a2 a

a3 a

a4 a5 a

b is null

a

b is null

a

b is null

a

b is null

a

b is null

a is not null

b is null and c is 5

a is not null

b is null and c is 5 and d is 'txt'

a is not null

b is null and c is 5 and d is 'txt'

b is null and c is not 5, but d is 'txt'

If we get to here it looks good with the tests

a is not null

b is null and c is 5 and d is 'txt'

b is null and c is not 5, but d is 'txt'

If we get to here it looks good with the tests

ttrue = true tfalse = false The following HTML tags schould be ignored by Embperl