diff --git a/.gitignore b/.gitignore
index 928f5aa..b0e641b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,12 @@
+# Build and test artifacts.
 /target
 *.sqlite*
 *.key
+*.profraw
+result
+result-*
 
+# Test configurations.
 config.toml
 /test-frontend/default.json
 /test-frontend/.well-known
-result
-result-*
diff --git a/flake.nix b/flake.nix
index 2f9dcf3..4f93d5a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -97,7 +97,10 @@ rec {
         {
           default = pkgs.mkShell {
             inputsFrom = [ self.packages.${system}.default ];
-            nativeBuildInputs = [ pkgs.buildPackages.sqlite-interactive ];
+            nativeBuildInputs = [
+              pkgs.buildPackages.sqlite-interactive
+              pkgs.cargo-llvm-cov
+            ];
 
             env.RUST_LOG = "blahd=debug,blahctl=debug";
           };
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index d116724..0cd810a 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -5,3 +5,4 @@
 [toolchain]
 channel = "beta-2024-09-10" # 1.82.0-beta.3
 profile = "default"
+components = ["llvm-tools"]