I fix order of expected and actual from basicobject.rb to true.rb in folder '/test/t'.

I follow up for #1420

I fix :argument order:
* assert_true(expected, actual)
* assert_float(expected, actual) in float.rb and string.rb

When test *.rb file parse error, I  enclosed arguments  in parentheses.
For instance:
* assert_eqaul -3, a -> assert_eqaul(-3, a)
* assert_equal {}, h -> assert_equal({}, h)

Maybe, all fixes have done.