test(cli): stabilize HTTP fixture response dates

moli/tests/fetch_cli/http_fail.rs

@@ -3,6 +3,7 @@ use axum::{
     Router,
     extract::Path,
     http::{HeaderValue, StatusCode, header},
+    middleware::map_response,
     response::{Html, IntoResponse, Redirect, Response},
     routing::get,
 };
@@ -25,6 +26,15 @@ const HTML: &str =
     "<!doctype html><title>HTTP fixture</title><h1>HTTP fixture</h1><p>response body</p>";
 const RAW_BODY: &[u8] = b"\0\xffraw HTTP error body";
 
+async fn fixture_response_date(mut response: Response) -> Response {
+    // Separate CLI invocations must receive identical headers for JSON comparisons.
+    response.headers_mut().insert(
+        header::DATE,
+        HeaderValue::from_static("Wed, 01 Jan 2020 00:00:00 GMT"),
+    );
+    response
+}
+
 struct HttpFailureFixture {
     base_url: String,
     task: JoinHandle<()>,
@@ -100,17 +110,7 @@ impl HttpFailureFixture {
                         .into_response()
                 }),
             )
-            .layer(axum::middleware::map_response(
-                |mut response: Response| async move {
-                    // Separate requests must have identical fixture headers when
-                    // the test compares their complete selected-format output.
-                    response.headers_mut().insert(
-                        header::DATE,
-                        HeaderValue::from_static("Thu, 01 Jan 1970 00:00:00 GMT"),
-                    );
-                    response
-                },
-            ));
+            .layer(map_response(fixture_response_date));
         let listener = TcpListener::bind("127.0.0.1:0").await?;
         let base_url = format!("http://{}", listener.local_addr()?);
         let task = tokio::spawn(async move {