diff --git a/crates/oas3/src/spec/media_type_examples.rs b/crates/oas3/src/spec/media_type_examples.rs
index a44e34c..4657618 100644
--- a/crates/oas3/src/spec/media_type_examples.rs
+++ b/crates/oas3/src/spec/media_type_examples.rs
@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 use super::{Example, ObjectOrReference, Spec};
 
 /// Examples for a media type.
-#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 #[serde(untagged)]
 pub enum MediaTypeExamples {
     /// Example of the media type.
@@ -80,3 +80,133 @@ impl MediaTypeExamples {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use serde_json::json;
+
+    use super::*;
+
+    #[test]
+    fn is_empty() {
+        assert!(MediaTypeExamples::default().is_empty());
+
+        assert!(!MediaTypeExamples::Example {
+            example: serde_json::Value::Null
+        }
+        .is_empty());
+    }
+
+    #[test]
+    fn deserialize() {
+        assert_eq!(
+            serde_yml::from_str::<MediaTypeExamples>(indoc::indoc! {"
+                    examples: {}
+                "})
+            .unwrap(),
+            MediaTypeExamples::default(),
+        );
+
+        assert_eq!(
+            serde_yml::from_str::<MediaTypeExamples>(indoc::indoc! {"
+                    example: null
+                "})
+            .unwrap(),
+            MediaTypeExamples::Example {
+                example: json!(null)
+            },
+        );
+    }
+
+    #[test]
+    fn serialize() {
+        let mt_examples = MediaTypeExamples::default();
+        assert_eq!(
+            serde_yml::to_string(&mt_examples).unwrap(),
+            indoc::indoc! {"
+                examples: {}
+            "},
+        );
+
+        let mt_examples = MediaTypeExamples::Example {
+            example: json!(null),
+        };
+        assert_eq!(
+            serde_yml::to_string(&mt_examples).unwrap(),
+            indoc::indoc! {"
+                example: null
+            "},
+        );
+    }
+
+    #[test]
+    fn single_example() {
+        let spec = serde_yml::from_str::<Spec>(indoc::indoc! {"
+openapi: 3.1.0
+info:
+  title: Mascots
+  version: 0.0.0
+paths: {}
+        "})
+        .unwrap();
+
+        let mt_examples = MediaTypeExamples::Example {
+            example: json!("ferris"),
+        };
+
+        let examples = mt_examples.resolve_all(&spec);
+
+        // no example with this name defined
+        assert_eq!(examples.get("Go"), None);
+
+        // single examples are put in "default" key of returned map
+        assert_eq!(
+            examples.get("default").unwrap().value.as_ref().unwrap(),
+            &json!("ferris"),
+        );
+    }
+
+    #[test]
+    fn resolve_references() {
+        let spec = serde_yml::from_str::<Spec>(indoc::indoc! {"
+openapi: 3.1.0
+info:
+  title: Mascots
+  version: 0.0.0
+paths: {}
+components:
+    examples:
+        RustMascot:
+            value: ferris
+        "})
+        .unwrap();
+
+        let mt_examples = MediaTypeExamples::Examples {
+            examples: BTreeMap::from([
+                (
+                    "Rust".to_owned(),
+                    ObjectOrReference::Ref {
+                        ref_path: "#/components/examples/RustMascot".to_owned(),
+                    },
+                ),
+                (
+                    "Go".to_owned(),
+                    ObjectOrReference::Ref {
+                        ref_path: "#/components/examples/GoMascot".to_owned(),
+                    },
+                ),
+            ]),
+        };
+
+        let examples = mt_examples.resolve_all(&spec);
+
+        // reference points to non-existent component
+        assert_eq!(examples.get("Go"), None);
+
+        // reference points to valid example component
+        assert_eq!(
+            examples.get("Rust").unwrap().value.as_ref().unwrap(),
+            &json!("ferris"),
+        );
+    }
+}
diff --git a/crates/oas3/src/spec/tag.rs b/crates/oas3/src/spec/tag.rs
index 9ae548f..f260d50 100644
--- a/crates/oas3/src/spec/tag.rs
+++ b/crates/oas3/src/spec/tag.rs
@@ -20,6 +20,8 @@ pub struct Tag {
     /// [CommonMark syntax](http://spec.commonmark.org/) MAY be used for rich text representation.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
+
+    //
     // /// Additional external documentation for this tag.
     // #[serde(default)]
     // #[serde(skip_serializing_if = "Vec::is_empty")]