diff --git a/src/bin/cli/context.rs b/src/bin/cli/context.rs
index 5b208c1..66f66cd 100644
--- a/src/bin/cli/context.rs
+++ b/src/bin/cli/context.rs
@@ -77,7 +77,10 @@ impl MessageContext for CliContext {
 		NonZeroU64::new(666).unwrap()
 	}
 
-	async fn download(&self, attachment: &Self::Attachment) -> Result<Vec<u8>, Error> {
+	async fn download(
+		_mutex: &tokio::sync::Mutex<&mut Self>,
+		attachment: &Self::Attachment,
+	) -> Result<Vec<u8>, Error> {
 		let res = tokio::fs::read(attachment).await?;
 		Ok(res)
 	}
diff --git a/src/commands/discord.rs b/src/commands/discord.rs
index 05336d3..505e7a7 100644
--- a/src/commands/discord.rs
+++ b/src/commands/discord.rs
@@ -5,6 +5,7 @@ use std::str::FromStr;
 use poise::serenity_prelude::futures::future::join_all;
 use poise::serenity_prelude::{CreateAttachment, CreateEmbed};
 use poise::CreateReply;
+use tokio::sync::Mutex;
 
 use crate::arcaea::play::Play;
 use crate::context::{Error, ErrorKind, TaggedError, UserContext};
@@ -33,18 +34,24 @@ pub trait MessageContext {
 	fn filename(attachment: &Self::Attachment) -> &str;
 	fn attachment_id(attachment: &Self::Attachment) -> NonZeroU64;
 
-	/// Downloads a single file
-	async fn download(&self, attachment: &Self::Attachment) -> Result<Vec<u8>, Error>;
+	/// Downloads a single file.
+	///
+	/// This takes a mutex, as downloads are often done in parallel.
+	async fn download(
+		mutex: &tokio::sync::Mutex<&mut Self>,
+		attachment: &Self::Attachment,
+	) -> Result<Vec<u8>, Error>;
 
 	/// Downloads every image
 	async fn download_images<'a>(
-		&self,
+		&mut self,
 		attachments: &'a [Self::Attachment],
 	) -> Result<Vec<(&'a Self::Attachment, Vec<u8>)>, Error> {
+		let mutex = &Mutex::new(self);
 		let download_tasks = attachments
 			.iter()
 			.filter(|file| Self::is_image(file))
-			.map(|file| async move { (file, self.download(file).await) });
+			.map(|file| async move { (file, Self::download(mutex, file).await) });
 
 		let downloaded = timed!("dowload_files", { join_all(download_tasks).await });
 		downloaded
@@ -111,7 +118,10 @@ impl<'a> MessageContext for poise::Context<'a, UserContext, Error> {
 		attachment.dimensions().is_some()
 	}
 
-	async fn download(&self, attachment: &Self::Attachment) -> Result<Vec<u8>, Error> {
+	async fn download(
+		_mutex: &tokio::sync::Mutex<&mut Self>,
+		attachment: &Self::Attachment,
+	) -> Result<Vec<u8>, Error> {
 		let res = poise::serenity_prelude::Attachment::download(attachment).await?;
 		Ok(res)
 	}
@@ -120,9 +130,12 @@ impl<'a> MessageContext for poise::Context<'a, UserContext, Error> {
 // }}}
 // {{{ Testing context
 pub mod mock {
-	use std::{env, fs, path::PathBuf};
+	use std::{
+		env, fs,
+		path::{Path, PathBuf},
+	};
 
-	use anyhow::Context;
+	use anyhow::{anyhow, Context};
 	use poise::serenity_prelude::CreateEmbed;
 	use serde::{Deserialize, Serialize};
 	use sha2::{Digest, Sha256};
@@ -139,6 +152,23 @@ pub mod mock {
 		hash: String,
 	}
 
