66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
// (C) Copyright 2015 Boost.Test team.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//[example_code
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#define BOOST_TEST_MODULE example
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#include <boost/test/included/unit_test.hpp>
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#include <stdexcept>
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#include <fstream>
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//! Computes the histogram of the words in a text file
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class FileWordHistogram
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{
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public:
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//!@throw std::exception if the file does not exist
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FileWordHistogram(std::string filename) : is_processed(false), fileStream_(filename) {
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if(!fileStream_.is_open()) throw std::runtime_error("Cannot open the file");
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}
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//! @returns true on success, false otherwise
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bool process() {
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if(is_processed) return true;
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// ...
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is_processed = true;
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return true;
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}
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//!@pre process has been called with status success
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//!@throw std::logic_error if preconditions not met
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std::map<std::string, std::size_t>
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result() const {
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if(!is_processed)
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throw std::runtime_error("\"process\" has not been called or was not successful");
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return histogram;
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}
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private:
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bool is_processed;
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std::ifstream fileStream_;
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std::map<std::string, std::size_t> histogram;
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};
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BOOST_AUTO_TEST_CASE( test_throw_behaviour )
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{
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// __FILE__ is accessible, no exception expected
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BOOST_REQUIRE_NO_THROW( FileWordHistogram(__FILE__) );
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// ".. __FILE__" does not exist, API says std::exception, and implementation
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// raises std::runtime_error child of std::exception
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BOOST_CHECK_THROW( FileWordHistogram(".." __FILE__), std::exception );
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{
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FileWordHistogram instance(__FILE__);
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// api says "std::logic_error", implementation is wrong.
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// std::runtime_error not a child of std::logic_error, not intercepted
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// here.
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BOOST_CHECK_THROW(instance.result(), std::logic_error);
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}
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}
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//]
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