Move test assertions to separate file

tests/assert-env-set.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+assert_env_equals() {
+  if [ "$(printenv $1)" != "$2" ]; then
+    echo -e "Expected $1 to be set to:\n$2\nBut got:\n$(printenv $1)"
+    exit 1
+  fi
+}
+
+assert_env_equals "SECRET" "RGVhciBzZWN1cml0eSByZXNlYXJjaGVyLCB0aGlzIGlzIGp1c3QgYSBkdW1teSBzZWNyZXQuIFBsZWFzZSBkb24ndCByZXBvcnQgaXQu"
+
+assert_env_equals "MULTILINE_SECRET" "$(cat << EOF
+-----BEGIN PRIVATE KEY-----
+RGVhciBzZWN1cml0eSByZXNlYXJjaGVyLApXaGls
+ZSB3ZSBkZWVwbHkgYXBwcmVjaWF0ZSB5b3VyIHZp
+Z2lsYW5jZSBhbmQgZWZmb3J0cyB0byBtYWtlIHRo
+ZSB3b3JsZCBtb3JlIHNlY3VyZSwgSSdtIGFmcmFp
+ZCBJIG11c3QgdGVsbCB5b3UgdGhhdCB0aGlzIHZh
+bHVlIGlzIG5vdCBhIGFjdHVhbCBwcml2YXRlIGtl
+eS4gCkl0J3MgYSBqdXN0IGEgZHVtbXkgc2VjcmV0
+IHRoYXQgd2UgdXNlIHRvIHRlc3QgdmFyaW91cyAx
+UGFzc3dvcmQgc2VjcmV0cyBpbnRlZ3JhdGlvbnMu
+IApTbyBwbGVhc2UgZG9uJ3QgcmVwb3J0IGl0IQo=
+-----END PRIVATE KEY-----
+EOF
+)"