+	impl AttachmentEssence {
+		pub fn new(filename: String, description: Option<String>, data: &[u8]) -> Self {
+			Self {
+				filename,
+				description,
+				hash: {
+					let hash = Sha256::digest(data);
+					let string = base16ct::lower::encode_string(&hash);
+
+					// We allocate twice, but it's only for testing,
+					// so it should be fineeeeeeee
+					format!("sha256_{string}")
+				},
+			}
+		}
+	}
+
 	/// Holds test-relevant data about a reply.
 	#[derive(Debug, Clone, Serialize)]
 	pub struct ReplyEssence {
@@ -159,17 +189,12 @@ pub mod mock {
 				attachments: message
 					.attachments
 					.into_iter()
-					.map(|attachment| AttachmentEssence {
-						filename: attachment.filename,
-						description: attachment.description,
-						hash: {
-							let hash = Sha256::digest(&attachment.data);
-							let string = base16ct::lower::encode_string(&hash);
-
-							// We allocate twice, but it's only at the end of tests,
-							// so it should be fineeeeeeee
-							format!("sha256_{string}")
-						},
+					.map(|attachment| {
+						AttachmentEssence::new(
+							attachment.filename,
+							attachment.description,
+							&attachment.data,
+						)
 					})
 					.collect(),
 			}
@@ -179,11 +204,16 @@ pub mod mock {
 	// {{{ Mock context
 	/// A mock context usable for testing. Messages and attachments are
 	/// accumulated inside a vec, and can be used for golden testing
-	/// (see [MockContext::golden])
+	/// (see [MockContext::golden]).
+	///
+	/// Moreover, downloaded attachment hashes are tracked so changes
+	/// to the input files require the test data to be regenerated.
 	pub struct MockContext {
 		pub user_id: u64,
 		pub data: UserContext,
+
 		messages: Vec<ReplyEssence>,
+		downloaded_files: Vec<AttachmentEssence>,
 	}
 
 	impl MockContext {
@@ -192,6 +222,7 @@ pub mod mock {
 				data,
 				user_id: 666,
 				messages: vec![],
+				downloaded_files: vec![],
 			}
 		}
 
@@ -210,17 +241,27 @@ pub mod mock {
 			}
 
 			fs::create_dir_all(path)?;
-			for (i, message) in self.messages.iter().enumerate() {
-				let message_file = path.join(format!("{i}.toml"));
 
-				if message_file.exists() {
-					assert_eq!(
-						toml::to_string_pretty(message)?,
-						fs::read_to_string(message_file)?
-					);
-				} else {
-					fs::write(&message_file, toml::to_string_pretty(message)?)?;
-				}
+			for (i, attachment) in self.downloaded_files.iter().enumerate() {
+				let file = path.join(format!("in_{i}.toml"));
+				Self::golden_impl(&file, &attachment)?;
+			}
+
+			for (i, message) in self.messages.iter().enumerate() {
+				let file = path.join(format!("out_{i}.toml"));
+				Self::golden_impl(&file, message)?;
+			}
+
+			Ok(())
+		}
+
+		/// Runs the golden testing logic for a single file.
+		/// See [Self::golden] for more details.
+		fn golden_impl(path: &Path, message: &impl Serialize) -> Result<(), Error> {
+			if path.exists() {
+				assert_eq!(toml::to_string_pretty(message)?, fs::read_to_string(path)?);
+			} else {
+				fs::write(path, toml::to_string_pretty(message)?)?;
 			}
 
 			Ok(())
@@ -274,10 +315,24 @@ pub mod mock {
 			NonZeroU64::new(666).unwrap()
 		}
 
