add comments indicating filter expr

tests/delete-tests.rs

@@ -4,6 +4,7 @@ use hq_rs::{delete, parser::Field};
 
 #[test]
 fn delete_attr() -> Result<(), Box<dyn Error>> {
+    // filter '.version'
     let fields = vec![Field::new("version")];
 
     let mut body = utilities::edit_hcl("version = \"test\"")?;
@@ -17,6 +18,7 @@ fn delete_attr() -> Result<(), Box<dyn Error>> {
 
 #[test]
 fn delete_labeled_block() -> Result<(), Box<dyn Error>> {
+    // filter '.module{"cool-module"}'
     let fields = vec![Field::labeled("module", &["cool-module"])];
 
     let mut body = utilities::edit_hcl("module \"cool-module\" { version = \"1.0\" }")?;
@@ -29,6 +31,7 @@ fn delete_labeled_block() -> Result<(), Box<dyn Error>> {
 
 #[test]
 fn delete_labeled_block_attr() -> Result<(), Box<dyn Error>> {
+    // filter '.module{"cool-module"}.version'
     let fields = vec![
         Field::labeled("module", &["cool-module"]),
         Field::new("version"),
@@ -44,6 +47,7 @@ fn delete_labeled_block_attr() -> Result<(), Box<dyn Error>> {
 
 #[test]
 fn delete_block() -> Result<(), Box<dyn Error>> {
+    // filter '.local'
     let fields = vec![Field::new("local")];
 
     let mut body = utilities::edit_hcl("local { var = 5 }")?;
@@ -56,6 +60,7 @@ fn delete_block() -> Result<(), Box<dyn Error>> {
 
 #[test]
 fn delete_block_attr() -> Result<(), Box<dyn Error>> {
+    // filter '.local.var'
     let fields = vec![Field::new("local"), Field::new("var")];
 
     let mut body = utilities::edit_hcl("local { var = 5 }")?;
@@ -68,6 +73,7 @@ fn delete_block_attr() -> Result<(), Box<dyn Error>> {
 
 #[test]
 fn delete_from_object() -> Result<(), Box<dyn Error>> {
+    // filter '.local.obj.val'
     let fields = vec![Field::new("local"), Field::new("obj"), Field::new("val")];
 
     let mut body = utilities::edit_hcl("local { obj = { val = 5 } }")?;