename T> template<typename U> | |||
| NSString * EqualMatcher<T>::stringFor(const U & value) const { | |||
| std::stringstream temp; | |||
| temp << value; | |||
| return [NSString stringWithCString:temp.str().c_str() encoding:NSUTF8StringEncoding]; | |||
| } | |||
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| template<typename T> | |||
| NSString * EqualMatcher<T>::failure_message() const { | |||
| return [NSString stringWithFormat:@"Expected <%@> to equal <%@>", actualValueString_, this->stringFor(expectedValue_)]; | |||
| } | |||
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| template<typename T> | |||
| NSString * EqualMatcher<T>::negative_failure_message() const { | |||
| return [NSString stringWithFormat:@"Expected <%@> to not equal <%@>", actualValueString_, this->stringFor(expectedValue_)]; | |||
| } | |||
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| #pragma mark id | |||
| template<typename T> | |||
| bool EqualMatcher<T>::matches(const id & actualValue) const { | |||
| actualValueString_ = [[NSString alloc] initWithFormat:@"%@", actualValue]; | |||
| return [actualValue isEqual:expectedValue_]; | |||
| } | |||
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| template<> template<typename U> | |||
| bool EqualMatcher<id>::matches(const U & actualValue) const { | |||
| [[CDRSpecFailure specFailureWithReason:@"Attempt to compare id to incomparable type"] raise]; | |||
| } | |||
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| template<typename T> | |||
| NSString * EqualMatcher<T>::stringFor(const id & value) const { | |||
| return [NSString stringWithFormat:@"%@", value]; | |||
| } | |||
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| #pragma mark NSObject | |||
| template<typename T> | |||
| bool EqualMatcher<T>::matches(NSObject * const & actualValue) const { | |||
| return this->matches(static_cast<const id &>(actualValue)); | |||
| } | |||
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| template<> template<typename U> | |||
| bool EqualMatcher<NSObject *>::matches(const U & actualValue) const { | |||
| [[CDRSpecFailure specFailureWithReason:@"Attempt to compare NSObject * to incomparable type"] raise]; | |||
| } | |||
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| template<typename T> | |||
| NSString * EqualMatcher<T>::stringFor(NSObject * const & value) const { | |||
| return this->stringFor(static_cast<const id &>(value)); | |||
| } | |||
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| #pragma mark NSString | |||
| template<typename T> | |||
| bool EqualMatcher<T>::matches(NSString * const & actualValue) const { | |||
| return this->matches(static_cast<const id &>(actualValue)); | |||
| } | |||
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| template<> template<typename U> | |||
| bool EqualMatcher<NSString *>::matches(const U & actualValue) const { | |||
| [[CDRSpecFailure specFailureWithReason:@"Attempt to compare NSString * to incomparable type"] raise]; | |||
| } | |||
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| template<typename T> | |||
| NSString * EqualMatcher<T>::stringFor(NSString * const & value) const { | |||
| return this->stringFor(static_cast<const id &>(value)); | |||
| } | |||
| }} | |||
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