C++ Unit Testing in C++ Catch
Example
Catch is a header only library that allows you to use both TDD and BDD unit test style.
The following snippet is from the Catch documentation page at this link:
SCENARIO( "vectors can be sized and resized", "[vector]" ) {
GIVEN( "A vector with some items" ) {
std::vector v( 5 );
REQUIRE( v.size() == 5 );
REQUIRE( v.capacity() >= 5 );
WHEN( "the size is increased" ) {
v.resize( 10 );
THEN( "the size and capacity change" ) {
REQUIRE( v.size() == 10 );
REQUIRE( v.capacity() >= 10 );
}
}
WHEN( "the size is reduced" ) {
v.resize( 0 );
THEN( "the size changes but not capacity" ) {
REQUIRE( v.size() == 0 );
REQUIRE( v.capacity() >= 5 );
}
}
WHEN( "more capacity is reserved" ) {
v.reserve( 10 );
THEN( "the capacity changes but not the size" ) {
REQUIRE( v.size() == 5 );
REQUIRE( v.capacity() >= 10 );
}
}
WHEN( "less capacity is reserved" ) {
v.reserve( 0 );
THEN( "neither size nor capacity are changed" ) {
REQUIRE( v.size() == 5 );
REQUIRE( v.capacity() >= 5 );
}
}
}
}
Conveniently, these tests will be reported as follows when run:
Scenario: vectors can be sized and resized
Given: A vector with some items
When: more capacity is reserved
Then: the capacity changes but not the size