-		async fn download(&self, attachment: &Self::Attachment) -> Result<Vec<u8>, Error> {
+		async fn download(
+			mutex: &tokio::sync::Mutex<&mut Self>,
+			attachment: &Self::Attachment,
+		) -> Result<Vec<u8>, Error> {
 			let res = tokio::fs::read(attachment)
 				.await
 				.with_context(|| format!("Could not download attachment {attachment:?}"))?;
+
+			let mut guard = mutex.lock().await;
+			guard.downloaded_files.push(AttachmentEssence::new(
+				attachment
+					.to_str()
+					.ok_or_else(|| anyhow!("Download path contains invalid unicode"))?
+					.to_owned(),
+				None,
+				&res,
+			));
+
 			Ok(res)
 		}
 		// }}}
diff --git a/src/lib.rs b/src/lib.rs
index f3abf87..bbc7a4e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 #![allow(clippy::needless_range_loop)]
 #![allow(clippy::redundant_closure)]
 #![feature(iter_map_windows)]
+#![feature(anonymous_lifetime_in_impl_trait)]
 #![feature(let_chains)]
 #![feature(array_try_map)]
 #![feature(async_closure)]
diff --git a/test/commands/chart/best/no_scores/0.toml b/test/commands/chart/best/no_scores/out_0.toml
similarity index 100%
rename from test/commands/chart/best/no_scores/0.toml
rename to test/commands/chart/best/no_scores/out_0.toml
diff --git a/test/commands/chart/best/pick_correct_score/in_0.toml b/test/commands/chart/best/pick_correct_score/in_0.toml
new file mode 100644
index 0000000..7d300c8
--- /dev/null
+++ b/test/commands/chart/best/pick_correct_score/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/antithese_74_kerning.jpg"
+hash = "sha256_7558ffb7c59018215955c4317ab14cb80f1d3bdf132d388c14a030ca526e2586"
diff --git a/test/commands/chart/best/pick_correct_score/in_1.toml b/test/commands/chart/best/pick_correct_score/in_1.toml
new file mode 100644
index 0000000..e49f315
--- /dev/null
+++ b/test/commands/chart/best/pick_correct_score/in_1.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/fracture_ray_ex.jpg"
+hash = "sha256_6aa2242fd40f71851ce826340fac5b53dbf3829568cf86bf5ed0ecc05ab89d2b"
diff --git a/test/commands/chart/best/pick_correct_score/in_2.toml b/test/commands/chart/best/pick_correct_score/in_2.toml
new file mode 100644
index 0000000..ff20a3f
--- /dev/null
+++ b/test/commands/chart/best/pick_correct_score/in_2.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/fracture_ray_missed_ex.jpg"
+hash = "sha256_6d6c10e9f946feb37df5925da0a14c70a9f42b68bb24a562bc295d301c956103"
diff --git a/test/commands/chart/best/pick_correct_score/0.toml b/test/commands/chart/best/pick_correct_score/out_0.toml
similarity index 100%
rename from test/commands/chart/best/pick_correct_score/0.toml
rename to test/commands/chart/best/pick_correct_score/out_0.toml
diff --git a/test/commands/chart/best/pick_correct_score/1.toml b/test/commands/chart/best/pick_correct_score/out_1.toml
similarity index 100%
rename from test/commands/chart/best/pick_correct_score/1.toml
rename to test/commands/chart/best/pick_correct_score/out_1.toml
diff --git a/test/commands/chart/info/last_byd/0.toml b/test/commands/chart/info/last_byd/out_0.toml
similarity index 100%
rename from test/commands/chart/info/last_byd/0.toml
rename to test/commands/chart/info/last_byd/out_0.toml
diff --git a/test/commands/chart/info/last_byd/1.toml b/test/commands/chart/info/last_byd/out_1.toml
similarity index 100%
rename from test/commands/chart/info/last_byd/1.toml
rename to test/commands/chart/info/last_byd/out_1.toml
diff --git a/test/commands/chart/info/no_suffix/0.toml b/test/commands/chart/info/no_suffix/out_0.toml
similarity index 100%
rename from test/commands/chart/info/no_suffix/0.toml
rename to test/commands/chart/info/no_suffix/out_0.toml
diff --git a/test/commands/chart/info/specify_difficulty/0.toml b/test/commands/chart/info/specify_difficulty/out_0.toml
similarity index 100%
rename from test/commands/chart/info/specify_difficulty/0.toml
rename to test/commands/chart/info/specify_difficulty/out_0.toml
diff --git a/test/commands/score/delete/delete_multiple/in_0.toml b/test/commands/score/delete/delete_multiple/in_0.toml
new file mode 100644
index 0000000..7d300c8
--- /dev/null
+++ b/test/commands/score/delete/delete_multiple/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/antithese_74_kerning.jpg"
+hash = "sha256_7558ffb7c59018215955c4317ab14cb80f1d3bdf132d388c14a030ca526e2586"
