1 files changed, 43 insertions, 0 deletions
diff --git a/tests/lib.sh b/tests/lib.sh
new file mode 100644
index 0000000..13b1ded
--- /dev/null
+++ b/tests/lib.sh
@@ -0,0 +1,43 @@
+# Helpers for preparing and checking scenarios, sourced on the machine
+# populate deploys to.
+set -efu
+
+fail() {
+  printf 'FAIL: %s\n' "$*" >&2
+  exit 1
+}
+
+# usage: expect_eq WHAT ACTUAL EXPECTED
+expect_eq() {
+  if test "$2" != "$3"; then
+    fail "$1: expected '$3', got '$2'"
+  fi
+}
+
+nix() {
+  command nix --extra-experimental-features 'nix-command flakes' "$@"
+}
+
+# Evaluates a flake output without network access to the fixtures, so all
+# inputs must be in the store.
+nix_eval() {
+  env \
+      http_proxy=http://127.0.0.1:9 https_proxy=http://127.0.0.1:9 \
+      HTTP_PROXY=http://127.0.0.1:9 HTTPS_PROXY=http://127.0.0.1:9 \
+      all_proxy=http://127.0.0.1:9 ALL_PROXY=http://127.0.0.1:9 \
+      no_proxy= NO_PROXY= \
+    nix --extra-experimental-features 'nix-command flakes' eval --raw "$@"
+}
+
+# Evaluates a flake output, fetching missing inputs.
+nix_eval_online() {
+  nix eval --raw "$@"
+}
+
+# Collects garbage if KROPS_TEST_GC is set, so evaluating afterwards checks
+# that delivered store paths are registered as garbage collector roots.
+gc() {
+  if test -n "${KROPS_TEST_GC-}"; then
+    nix-store --gc >/dev/null
+  fi
+}