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// Lol Engine — Unit test implementation |
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// |
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// Copyright © 2010—2020 Sam Hocevar <sam@hocevar.net> |
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// |
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// Lol Engine is free software. It comes without any warranty, to |
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// the extent permitted by applicable law. You can redistribute it |
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// and/or modify it under the terms of the Do What the Fuck You Want |
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// to Public License, Version 2, as published by the WTFPL Task Force. |
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// See http://www.wtfpl.net/ for more details. |
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// |
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#pragma once |
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// |
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// The Unit test framework |
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// ——————————————————————— |
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// |
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#include <iostream> // std::cout |
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#include <iomanip> // std::setprecision |
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#include <sstream> // std::stringstream |
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#include <string> // std::string |
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#include <cmath> // std::fabs |
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namespace lol |
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{ |
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/* |
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* This is the base class for all fixtures. It keeps track of all |
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* fixtures registered through the lolunit_declare_fixture macro and puts them |
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* in a linked list. |
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*/ |
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class FixtureBase |
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{ |
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friend class text_runner; |
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public: |
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virtual void setup(void) {}; |
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virtual void teardown(void) {}; |
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protected: |
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FixtureBase() : m_next(NULL), m_testcases(0), m_failcases(0) {} |
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virtual ~FixtureBase() {} |
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static void AddFixture(FixtureBase *fixture) |
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{ |
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/* Protect against several instances of the same Fixture subclass */ |
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if (fixture->MarkFixture()) |
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return; |
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FixtureListHelper(fixture); |
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} |
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static FixtureBase *FixtureList() { return FixtureListHelper(NULL); } |
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virtual void RunFixture() = 0; |
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virtual bool MarkFixture() = 0; |
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/* Prevent compiler complaints about unreachable code */ |
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static inline bool True() { return true; } |
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FixtureBase *m_next; |
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int m_testcases, m_failcases; |
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int m_asserts, m_failure; |
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char const *m_fixturename, *m_currentname; |
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std::stringstream m_errorlog, m_context; |
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private: |
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/* The FixtureBase class keeps track of all instanciated children |
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* fixtures through this method. */ |
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static FixtureBase *FixtureListHelper(FixtureBase *set) |
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{ |
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static FixtureBase *head = NULL, *tail = NULL; |
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if (set) |
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{ |
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if (!head) head = set; |
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if (tail) tail->m_next = set; |
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tail = set; |
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} |
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return head; |
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} |
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}; |
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/* |
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* This template specialises FixtureBase and provides registration of |
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* test cases in a linked list through the lolunit_declare_test macro. |
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*/ |
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template<class T> class Fixture : protected FixtureBase |
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{ |
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public: |
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typedef T FixtureClass; |
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struct TestCase |
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{ |
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void (FixtureClass::* m_fun)(); |
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char const *m_testname; |
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TestCase *m_next; |
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protected: |
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static inline std::string make_msg(std::string const str) |
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{ |
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return "- " + str + "\n"; |
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} |
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}; |
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Fixture() |
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{ |
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AddFixture(this); |
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} |
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/* Run all test cases in this fixture. */ |
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virtual void RunFixture() |
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{ |
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m_errorlog.str(""); |
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m_testcases = 0; |
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m_failcases = 0; |
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for (TestCase *c = TestCaseList(); c; c = c->m_next) |
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{ |
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m_testcases++; |
