add expense_item interface unit tests

Author: mschuchard

src/interface/expense_item.rs

@@ -23,7 +23,7 @@ pub async fn expense_item(
 /// Retrieves all Ruddr Expense Item objects, and deserializes it to the corresponding vector of model structs.
 /// https://ruddr.readme.io/reference/list-expense-items
 /// ```ignore
-/// let expense_reports = expense_reports(&client).await?;
+/// let expense_items = expense_items(&client, Some(types::UUID::from("2bdab00d-86fb-46dc-ae05-7cc9c4aedc80"))).await?;
 /// ```
 pub async fn expense_items(
     client: &client::Client,
@@ -42,3 +42,6 @@ pub async fn expense_items(
         .read::<expense_item::ExpenseItems>("expense-items", &params)
         .await?)
 }
+
+#[cfg(test)]
+mod tests;

src/interface/expense_item/tests.rs

@@ -0,0 +1,43 @@
+use super::*;
+
+#[test]
+fn test_expense_item() {
+    let test = async {
+        let client = client::Client::new(Some("abcdefghi123456789"))
+            .expect("client with token could not be constructed");
+        assert_eq!(
+            expense_item(
+                &client,
+                types::UUID::from("77f5ccdc-4226-4ff1-877e-5644d0a04522")
+            )
+            .await
+            .unwrap_err()
+            .to_string(),
+            "client read response failed",
+            "expense_item retrieval did not fail on auth",
+        )
+    };
+    let rt = tokio::runtime::Runtime::new().unwrap();
+    rt.block_on(test);
+}
+
+#[test]
+fn test_expense_items() {
+    let test = async {
+        let client = client::Client::new(Some("abcdefghi123456789"))
+            .expect("client with token could not be constructed");
+        assert_eq!(
+            expense_items(
+                &client,
+                Some(types::UUID::from("2bdab00d-86fb-46dc-ae05-7cc9c4aedc80"))
+            )
+            .await
+            .unwrap_err()
+            .to_string(),
+            "client read response failed",
+            "expense_items retrieval did not fail on auth",
+        )
+    };
+    let rt = tokio::runtime::Runtime::new().unwrap();
+    rt.block_on(test);
+}