added docs and tests

src/core/types/label_price.rs

@@ -1,5 +1,29 @@
-#[derive(Debug, Deserialize, Hash, PartialEq, Eq, Clone)]
+#[derive(Debug, Hash, PartialEq, Eq, Clone, Serialize)]
+/// This object represents a portion of the price for goods or services.
 pub struct LabeledPrice {
+    /// Portion label
     pub label: String,
+    /// Price of the product in the smallest units of the
+    /// [currency](https://core.telegram.org/bots/payments#supported-currencies)
+    /// (integer, not float/double). For example, for a price of US$ 1.45 pass
+    /// amount = 145. See the exp parameter in [`currencies.json`](https://core.telegram.org/bots/payments/currencies.json),
+    /// it shows the number of digits past the decimal point for each currency
+    /// (2 for the majority of currencies).
     pub amount: i64,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn serialize() {
+        let labeled_price = LabeledPrice {
+            label: "Label".to_string(),
+            amount: 60
+        };
+        let expected = r#"{"label":"Label","amount":60}"#;
+        let actual = serde_json::to_string(&labeled_price).unwrap();
+        assert_eq!(actual, expected);
+    }
+}

src/core/types/send_invoice.rs

@@ -1,6 +1,6 @@
 use crate::core::types::{InlineKeyboardMarkup, LabeledPrice};
 
-#[derive(Debug, Deserialize, Hash, PartialEq, Eq, Clone)]
+#[derive(Debug, Hash, PartialEq, Eq, Clone)]
 pub struct SendInvoice {
     pub chat_id: i64,
     pub title: String,

src/core/types/shipping_option.rs

@@ -1,8 +1,31 @@
 use crate::core::types::LabeledPrice;
 
-#[derive(Debug, Deserialize, Hash, PartialEq, Eq, Clone)]
+#[derive(Debug, Hash, PartialEq, Eq, Clone, Serialize)]
+/// This object represents one shipping option.
 pub struct ShippingOption {
-    pub id: i64,
+    /// Shipping option identifier
+    pub id: String,
+    /// Option title
     pub title: String,
+    /// List of price portions
     pub prices: Vec<LabeledPrice>,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn serialize() {
+        let shipping_option = ShippingOption {
+            id: "0".to_string(),
+            title: "Option".to_string(),
+            prices: vec![
+                LabeledPrice { label: "Label".to_string(), amount: 60 }
+            ]
+        };
+        let expected = r#"{"id":"0","title":"Option","prices":[{"label":"Label","amount":60}]}"#;
+        let actual = serde_json::to_string(&shipping_option).unwrap();
+        assert_eq!(actual, expected);
+    }
+}