test(net): add test to check that all expected requests are made

tests/net.rs

@@ -5,6 +5,7 @@ type TestResult = Result<(), Error>;
 
 #[tokio::test]
 async fn test_get() -> TestResult {
+    //given
     let mut net = kxio::net::mock();
     let client = net.client();
 
@@ -18,8 +19,10 @@ async fn test_get() -> TestResult {
 
     net.on(request).response(my_response.into());
 
+    //when
     let response = net.send(client.get(url)).await?;
 
+    //then
     assert_eq!(response.status(), http::StatusCode::OK);
     assert_eq!(response.bytes().await.expect("response body"), "Get OK");
 
@@ -28,6 +31,7 @@ async fn test_get() -> TestResult {
 
 #[tokio::test]
 async fn test_post() -> TestResult {
+    //given
     let mut net = kxio::net::mock();
     let client = net.client();
 
@@ -41,10 +45,38 @@ async fn test_post() -> TestResult {
 
     net.on(request).response(my_response.into());
 
+    //when
     let response = net.send(client.post(url)).await?;
 
+    //then
     assert_eq!(response.status(), http::StatusCode::OK);
     assert_eq!(response.bytes().await.expect("response body"), "Post OK");
 
     Ok(())
 }
+
+#[tokio::test]
+#[should_panic]
+async fn test_unused_post() {
+    //given
+    let mut net = kxio::net::mock();
+    let client = net.client();
+
+    let url = "https://www.example.com";
+    let request = client.post(url).build().expect("build request");
+    let my_response = net
+        .response()
+        .status(200)
+        .body("Post OK")
+        .expect("request body");
+
+    net.on(request).response(my_response.into());
+
+    //when
+    // don't send the planned request
+    // let _response = net.send(client.post(url)).await.expect("send");
+
+
+    //then
+    // Drop implementation for net should panic
+}