diff --git a/test/commands/score/delete/delete_multiple/in_1.toml b/test/commands/score/delete/delete_multiple/in_1.toml
new file mode 100644
index 0000000..b170ed2
--- /dev/null
+++ b/test/commands/score/delete/delete_multiple/in_1.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/alter_ego.jpg"
+hash = "sha256_5b88f5fc95b3146a0b2ed5c50e87410e4b26bb97026c293978790bf1344e0812"
diff --git a/test/commands/score/delete/delete_multiple/in_2.toml b/test/commands/score/delete/delete_multiple/in_2.toml
new file mode 100644
index 0000000..73d1e95
--- /dev/null
+++ b/test/commands/score/delete/delete_multiple/in_2.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/genocider_24_kerning.jpg"
+hash = "sha256_45556caf74d37b0aa818faed3d7efe4baf870e25005b80963dbe60b89638f511"
diff --git a/test/commands/score/delete/delete_multiple/0.toml b/test/commands/score/delete/delete_multiple/out_0.toml
similarity index 100%
rename from test/commands/score/delete/delete_multiple/0.toml
rename to test/commands/score/delete/delete_multiple/out_0.toml
diff --git a/test/commands/score/delete/delete_multiple/1.toml b/test/commands/score/delete/delete_multiple/out_1.toml
similarity index 100%
rename from test/commands/score/delete/delete_multiple/1.toml
rename to test/commands/score/delete/delete_multiple/out_1.toml
diff --git a/test/commands/score/delete/delete_multiple/2.toml b/test/commands/score/delete/delete_multiple/out_2.toml
similarity index 100%
rename from test/commands/score/delete/delete_multiple/2.toml
rename to test/commands/score/delete/delete_multiple/out_2.toml
diff --git a/test/commands/score/delete/delete_twice/in_0.toml b/test/commands/score/delete/delete_twice/in_0.toml
new file mode 100644
index 0000000..b170ed2
--- /dev/null
+++ b/test/commands/score/delete/delete_twice/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/alter_ego.jpg"
+hash = "sha256_5b88f5fc95b3146a0b2ed5c50e87410e4b26bb97026c293978790bf1344e0812"
diff --git a/test/commands/score/delete/delete_twice/0.toml b/test/commands/score/delete/delete_twice/out_0.toml
similarity index 100%
rename from test/commands/score/delete/delete_twice/0.toml
rename to test/commands/score/delete/delete_twice/out_0.toml
diff --git a/test/commands/score/delete/delete_twice/1.toml b/test/commands/score/delete/delete_twice/out_1.toml
similarity index 100%
rename from test/commands/score/delete/delete_twice/1.toml
rename to test/commands/score/delete/delete_twice/out_1.toml
diff --git a/test/commands/score/delete/delete_twice/2.toml b/test/commands/score/delete/delete_twice/out_2.toml
similarity index 100%
rename from test/commands/score/delete/delete_twice/2.toml
rename to test/commands/score/delete/delete_twice/out_2.toml
diff --git a/test/commands/score/delete/no_ids/0.toml b/test/commands/score/delete/no_ids/out_0.toml
similarity index 100%
rename from test/commands/score/delete/no_ids/0.toml
rename to test/commands/score/delete/no_ids/out_0.toml
diff --git a/test/commands/score/delete/no_show_after_delete/in_0.toml b/test/commands/score/delete/no_show_after_delete/in_0.toml
new file mode 100644
index 0000000..b170ed2
--- /dev/null
+++ b/test/commands/score/delete/no_show_after_delete/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/alter_ego.jpg"
+hash = "sha256_5b88f5fc95b3146a0b2ed5c50e87410e4b26bb97026c293978790bf1344e0812"
diff --git a/test/commands/score/delete/no_show_after_delete/0.toml b/test/commands/score/delete/no_show_after_delete/out_0.toml
similarity index 100%
rename from test/commands/score/delete/no_show_after_delete/0.toml
rename to test/commands/score/delete/no_show_after_delete/out_0.toml
diff --git a/test/commands/score/delete/no_show_after_delete/1.toml b/test/commands/score/delete/no_show_after_delete/out_1.toml
similarity index 100%
rename from test/commands/score/delete/no_show_after_delete/1.toml
rename to test/commands/score/delete/no_show_after_delete/out_1.toml
diff --git a/test/commands/score/delete/no_show_after_delete/2.toml b/test/commands/score/delete/no_show_after_delete/out_2.toml
similarity index 100%
rename from test/commands/score/delete/no_show_after_delete/2.toml
rename to test/commands/score/delete/no_show_after_delete/out_2.toml
