since the trim functions behave now differently in case of undefined argument (they return now empty string instead of undefined value) they also have be tested for that

Author: verhas

src/test/resources/com/scriptbasic/testprograms/TestStringFunctions.bas

@@ -10,9 +10,9 @@ assert("trim", trim(v)="1234")
 assert("rtrim", rtrim(v)=" 1234")
 
 ' Test null values
-assert("ltrim_with_null", IsNull(ltrim(undefined_var)))
-assert("trim_with_null", IsNull(trim(undefined_var)))
-assert("rtrim_with_null", IsNull(rtrim(undefined_var)))
+assert("ltrim_with_null", "" = ltrim(undefined_var))
+assert("trim_with_null", "" = trim(undefined_var))
+assert("rtrim_with_null", "" = rtrim(undefined_var))
 
 ' Test left, mid, right functions
 v = 1234