feat(gpodder_sqlite): set up testing

gpodder_sqlite/src/lib.rs

@@ -94,3 +94,16 @@ pub fn initialize_db(path: impl AsRef<Path>, run_migrations: bool) -> Result<DbP
 
     Ok(pool)
 }
+
+pub fn initialize_db_in_memory(run_migrations: bool) -> Result<DbPool, DbError> {
+    let manager = ConnectionManager::<SqliteConnection>::new(":memory:");
+    let pool = Pool::builder()
+        .connection_customizer(Box::new(AddQueryDebugLogs))
+        .build(manager)?;
+
+    if run_migrations {
+        pool.get()?.run_pending_migrations(MIGRATIONS).unwrap();
+    }
+
+    Ok(pool)
+}

gpodder_sqlite/src/repository/mod.rs

@@ -24,4 +24,10 @@ impl SqliteRepository {
 
         Ok(Self { pool })
     }
+
+    pub fn in_memory() -> Result<Self, gpodder::AuthErr> {
+        let pool = super::initialize_db_in_memory(true)?;
+
+        Ok(Self { pool })
+    }
 }