diff --git a/test/commands/score/delete/nonexistent_id/0.toml b/test/commands/score/delete/nonexistent_id/out_0.toml
similarity index 100%
rename from test/commands/score/delete/nonexistent_id/0.toml
rename to test/commands/score/delete/nonexistent_id/out_0.toml
diff --git a/test/commands/score/magic/no_pics/0.toml b/test/commands/score/magic/no_pics/out_0.toml
similarity index 100%
rename from test/commands/score/magic/no_pics/0.toml
rename to test/commands/score/magic/no_pics/out_0.toml
diff --git a/test/commands/score/magic/single_pic/in_0.toml b/test/commands/score/magic/single_pic/in_0.toml
new file mode 100644
index 0000000..b170ed2
--- /dev/null
+++ b/test/commands/score/magic/single_pic/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/alter_ego.jpg"
+hash = "sha256_5b88f5fc95b3146a0b2ed5c50e87410e4b26bb97026c293978790bf1344e0812"
diff --git a/test/commands/score/magic/single_pic/0.toml b/test/commands/score/magic/single_pic/out_0.toml
similarity index 100%
rename from test/commands/score/magic/single_pic/0.toml
rename to test/commands/score/magic/single_pic/out_0.toml
diff --git a/test/commands/score/magic/weird_kerning/in_0.toml b/test/commands/score/magic/weird_kerning/in_0.toml
new file mode 100644
index 0000000..7d300c8
--- /dev/null
+++ b/test/commands/score/magic/weird_kerning/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/antithese_74_kerning.jpg"
+hash = "sha256_7558ffb7c59018215955c4317ab14cb80f1d3bdf132d388c14a030ca526e2586"
diff --git a/test/commands/score/magic/weird_kerning/in_1.toml b/test/commands/score/magic/weird_kerning/in_1.toml
new file mode 100644
index 0000000..73d1e95
--- /dev/null
+++ b/test/commands/score/magic/weird_kerning/in_1.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/genocider_24_kerning.jpg"
+hash = "sha256_45556caf74d37b0aa818faed3d7efe4baf870e25005b80963dbe60b89638f511"
diff --git a/test/commands/score/magic/weird_kerning/0.toml b/test/commands/score/magic/weird_kerning/out_0.toml
similarity index 100%
rename from test/commands/score/magic/weird_kerning/0.toml
rename to test/commands/score/magic/weird_kerning/out_0.toml
diff --git a/test/commands/score/show/agrees_with_magic/in_0.toml b/test/commands/score/show/agrees_with_magic/in_0.toml
new file mode 100644
index 0000000..7d300c8
--- /dev/null
+++ b/test/commands/score/show/agrees_with_magic/in_0.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/antithese_74_kerning.jpg"
+hash = "sha256_7558ffb7c59018215955c4317ab14cb80f1d3bdf132d388c14a030ca526e2586"
diff --git a/test/commands/score/show/agrees_with_magic/in_1.toml b/test/commands/score/show/agrees_with_magic/in_1.toml
new file mode 100644
index 0000000..b170ed2
--- /dev/null
+++ b/test/commands/score/show/agrees_with_magic/in_1.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/alter_ego.jpg"
+hash = "sha256_5b88f5fc95b3146a0b2ed5c50e87410e4b26bb97026c293978790bf1344e0812"
diff --git a/test/commands/score/show/agrees_with_magic/in_2.toml b/test/commands/score/show/agrees_with_magic/in_2.toml
new file mode 100644
index 0000000..73d1e95
--- /dev/null
+++ b/test/commands/score/show/agrees_with_magic/in_2.toml
@@ -0,0 +1,2 @@
+filename = "test/screenshots/genocider_24_kerning.jpg"
+hash = "sha256_45556caf74d37b0aa818faed3d7efe4baf870e25005b80963dbe60b89638f511"
diff --git a/test/commands/score/show/agrees_with_magic/0.toml b/test/commands/score/show/agrees_with_magic/out_0.toml
similarity index 100%
rename from test/commands/score/show/agrees_with_magic/0.toml
rename to test/commands/score/show/agrees_with_magic/out_0.toml
diff --git a/test/commands/score/show/agrees_with_magic/1.toml b/test/commands/score/show/agrees_with_magic/out_1.toml
similarity index 100%
rename from test/commands/score/show/agrees_with_magic/1.toml
rename to test/commands/score/show/agrees_with_magic/out_1.toml
diff --git a/test/commands/score/show/no_ids/0.toml b/test/commands/score/show/no_ids/out_0.toml
similarity index 100%
rename from test/commands/score/show/no_ids/0.toml
rename to test/commands/score/show/no_ids/out_0.toml
diff --git a/test/commands/score/show/nonexistent_id/0.toml b/test/commands/score/show/nonexistent_id/out_0.toml
similarity index 100%
rename from test/commands/score/show/nonexistent_id/0.toml
rename to test/commands/score/show/nonexistent_id/out_0.toml