Ensure empty sections are parsed but empty

Author: belak

src/ini.rs

@@ -761,6 +761,8 @@ impl Ini {
                 (Some(0), Some(end)) => {
                     section = caser(trimmed[1..end].trim());
 
+                    map.entry(section.clone()).or_default();
+
                     continue;
                 }
                 (Some(0), None) => {

tests/test.rs

@@ -231,6 +231,25 @@ fn cs() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+#[test]
+fn ensure_empty_sections_exist() -> Result<(), Box<dyn Error>> {
+    const FILE_CONTENTS: &str = "
+[basic_section]
+basic_option=basic_value
+[empty_section]
+";
+
+    let mut config = Ini::new();
+    config.read(FILE_CONTENTS.to_owned())?;
+
+    assert_eq!(
+        config.sections(),
+        vec![String::from("basic_section"), String::from("empty_section")]
+    );
+
+    Ok(())
+}
+
 #[test]
 #[cfg(feature = "indexmap")]
 fn sort_on_write() -> Result<(), Box<dyn Error>> {