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56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
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// 302-Gen-Table.cpp
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// Shows how to use table to run a test many times with different inputs. Lifted from examples on
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// issue #850.
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/generators/catch_generators.hpp>
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#include <string>
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struct TestSubject {
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// this is the method we are going to test. It returns the length of the
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// input string.
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size_t GetLength( const std::string& input ) const { return input.size(); }
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};
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TEST_CASE("Table allows pre-computed test inputs and outputs", "[example][generator]") {
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using std::make_tuple;
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// do setup here as normal
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TestSubject subj;
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SECTION("This section is run for each row in the table") {
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std::string test_input;
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size_t expected_output;
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std::tie( test_input, expected_output ) =
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GENERATE( table<std::string, size_t>(
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{ /* In this case one of the parameters to our test case is the
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* expected output, but this is not required. There could be
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* multiple expected values in the table, which can have any
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* (fixed) number of columns.
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*/
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make_tuple( "one", 3 ),
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make_tuple( "two", 3 ),
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make_tuple( "three", 5 ),
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make_tuple( "four", 4 ) } ) );
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// run the test
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auto result = subj.GetLength(test_input);
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// capture the input data to go with the outputs.
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CAPTURE(test_input);
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// check it matches the pre-calculated data
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REQUIRE(result == expected_output);
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} // end section
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}
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/* Possible simplifications where less legacy toolchain support is needed:
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*
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* - With libstdc++6 or newer, the make_tuple() calls can be ommitted
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* (technically C++17 but does not require -std in GCC/Clang). See
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* https://stackoverflow.com/questions/12436586/tuple-vector-and-initializer-list
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*
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* - In C++17 mode std::tie() and the preceeding variable delcarations can be
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* replaced by structured bindings: auto [test_input, expected] = GENERATE(
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* table<std::string, size_t>({ ...
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*/
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// Compiling and running this file will result in 4 successful assertions
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