diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e55f053..948c905 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -61,7 +61,7 @@ If you want to contribute art or the like, do that in whatever **you** are most
 
 [typst]: https://typst.app
 [Rust]: https://www.rust-lang.org
-[Inkscape]: https://inkscape.org/ 
+[Inkscape]: https://inkscape.org/
 [GIMP]: https://www.gimp.org/
 [Blender]: https://www.blender.org/
 [Penpot]: https://penpot.app/
diff --git a/Cargo.toml b/Cargo.toml
index d14a2e5..f4aa395 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [workspace]
-members = [ 
-  "crates/executor", 
+members = [
+  "crates/executor",
   "crates/ir",
-  "crates/cli", 
+  "crates/cli",
 ]
 resolver = "2"
 
diff --git a/docs/design/type-notation.typ b/docs/design/type-notation.typ
index 7858b50..ee33517 100644
--- a/docs/design/type-notation.typ
+++ b/docs/design/type-notation.typ
@@ -32,7 +32,7 @@ One dimensional list of 32 bit signed integers:
 [i32]
 ```
 
-Due to inference, you'll also be able to use that in some mathematical operations with integers: 
+Due to inference, you'll also be able to use that in some mathematical operations with integers:
 
 `[i32] + i32` is a valid operation, for example (of course, you can't add types.) But that wouldn't add the second one to the list, but rather add the single i32 to all values in the left hand side list). That would also work with more dimensional arrays and dynamic streams like videos. 
 
diff --git a/flake.nix b/flake.nix
index b0d5bde..da80ec2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -35,9 +35,10 @@
                     clippy.enable = true;
                     rustfmt.enable = true;
                   };
-                
+
                   packages = with pkgs; [
                     just nushell
+                    ripgrep
                     typst typst-lsp
                     mold
                     cargo-nextest cargo-watch
diff --git a/justfile b/justfile
index 396f6eb..468c9fb 100644
--- a/justfile
+++ b/justfile
@@ -1,5 +1,9 @@
 all: test docs
 
+test:
+  #!/usr/bin/env nu
+  cargo nextest run
+
 # Compile all documentation as in proposals and design documents, placing them under `docs/compiled`.
 docs:
   #!/usr/bin/env nu
@@ -12,6 +16,8 @@ docs:
     mv $pdf docs/compiled
   } | ignore
 
-test:
+fmt:
   #!/usr/bin/env nu
-  cargo nextest run
+  cargo fmt
+  echo "Places where whitespace is at the end of a line:"
+  rg '\s$'
diff --git a/testfiles/bare.ron b/testfiles/bare.ron
index 1770e37..a9c97c8 100644
--- a/testfiles/bare.ron
+++ b/testfiles/bare.ron
@@ -1,12 +1,12 @@
 (
 	[
 		Read((
-			source: File("/home/jade/example/file.png"), 
-			format: Png
+			source: File("testfiles/juan.png"),
+			format: Jpeg
 		)),
 		Write(( 
-			target: File("/home/jade/example/out.jpg"), 
-			format: Jpeg
+			target: File("testfiles/out.png"),
+			format: Png
 		))
 	]
 )
diff --git a/testfiles/invert.ron b/testfiles/invert.ron
index 5f235a9..80179f1 100644
--- a/testfiles/invert.ron
+++ b/testfiles/invert.ron
@@ -2,7 +2,7 @@
 	[
 		Read((
 			source: File("testfiles/juan.jpg"),
-			format: Png
+			format: Jpeg
 		)),
 		Filter(Invert),
 		Write((