diff --git a/pkgs/build-support/install-shell-files/default.nix b/pkgs/build-support/install-shell-files/default.nix
index 1b7351847258..12595850c393 100644
--- a/pkgs/build-support/install-shell-files/default.nix
+++ b/pkgs/build-support/install-shell-files/default.nix
@@ -4,9 +4,8 @@
 let
   setupHook = makeSetupHook { name = "install-shell-files"; } ./setup-hook.sh;
 in
-
 setupHook.overrideAttrs (oldAttrs: {
-  passthru = (oldAttrs.passthru or {}) // {
+  passthru = (oldAttrs.passthru or { }) // {
     tests = callPackage ./tests { };
   };
 })
diff --git a/pkgs/build-support/install-shell-files/tests/default.nix b/pkgs/build-support/install-shell-files/tests/default.nix
index aef5acc1de6b..456edc5c6330 100644
--- a/pkgs/build-support/install-shell-files/tests/default.nix
+++ b/pkgs/build-support/install-shell-files/tests/default.nix
@@ -1,17 +1,26 @@
-{ lib, runCommandLocal, recurseIntoAttrs, installShellFiles }:
+{
+  lib,
+  runCommandLocal,
+  recurseIntoAttrs,
+  installShellFiles,
+}:
 
 let
-  runTest = name: env: buildCommand:
-    runCommandLocal "install-shell-files--${name}" ({
-      nativeBuildInputs = [ installShellFiles ];
-      meta.platforms = lib.platforms.all;
-    } // env) buildCommand;
+  runTest =
+    name: env: buildCommand:
+    runCommandLocal "install-shell-files--${name}" (
+      {
+        nativeBuildInputs = [ installShellFiles ];
+        meta.platforms = lib.platforms.all;
+      }
+      // env
+    ) buildCommand;
 in
 
 recurseIntoAttrs {
   # installManPage
 
-  install-manpage = runTest "install-manpage" {} ''
+  install-manpage = runTest "install-manpage" { } ''
     mkdir -p doc
     echo foo > doc/foo.1
     echo bar > doc/bar.2.gz
@@ -23,32 +32,39 @@ recurseIntoAttrs {
     cmp doc/bar.2.gz $out/share/man/man2/bar.2.gz
     cmp doc/baz.3 $out/share/man/man3/baz.3
   '';
-  install-manpage-outputs = runTest "install-manpage-outputs" {
-    outputs = [ "out" "man" "devman" ];
-  } ''
-    mkdir -p doc
-    echo foo > doc/foo.1
-    echo bar > doc/bar.3
+  install-manpage-outputs =
+    runTest "install-manpage-outputs"
+      {
+        outputs = [
+          "out"
+          "man"
+          "devman"
+        ];
+      }
+      ''
+        mkdir -p doc
+        echo foo > doc/foo.1
+        echo bar > doc/bar.3
 
-    installManPage doc/*
+        installManPage doc/*
 
-    # assert they didn't go into $out
-    [[ ! -f $out/share/man/man1/foo.1 && ! -f $out/share/man/man3/bar.3 ]]
+        # assert they didn't go into $out
+        [[ ! -f $out/share/man/man1/foo.1 && ! -f $out/share/man/man3/bar.3 ]]
 
-    # foo.1 alone went into man
-    cmp doc/foo.1 ''${!outputMan:?}/share/man/man1/foo.1
-    [[ ! -f ''${!outputMan:?}/share/man/man3/bar.3 ]]
+        # foo.1 alone went into man
+        cmp doc/foo.1 ''${!outputMan:?}/share/man/man1/foo.1
+        [[ ! -f ''${!outputMan:?}/share/man/man3/bar.3 ]]
 
-    # bar.3 alone went into devman
-    cmp doc/bar.3 ''${!outputDevman:?}/share/man/man3/bar.3
-    [[ ! -f ''${!outputDevman:?}/share/man/man1/foo.1 ]]
+        # bar.3 alone went into devman
+        cmp doc/bar.3 ''${!outputDevman:?}/share/man/man3/bar.3
+        [[ ! -f ''${!outputDevman:?}/share/man/man1/foo.1 ]]
 
-    touch $out
-  '';
+        touch $out
+      '';
 
   # installShellCompletion
 
-  install-completion = runTest "install-completion" {} ''
+  install-completion = runTest "install-completion" { } ''
     echo foo > foo
     echo bar > bar
     echo baz > baz
@@ -63,21 +79,27 @@ recurseIntoAttrs {
     cmp qux.zsh $out/share/zsh/site-functions/_qux
     cmp quux $out/share/fish/vendor_completions.d/quux
   '';
-  install-completion-output = runTest "install-completion-output" {
-    outputs = [ "out" "bin" ];
-  } ''
-    echo foo > foo
+  install-completion-output =
+    runTest "install-completion-output"
+      {
+        outputs = [
+          "out"
+          "bin"
+        ];
+      }
+      ''
+        echo foo > foo
 
-    installShellCompletion --bash foo
+        installShellCompletion --bash foo
 
-    # assert it didn't go into $out
-    [[ ! -f $out/share/bash-completion/completions/foo ]]
+        # assert it didn't go into $out
+        [[ ! -f $out/share/bash-completion/completions/foo ]]
 
-    cmp foo ''${!outputBin:?}/share/bash-completion/completions/foo
+        cmp foo ''${!outputBin:?}/share/bash-completion/completions/foo
 
-    touch $out
-  '';
-  install-completion-name = runTest "install-completion-name" {} ''
+        touch $out
+      '';
+  install-completion-name = runTest "install-completion-name" { } ''
     echo foo > foo
     echo bar > bar
     echo baz > baz
@@ -88,7 +110,7 @@ recurseIntoAttrs {
     cmp bar $out/share/zsh/site-functions/_foobar
     cmp baz $out/share/fish/vendor_completions.d/baz
   '';
-  install-completion-inference = runTest "install-completion-inference" {} ''
+  install-completion-inference = runTest "install-completion-inference" { } ''
     echo foo > foo.bash
     echo bar > bar.zsh
     echo baz > baz.fish
@@ -99,7 +121,7 @@ recurseIntoAttrs {
     cmp bar.zsh $out/share/zsh/site-functions/_bar
     cmp baz.fish $out/share/fish/vendor_completions.d/baz.fish
   '';
-  install-completion-cmd = runTest "install-completion-cmd" {} ''
+  install-completion-cmd = runTest "install-completion-cmd" { } ''
     echo foo > foo.bash
     echo bar > bar.zsh
     echo baz > baz.fish
@@ -112,7 +134,7 @@ recurseIntoAttrs {
     cmp baz.fish $out/share/fish/vendor_completions.d/foobar.fish
     cmp qux.fish $out/share/fish/vendor_completions.d/qux
   '';
-  install-completion-fifo = runTest "install-completion-fifo" {} ''
+  install-completion-fifo = runTest "install-completion-fifo" { } ''
     installShellCompletion \
       --bash --name foo.bash <(echo foo) \
       --zsh --name _foo <(echo bar) \