diff --git a/tests/pixelfed-garage.nix b/tests/pixelfed-garage.nix
index 853b01f..e084cb0 100644
--- a/tests/pixelfed-garage.nix
+++ b/tests/pixelfed-garage.nix
@@ -3,6 +3,9 @@ let
   lib = pkgs.lib;
   rebuildableTest = import ./rebuildableTest.nix pkgs;
 
+  email = "test@test.com";
+  password = "testtest";
+
   # FIXME: Replace all the By.XPATH by By.CSS_SELECTOR.
 
   seleniumImports = ''
@@ -22,7 +25,7 @@ let
     driver.set_window_size(1280, 960)
   '';
 
-  seleniumPixelfedLogin = email: password: ''
+  seleniumPixelfedLogin = ''
     print("Open login page...", file=sys.stderr)
     driver.get("http://pixelfed.localhost/login")
     print("Enter email...", file=sys.stderr)
@@ -56,7 +59,7 @@ let
     from selenium.webdriver.support.wait import WebDriverWait
 
     ${seleniumSetup}
-    ${seleniumPixelfedLogin "sys.argv[1]" "sys.argv[2]"}
+    ${seleniumPixelfedLogin}
     time.sleep(3)
 
     media_path = os.environ['POST_MEDIA']
@@ -95,7 +98,7 @@ let
     } ''
     ${seleniumImports}
     ${seleniumSetup}
-    ${seleniumPixelfedLogin "sys.argv[1]" "sys.argv[2]"}
+    ${seleniumPixelfedLogin}
 
     img = driver.find_element(
         By.XPATH,
@@ -169,8 +172,7 @@ pkgs.nixosTest {
       server.wait_for_unit("phpfpm-pixelfed.service")
 
     with subtest("Account creation"):
-      password = "testtest"
-      server.succeed(f"pixelfed-manage user:create --name=test --username=test --email=test@test.com --password={password} --confirm_email=1")
+      server.succeed(f"pixelfed-manage user:create --name=test --username=test --email=${email} --password=${password} --confirm_email=1")
 
     # NOTE: This could in theory give a false positive if pixelfed changes it's
     # colorscheme to include pure green. (see same problem in pixelfed-garage.nix).
@@ -178,7 +180,7 @@ pkgs.nixosTest {
     # there, then post a green image and check that the green pixel IS there.
 
     with subtest("Image displays"):
-      server.succeed(f"su - selenium -c 'selenium-script-post-picture test@test.com {password}'")
+      server.succeed(f"su - selenium -c 'selenium-script-post-picture ${email} ${password}'")
       server.copy_from_vm("/home/selenium/screenshot.png", "")
       displayed_colors = server.succeed("magick /home/selenium/screenshot.png -define histogram:unique-colors=true -format %c histogram:info:")
       # check that the green image displayed somewhere
@@ -202,7 +204,7 @@ pkgs.nixosTest {
         raise Exception("image stored in garage did not match image uploaded")
 
     with subtest("Check that image comes from garage"):
-      src = server.succeed(f"su - selenium -c 'selenium-script-get-src test@test.com {password}'")
+      src = server.succeed(f"su - selenium -c 'selenium-script-get-src ${email} ${password}'")
       if not src.startswith("http://pixelfed.web.garage.localhost:3902/"):
         raise Exception("image does not come from garage")
   '';