tests: drop -test prefix to match naming style used by NixOS tests

tests/eval.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -e
+
+cd "$(dirname "$0")/.."
+
+for profile in $(find . -name default.nix); do
+  echo evaluating $profile >&2
+
+  nix-build '<nixpkgs/nixos>' \
+    -I nixos-config=tests/eval.nix \
+    -I nixos-hardware-profile=$profile \
+    -A system \
+    --dry-run \
+    --show-trace
+done