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m_asserts = 0; |
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m_failure = false; |
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m_currentname = c->m_testname; |
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m_context.str(""); |
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std::cout << '.'; |
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(static_cast<FixtureClass *>(this)->*c->m_fun)(); |
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if (m_failure) std::cout << 'F'; |
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} |
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} |
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/* Mark the current fixture type as already registered and return whether |
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* it was seen before. */ |
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virtual bool MarkFixture() |
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{ |
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static bool seen = false; |
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if (seen) |
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{ |
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SealFixture(); |
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return true; |
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} |
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seen = true; |
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return false; |
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} |
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/* Manage Fixture sealing. Once SealFixture() has been called, we |
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* will no longer accept TestCase registrations. */ |
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static void SealFixture() { SealFixtureHelper(true); } |
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static bool IsFixtureSealed() { return SealFixtureHelper(false); } |
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/* Each Fixture class specialisation keeps track of its instanciated |
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* test cases. */ |
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static void AddTestCase(TestCase *that, char const *name, |
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void (FixtureClass::*fun)()) |
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{ |
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if (IsFixtureSealed()) |
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return; |
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that->m_fun = fun; |
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that->m_testname = name; |
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that->m_next = NULL; |
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TestCaseListHelper(that); |
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} |
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static TestCase *TestCaseList() { return TestCaseListHelper(NULL); } |
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private: |
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static bool SealFixtureHelper(bool set) |
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{ |
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static bool sealed = false; |
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if (set) sealed = true; |
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return sealed; |
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} |
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static TestCase *TestCaseListHelper(TestCase *set) |
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{ |
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static TestCase *head = NULL, *tail = NULL; |
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if (set) |
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{ |
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if (!head) head = set; |
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if (tail) tail->m_next = set; |
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tail = set; |
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} |
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return head; |
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} |
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}; |
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/* |
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* This simple class runs all automatically registered tests and reports |
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* on error and success in the standard output. |
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*/ |
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class text_runner |
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{ |
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public: |
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bool Run() |
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{ |
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bool ret = true; |
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std::stringstream errors(""); |
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int failcases = 0, testcases = 0; |
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for (FixtureBase *f = FixtureBase::FixtureList(); f; f = f->m_next) |
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{ |
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f->setup(); |
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f->RunFixture(); |
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f->teardown(); |
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errors << f->m_errorlog.str(); |
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testcases += f->m_testcases; |
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failcases += f->m_failcases; |
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} |
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std::cout << "\n"; |
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std::stringstream summary; |
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summary << "\n\n"; |
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if (failcases) |
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{ |
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summary << "!!!FAILURES!!!\n"; |
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summary << "Test Results:\n"; |
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summary << "Run: " << testcases |
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<< " Failures: " << failcases |
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<< " Errors: 0\n"; /* TODO: handle errors */ |
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summary << errors.str(); |
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ret = false; |
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} |
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else |
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{ |
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summary << "OK (" << testcases << " tests)\n"; |
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} |
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summary << "\n\n"; |
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std::cout << summary.str(); |
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return ret; |
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} |
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}; |
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#define lolunit_assert_generic(msg, cond) \ |
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do { \ |
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m_asserts++; \ |
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if (True() && !(cond)) \ |
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{ \ |
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m_errorlog << "\n\n"; \ |
