test: Assert log warnings and errors (#8457)

Adds `assert_warn`, `assert_error` and `assert_warns_or_errors`
methods to `TestContext`, that let us assert that
a certain warning or error is logged during the test.
Also asserts test logs should not contain any other
errors or warnings.

Adjusts tests accordingly.

Signed-off-by: Jagoda Ślązak <jslazak@jslazak.com>

src/contact/contact_tests.rs

@@ -176,7 +176,7 @@ async fn test_search_contacts_from_group() -> Result<()> {
     let bob = &tcm.bob().await;
     let fiona = &tcm.fiona().await;
 
-    let alice_chat_id = chat::create_group(alice, "").await?;
+    let alice_chat_id = chat::create_group(alice, "group").await?;
     let qr = get_securejoin_qr(alice, Some(alice_chat_id)).await?;
     let bob_chat_id = tcm.exec_securejoin_qr(bob, alice, &qr).await;
     tcm.exec_securejoin_qr(fiona, alice, &qr).await;
@@ -238,6 +238,7 @@ async fn test_add_or_lookup() {
         "\nWonderland, Alice <alice@w.de>\n",
     );
     assert_eq!(Contact::add_address_book(&t, book).await.unwrap(), 4);
+    t.assert_warn(r#"invalid address "+1234567890""#).await;
 
     // check first added contact, this modifies authname because it is empty
     let (contact_id, sth_modified) = Contact::add_or_lookup(
@@ -1095,6 +1096,11 @@ async fn test_was_seen_recently_event() -> Result<()> {
             .get_matching(|evt| matches!(evt, EventType::ContactsChanged { .. }))
             .await;
     }
+    // this warning is only printed when `RecentlySeenLoop` is dropped,
+    // so we can't assert it otherwise.
+    drop(recently_seen_loop);
+    bob.assert_warn("receiving from an empty and closed channel")
+        .await;
     Ok(())
 }