chore: Migrate to the new testing style for structure rules

crates/lib/src/rules/structure/ST01.rs

@@ -85,92 +85,3 @@ FROM foo
         SegmentSeekerCrawler::new(const { SyntaxSet::new(&[SyntaxKind::CaseExpression]) }).into()
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use pretty_assertions::assert_eq;
-
-    use crate::api::simple::fix;
-    use crate::core::rules::base::{Erased, ErasedRule};
-    use crate::rules::structure::ST01::RuleST01;
-
-    fn rules() -> Vec<ErasedRule> {
-        vec![RuleST01.erased()]
-    }
-
-    #[test]
-    fn redundant_else_null() {
-        let fail_str = "
-    select
-        case name
-            when 'cat' then 'meow'
-            when 'dog' then 'woof'
-            else null
-        end
-    from x";
-
-        let fix_str = "
-    select
-        case name
-            when 'cat' then 'meow'
-            when 'dog' then 'woof'
-        end
-    from x";
-
-        let fixed = fix(fail_str, rules());
-        assert_eq!(fix_str, fixed);
-    }
-
-    #[test]
-    fn alternate_case_when_syntax() {
-        let fail_str = "
-    select
-        case name
-            when 'cat' then 'meow'
-            when 'dog' then 'woof'
-            else null
-        end
-    from x";
-
-        let fix_str = "
-    select
-        case name
-            when 'cat' then 'meow'
-            when 'dog' then 'woof'
-        end
-    from x";
-
-        let fixed = fix(fail_str, rules());
-        assert_eq!(fix_str, fixed);
-    }
-
-    #[test]
-    fn alternate_case_when_syntax_boolean() {
-        let pass_str = "
-    select
-        case name
-            when 'cat' then true
-            when 'dog' then true
-            else name is null
-        end
-    from x";
-
-        let fixed = fix(pass_str, rules());
-        assert_eq!(pass_str, fixed);
-    }
-
-    #[test]
-    fn else_expression() {
-        let pass_str = "
-    select
-        case name
-            when 'cat' then 'meow'
-            when 'dog' then 'woof'
-            else iff(wing_type is not null, 'tweet', 'invalid')
-        end
-    from x";
-
-        let fixed = fix(pass_str, rules());
-        assert_eq!(pass_str, fixed);
-    }
-}