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m_errorlog << ++m_failcases << ") test: " \ |
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<< lol_unit_helper_name(this) << "::" << m_currentname \ |
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<< " (F) line: " << __LINE__ << " " \ |
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<< __FILE__ << "\n"; \ |
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m_errorlog << "assertion failed\n"; \ |
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m_errorlog << "- Expression: " << #cond << "\n"; \ |
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m_errorlog << msg; \ |
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m_failure = true; \ |
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return; \ |
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} \ |
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} while (!True()) |
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#define lolunit_assert_op(op, modifier, opdesc, msg, a, b) \ |
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do { \ |
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m_asserts++; \ |
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if (True() && !modifier((a) op (b))) \ |
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{ \ |
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m_errorlog << "\n\n"; \ |
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m_errorlog << ++m_failcases << ") test: " \ |
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<< lol_unit_helper_name(this) << "::" << m_currentname \ |
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<< " (F) line: " << __LINE__ << " " \ |
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<< __FILE__ << "\n"; \ |
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m_errorlog << opdesc << " assertion failed\n"; \ |
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m_errorlog << "- Expected: " << #a << " = " << (a) << "\n"; \ |
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m_errorlog << "- Actual : " << #b << " = " << (b) << "\n"; \ |
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m_errorlog << msg; \ |
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m_errorlog << m_context.str(); \ |
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m_failure = true; \ |
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return; \ |
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} \ |
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} while (!True()) |
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#define lolunit_assert_doubles_equal_generic(msg, a, b, t) \ |
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do { \ |
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m_asserts++; \ |
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using std::fabs; \ |
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if (True() && fabs(double(a) - double(b)) > fabs(double(t))) \ |
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{ \ |
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m_errorlog << "\n\n"; \ |
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m_errorlog << ++m_failcases << ") test: " \ |
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<< lol_unit_helper_name(this) << "::" << m_currentname \ |
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<< " (F) line: " << __LINE__ << " " \ |
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<< __FILE__ << "\n"; \ |
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m_errorlog << "double equality assertion failed\n"; \ |
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std::streamsize old_prec = m_errorlog.precision(); \ |
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m_errorlog << std::setprecision(16); \ |
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m_errorlog << "- Expected: " << #a << " = " << (a) << "\n"; \ |
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m_errorlog << "- Actual : " << #b << " = " << (b) << "\n"; \ |
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m_errorlog << "- Delta : " << (t) << "\n"; \ |
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m_errorlog << std::setprecision(old_prec); \ |
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m_errorlog << msg; \ |
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m_errorlog << m_context.str(); \ |
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m_failure = true; \ |
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return; \ |
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} \ |
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} while (!True()) |
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/* |
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* Public helper macros |
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*/ |
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#define lolunit_declare_fixture(N) \ |
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class N; \ |
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/* This pattern allows us to statically create a Fixture instance \ |
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* before its exact implementation was defined. */ \ |
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template<typename T> struct lol_unit_helper_fixture_##N \ |
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{ \ |
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lol_unit_helper_fixture_##N() { p = new T(); } \ |
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~lol_unit_helper_fixture_##N() { delete p; } \ |
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T *p; \ |
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}; \ |
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lol_unit_helper_fixture_##N<N> lol_unit_helper_fixture_##N##_instance; \ |
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/* Allow to retrieve the class name without using RTTI and without \ |
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* knowing the type of "this". */ \ |
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static inline char const *lol_unit_helper_name(N *p) \ |
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{ \ |
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(void)p; \ |
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return #N; \ |
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} \ |
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/* Now the user can define the implementation */ \ |
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class N : public lol::Fixture<N> |
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#define lolunit_declare_test(N) \ |
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/* For each test in the fixture, we create an object that will \ |
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* automatically register the test method in a list global to the \ |
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* specialised fixture. */ \ |
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class lol_unit_helper_test_##N : public TestCase \ |
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{ \ |
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public: \ |
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lol_unit_helper_test_##N() \ |
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{ \ |
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(void)lol_unit_helper_name(nullptr); \ |
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AddTestCase(this, #N, \ |
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(void (FixtureClass::*)()) &FixtureClass::N); \ |
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} \ |
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}; \ |
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lol_unit_helper_test_##N lol_unit_helper_test_instance_##N; \ |
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void N() |
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/* |
