Catch

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
```

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