Add is_empty impl to EnvFileBuilder

test_util/src/env_file.rs

@@ -84,6 +84,11 @@ impl EnvFileBuilder {
         &self.contents
     }
 
+    /// Returns true when the contents of the builder is empty.
+    pub fn is_empty(&self) -> bool {
+        self.contents.is_empty()
+    }
+
     /// Add a slice of key-value pairs, separated by newlines.
     ///
     /// Includes a trailing newline.

test_util/src/tests/env_file_builder.rs

@@ -3,13 +3,13 @@ use super::*;
 #[test]
 fn new_builds_empty() {
     let efb = EnvFileBuilder::new();
-    assert_contents_empty(efb);
+    assert!(efb.is_empty());
 }
 
 #[test]
 fn default_builds_empty() {
     let efb = EnvFileBuilder::default();
-    assert_contents_empty(efb);
+    assert!(efb.is_empty());
 }
 
 #[test]
@@ -106,11 +106,6 @@ fn from_string() {
     assert_contents_str(efb, &create_default_env_file());
 }
 
-fn assert_contents_empty(efb: EnvFileBuilder) {
-    let contents = efb.into_owned_bytes();
-    assert!(contents.is_empty());
-}
-
 fn assert_contents_str(efb: EnvFileBuilder, expected: &str) {
     let contents = efb.into_owned_string();
     assert_eq!(expected, contents,);