Convert the `Conversations` component into a freestanding struct.

Unlike the previous example, this involves cloning an event broadcaster, as well. This is, per the documentation, how the type may be used. From <https://docs.rs/tokio/latest/tokio/sync/broadcast/fn.channel.html>:

> The Sender can be cloned to send to the same channel from multiple points in the process or it can be used concurrently from an `Arc`.

The language is less firm than the language sqlx uses for its pool, but the intent is clear enough, and it works in practice.

1 files changed, 43 insertions, 23 deletions

diff --git a/src/conversation/handlers/create/test.rs b/src/conversation/handlers/create/test.rs
index bc05b00..380bb13 100644
--- a/src/conversation/handlers/create/test.rs
+++ b/src/conversation/handlers/create/test.rs
@@ -22,10 +22,14 @@ async fn new_conversation() {
 
     let name = fixtures::conversation::propose();
     let request = super::Request { name: name.clone() };
-    let super::Response(response) =
-        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
-            .await
-            .expect("creating a conversation in an empty app succeeds");
+    let super::Response(response) = super::handler(
+        State(app.conversations()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect("creating a conversation in an empty app succeeds");
 
     // Verify the structure of the response
 
@@ -77,10 +81,14 @@ async fn duplicate_name() {
     let request = super::Request {
         name: conversation.name.clone(),
     };
-    let super::Error(error) =
-        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
-            .await
-            .expect_err("duplicate conversation name should fail the request");
+    let super::Error(error) = super::handler(
+        State(app.conversations()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect_err("duplicate conversation name should fail the request");
 
     // Verify the structure of the response
 
@@ -110,10 +118,14 @@ async fn conflicting_canonical_name() {
     let request = super::Request {
         name: conflicting_name.clone(),
     };
-    let super::Error(error) =
-        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
-            .await
-            .expect_err("duplicate conversation name should fail the request");
+    let super::Error(error) = super::handler(
+        State(app.conversations()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect_err("duplicate conversation name should fail the request");
 
     // Verify the structure of the response
 
@@ -135,7 +147,7 @@ async fn invalid_name() {
     let name = fixtures::conversation::propose_invalid_name();
     let request = super::Request { name: name.clone() };
     let super::Error(error) = crate::conversation::handlers::create::handler(
-        State(app.clone()),
+        State(app.conversations()),
         creator,
         fixtures::now(),
         Json(request),
@@ -163,7 +175,7 @@ async fn name_reusable_after_delete() {
 
     let request = super::Request { name: name.clone() };
     let super::Response(response) = super::handler(
-        State(app.clone()),
+        State(app.conversations()),
         creator.clone(),
         fixtures::now(),
         Json(request),
@@ -181,10 +193,14 @@ async fn name_reusable_after_delete() {
     // Call the endpoint (second time)
 
     let request = super::Request { name: name.clone() };
-    let super::Response(response) =
-        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
-            .await
-            .expect("creation succeeds after original conversation deleted");
+    let super::Response(response) = super::handler(
+        State(app.conversations()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect("creation succeeds after original conversation deleted");
 
     // Verify the structure of the response
 
@@ -212,7 +228,7 @@ async fn name_reusable_after_expiry() {
 
     let request = super::Request { name: name.clone() };
     let super::Response(_) = super::handler(
-        State(app.clone()),
+        State(app.conversations()),
         creator.clone(),
         fixtures::ancient(),
         Json(request),
@@ -230,10 +246,14 @@ async fn name_reusable_after_expiry() {
     // Call the endpoint (second time)
 
     let request = super::Request { name: name.clone() };
-    let super::Response(response) =
-        super::handler(State(app.clone()), creator, fixtures::now(), Json(request))
-            .await
-            .expect("creation succeeds after original conversation expired");
+    let super::Response(response) = super::handler(
+        State(app.conversations()),
+        creator,
+        fixtures::now(),
+        Json(request),
+    )
+    .await
+    .expect("creation succeeds after original conversation expired");
 
     // Verify the structure of the response