test: add basic test for flakeModule functionality

flake.nix

@@ -21,14 +21,14 @@
       cellBlocks = with ren.blocks; [
         (simple "devShells")
         (simple "pkgs")
-        # (simple "tests")
+        (simple "tests")
         # (simple "docs")
         (simple "ci")
       ];
     }
     {
       packages = ren.select self [
-        # ["repo" "tests"]
+        ["repo" "tests"]
         # ["repo" "docs"]
         ["repo" "ci" "packages"]
         ["packages" "pkgs"]

nix/repo/flake.lock

@@ -17,9 +17,27 @@
         "type": "gitlab"
       }
     },
+    "nixtest-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1753957623,
+        "narHash": "sha256-kdImwKx57N0QL8HPUUb5ADwXFgSjaNOk39b/eKlzyTo=",
+        "owner": "TECHNOFAB",
+        "repo": "nixtest",
+        "rev": "22b43c9fe83be73c3f0648bbb54bc3c1cf7f96df",
+        "type": "gitlab"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "TECHNOFAB",
+        "repo": "nixtest",
+        "type": "gitlab"
+      }
+    },
     "root": {
       "inputs": {
         "devshell-lib": "devshell-lib",
+        "nixtest-lib": "nixtest-lib",
         "treefmt-nix": "treefmt-nix"
       }
     },

nix/repo/flake.nix

@@ -1,6 +1,7 @@
 {
   inputs = {
     devshell-lib.url = "gitlab:rensa-nix/devshell?dir=lib";
+    nixtest-lib.url = "gitlab:TECHNOFAB/nixtest?dir=lib";
     treefmt-nix = {
       url = "github:numtide/treefmt-nix";
       flake = false;
@@ -10,6 +11,7 @@
     i
     // {
       devshell = i.devshell-lib.lib {inherit (i.parent) pkgs;};
+      ntlib = i.nixtest-lib.lib {inherit (i.parent) pkgs;};
       cilib = import "${i.parent.self}/lib" {inherit (i.parent) pkgs;};
       treefmt = import i.treefmt-nix;
     };

nix/repo/tests.nix

@@ -0,0 +1,10 @@
+{inputs, ...}: let
+  inherit (inputs) pkgs ntlib cilib;
+in {
+  tests = ntlib.mkNixtest {
+    modules = ntlib.autodiscover {dir = "${inputs.self}/tests";};
+    args = {
+      inherit pkgs ntlib cilib;
+    };
+  };
+}

tests/fixtures/flake_parts/flake.nix

@@ -6,13 +6,11 @@
   } @ inputs:
     flake-parts.lib.mkFlake {inherit inputs;} {
       imports = [
-        ../lib/flakeModule.nix
+        "@repo_path@/lib/flakeModule.nix"
       ];
       systems = import systems;
       flake = {};
-      perSystem = {
+      perSystem = _: {
-        ...
-      }: {
         ci = {
           config = {
             # true is already default, just for testing

tests/flake_parts_test.nix

@@ -0,0 +1,39 @@
+{
+  pkgs,
+  ntlib,
+  ...
+}: {
+  suites."flake-parts" = {
+    pos = __curPos;
+    tests = [
+      {
+        name = "flakeModule";
+        type = "script";
+        script =
+          # sh
+          ''
+            ${ntlib.helpers.scriptHelpers}
+            ${ntlib.helpers.path (with pkgs; [coreutils nix gnused gnugrep jq])}
+            repo_path=${../.}
+
+            dir=$(mktemp -d)
+            trap "rm -rf $dir" EXIT
+            cd $dir
+            cp ${./fixtures/flake_parts}/* .
+            # import from the absolute path above, is easier than trying to figure out the repo path etc.
+            sed -i -e "s|@repo_path@|$repo_path|" flake.nix
+
+            # NOTE: --impure is required since importing modules from absolute paths is not allowed in pure mode
+            nix build --impure .#gitlab-ci:pipeline:default
+            assert "-f result" "should exist"
+            assert_file_contains "result" "finalize_nix_ci"
+            jq '.' result  # check if valid json just to be sure
+
+            nix build --impure .#gitlab-ci:pipeline:default:pretty
+            assert "-f result" "should exist"
+            assert_file_contains "result" "  - finalize_nix_ci"
+          '';
+      }
+    ];
+  };
+}