add write tests

tests/write-tests.rs

@@ -0,0 +1,60 @@
+use std::error::Error;
+
+use hq_rs::{parser::Field, write};
+
+#[test]
+fn attr() -> Result<(), Box<dyn Error>> {
+    // filter '.version'
+    let fields = vec![Field::new("version")];
+    // hcl:
+    // version = "test"
+    let mut body = utilities::edit_hcl("version = \"test\"")?;
+
+    let value: hcl_edit::expr::Expression = "\"new_value\"".parse()?;
+
+    write(fields, &mut body, &value)?;
+
+    assert_eq!("version = \"new_value\"", body.to_string());
+
+    Ok(())
+}
+
+#[test]
+fn block_attr() -> Result<(), Box<dyn Error>> {
+    // filter '.options.enabled'
+    let fields = vec![Field::new("options"), Field::new("enabled")];
+    // hcl:
+    // options { enabled = false }
+    let mut body = utilities::edit_hcl("options { enabled = false }")?;
+
+    let value: hcl_edit::expr::Expression = "true".parse()?;
+
+    write(fields, &mut body, &value)?;
+
+    assert_eq!("options { enabled = true }", body.to_string());
+
+    Ok(())
+}
+
+#[test]
+fn labeled_block_attr() -> Result<(), Box<dyn Error>> {
+    // filter '.module[label="cool-module"].version'
+    let fields = vec![
+        Field::labeled("module", &["cool-module"]),
+        Field::new("version"),
+    ];
+    // hcl:
+    // module "cool-module" { version = "1.0" }
+    let mut body = utilities::edit_hcl("module \"cool-module\" { version = \"1.0\" }")?;
+
+    let value: hcl_edit::expr::Expression = "\"2.0\"".parse()?;
+
+    write(fields, &mut body, &value)?;
+
+    assert_eq!(
+        "module \"cool-module\" { version = \"2.0\" }",
+        body.to_string()
+    );
+
+    Ok(())
+}

utilities/Cargo.toml

@@ -6,3 +6,4 @@ pulish = false
 
 [dependencies]
 hcl-rs = "0.17"
+hcl-edit = "0.8"

utilities/src/lib.rs

@@ -5,3 +5,8 @@ pub fn read_test_hcl() -> Result<hcl::Body, Box<dyn Error>> {
     let body: hcl::Body = hcl::from_str(&contents)?;
     Ok(body)
 }
+
+pub fn edit_hcl(contents: &str) -> Result<hcl_edit::structure::Body, Box<dyn Error>> {
+    let body: hcl_edit::structure::Body = contents.parse()?;
+    Ok(body)
+}