Unary matchers

open l_cursor for select * from dual where 1 = 0;

ut.expect( l_cursor ).to_( be_empty() );

  ut.expect( ( 1 = 0 ) ).to_( be_false() );

  ut.expect( to_clob('ABC') ).to_( be_not_null() );

  ut.expect( 1 ).to_( be_null() );

  ut.expect( ( 1 = 1 ) ).to_( be_true() );