code: function( name, handle ) {
  		if ( munit.isObject( name ) ) {
  			return munit.each( name, function( fn, method ) {
  				munit.custom( method, fn );
  			});
  		}
  
  		// Ensure that name can be used
  		if ( munit.customReserved.indexOf( name ) > -1 ) {
  			throw new Error( "'" + name + "' is a reserved name and cannot be added as a custom assertion test" );
  		}
  
  		// Send off to assertion module for attachment
  		munit.Assert.prototype[ name ] = handle;
  		munit.each( munit.ns, function( mod ) {
  			mod.custom( name, handle );
  		});
  	}
docs: Adding custom test comparisons