catch2/tests/SelfTest/UsageTests/BDD.tests.cpp

/*
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */

#include <catch2/catch_test_macros.hpp>

namespace { namespace BDDTests {

#ifndef BDD_TEST_HELPERS_INCLUDED // Don't compile this more than once per TU
#define BDD_TEST_HELPERS_INCLUDED

    inline bool itDoesThis() { return true; }

    inline bool itDoesThat() { return true; }

    namespace {

// a trivial fixture example to support SCENARIO_METHOD tests
        struct Fixture {
            Fixture()
                    : d_counter(0) {
            }

            int counter() {
                return d_counter++;
            }

            int d_counter;
        };

    }
#endif

    SCENARIO("Do that thing with the thing", "[Tags]") {
        GIVEN("This stuff exists") {
            // make stuff exist
            AND_GIVEN("And some assumption") {
                // Validate assumption
                WHEN("I do this") {
                    // do this
                    THEN("it should do this") {
                        REQUIRE(itDoesThis());
                        AND_THEN("do that")REQUIRE(itDoesThat());
                    }
                }
            }
        }
    }

    SCENARIO("Vector resizing affects size and capacity", "[vector][bdd][size][capacity]") {
        GIVEN("an empty vector") {
            std::vector<int> v;
            REQUIRE(v.size() == 0);

            WHEN("it is made larger") {
                v.resize(10);
                THEN("the size and capacity go up") {
                    REQUIRE(v.size() == 10);
                    REQUIRE(v.capacity() >= 10);

                    AND_WHEN("it is made smaller again") {
                        v.resize(5);
                        THEN("the size goes down but the capacity stays the same") {
                            REQUIRE(v.size() == 5);
                            REQUIRE(v.capacity() >= 10);
                        }
                    }
                }
            }

            WHEN("we reserve more space") {
                v.reserve(10);
                THEN("The capacity is increased but the size remains the same") {
                    REQUIRE(v.capacity() >= 10);
                    REQUIRE(v.size() == 0);
                }
            }
        }
    }

    SCENARIO("This is a really long scenario name to see how the list command deals with wrapping",
             "[very long tags][lots][long][tags][verbose]"
                     "[one very long tag name that should cause line wrapping writing out using the list command]"
                     "[anotherReallyLongTagNameButThisOneHasNoObviousWrapPointsSoShouldSplitWithinAWordUsingADashCharacter]") {
        GIVEN("A section name that is so long that it cannot fit in a single console width")WHEN(
                    "The test headers are printed as part of the normal running of the scenario")THEN(
                        "The, deliberately very long and overly verbose (you see what I did there?) section names must wrap, along with an indent")SUCCEED(
                            "boo!");
    }

    SCENARIO_METHOD(Fixture,
                    "BDD tests requiring Fixtures to provide commonly-accessed data or methods",
                    "[bdd][fixtures]") {
        const int before(counter());
        GIVEN("No operations precede me") {
            REQUIRE(before == 0);
            WHEN("We get the count") {
                const int after(counter());
                THEN("Subsequently values are higher") {
                    REQUIRE(after > before);
                }
            }
        }
    }

}} // namespace BDDtests