Merge #675: test: use nixpkgs-unstable flake input for nix-bitcoin …

…pkgs

afbd8a3 test: use `nixpkgs-unstable` flake input for nix-bitcoin pkgs (Erik Arvstedt)

Pull request description:

ACKs for top commit:
  jonasnick:
    utACK afbd8a3

Tree-SHA512: ad5fba6cafff4acab4b63841b5376c0bc014eee9c40997b89ffbc52b1703453f7b064a7e61835b66f59136f6d5ea08670509d4e01085a972a46db3a7ec007648

flake.nix

@@ -26,7 +26,7 @@
         # "armv7l-linux"
       ];
 
-      test = import ./test/tests.nix nixpkgs.lib;
+      test = import ./test/tests.nix nixpkgs.lib self.nixosModules.default;
     in {
       lib = {
         mkNbPkgs = {

test/tests.nix

@@ -1,6 +1,6 @@
 # Integration tests, can be run without internet access.
 
-lib:
+lib: nixBitcoinModule:
 let
   # Included in all scenarios
   baseConfig = { config, pkgs, ... }: with lib; let
@@ -9,7 +9,7 @@ let
   in {
     imports = [
       ./lib/test-lib.nix
-      ../modules/modules.nix
+      nixBitcoinModule
       {
         # Features required by the Python test suite
         nix-bitcoin.secretsDir = "/secrets";