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* Provide context for error messages |
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*/ |
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#define lolunit_set_context(n) \ |
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do { \ |
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m_context.str(""); \ |
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m_context << "- Context : " << #n << " = " << (n) << "\n"; \ |
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} while (!True()) |
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#define lolunit_unset_context(n) \ |
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m_context.str("") |
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/* |
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* Public assert macros |
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*/ |
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#define lolunit_fail(msg) \ |
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do { \ |
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m_asserts++; \ |
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m_errorlog << "\n\n"; \ |
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m_errorlog << ++m_failcases << ") test: " \ |
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<< lol_unit_helper_name(this) << "::" << m_currentname \ |
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<< " (F) line: " << __LINE__ << " " \ |
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<< __FILE__ << "\n"; \ |
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m_errorlog << "forced failure\n"; \ |
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m_errorlog << make_msg(msg); \ |
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m_errorlog << m_context.str(); \ |
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m_failure = true; \ |
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return; \ |
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} while (!True()) |
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#define lolunit_assert(cond) \ |
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lolunit_assert_generic("", cond) |
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#define lolunit_assert_message(m, cond) \ |
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lolunit_assert_generic(make_msg(m), cond) |
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#define lolunit_assert_equal(a, b) \ |
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lolunit_assert_op(==, (bool), "equality", "", a, b) |
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#define lolunit_assert_equal_message(m, a, b) \ |
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lolunit_assert_op(==, (bool), "equality", make_msg(m), a, b) |
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#define lolunit_assert_different(a, b) \ |
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lolunit_assert_op(!=, (bool), "inequality", "", a, b) |
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#define lolunit_assert_different_message(m, a, b) \ |
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lolunit_assert_op(!=, (bool), "inequality", make_msg(m), a, b) |
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#define lolunit_assert_less(a, b) \ |
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lolunit_assert_op(<, (bool), "less than", "", a, b) |
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#define lolunit_assert_less_message(m, a, b) \ |
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lolunit_assert_op(<, (bool), "less than", make_msg(m), a, b) |
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#define lolunit_assert_lequal(a, b) \ |
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lolunit_assert_op(<=, (bool), "less than or equal", "", a, b) |
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#define lolunit_assert_lequal_message(m, a, b) \ |
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lolunit_assert_op(<=, (bool), "less than or equal", make_msg(m), a, b) |
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#define lolunit_assert_greater(a, b) \ |
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lolunit_assert_op(>, (bool), "greater than", "", a, b) |
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#define lolunit_assert_greater_message(m, a, b) \ |
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lolunit_assert_op(>, (bool), "greater than", make_msg(m), a, b) |
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#define lolunit_assert_gequal(a, b) \ |
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lolunit_assert_op(>=, (bool), "greater than or equal", "", a, b) |
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#define lolunit_assert_gequal_message(m, a, b) \ |
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lolunit_assert_op(>=, (bool), "greater than or equal", make_msg(m), a, b) |
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#define lolunit_refute_equal(a, b) \ |
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lolunit_assert_op(==, !, "not equality", "", a, b) |
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#define lolunit_refute_equal_message(m, a, b) \ |
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lolunit_assert_op(==, !, "not equality", make_msg(m), a, b) |
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#define lolunit_refute_different(a, b) \ |
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lolunit_assert_op(!=, !, "not inequality", "", a, b) |
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#define lolunit_refute_different_message(m, a, b) \ |
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lolunit_assert_op(!=, !, "not inequality", make_msg(m), a, b) |
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#define lolunit_refute_less(a, b) \ |
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lolunit_assert_op(<, !, "not less than", "", a, b) |
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#define lolunit_refute_less_message(m, a, b) \ |
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lolunit_assert_op(<, !, "not less than", make_msg(m), a, b) |
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#define lolunit_refute_lequal(a, b) \ |
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lolunit_assert_op(<=, !, "not less than or equal", "", a, b) |
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#define lolunit_refute_lequal_message(m, a, b) \ |
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lolunit_assert_op(<=, !, "not less than or equal", make_msg(m), a, b) |
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#define lolunit_refute_greater(a, b) \ |
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lolunit_assert_op(>, !, "not greater than", "", a, b) |
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#define lolunit_refute_greater_message(m, a, b) \ |
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lolunit_assert_op(>, !, "not greater than", make_msg(m), a, b) |
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#define lolunit_refute_gequal(a, b) \ |
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lolunit_assert_op(>=, !, "not greater than or equal", "", a, b) |
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#define lolunit_refute_gequal_message(m, a, b) \ |
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lolunit_assert_op(>=, !, "not greater than or equal", make_msg(m), a, b) |
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#define lolunit_assert_doubles_equal(a, b, t) \ |
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lolunit_assert_doubles_equal_generic("", a, b, t) |
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#define lolunit_assert_doubles_equal_message(msg, a, b, t) \ |
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lolunit_assert_doubles_equal_generic(make_msg(msg), a, b, t) |
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} // namespace lol |
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