tests/test-derivation: allow tests to be modules

Use `mkTestDerivationFromNixvimModule` instead of `mkTestDerivation`,
allowing "proper" modules to be used instead of plain attr configs.

This is useful for more complex tests that wish to use `config` or
`options` arguments, e.g:

```nix
{config, options, ...}: {
  /* some cool test */
}
```

To allow `tests.dontRun` to be defined on such a test, the module is
allowed to be nested as `module`, e.g:

```nix
{
  tests.dontRun = true;
  module = {config, options, ...}: {
    /* a disabled test */
  };
}
```

Also ended up doing some general cleanup, removing an unused function,
etc.

flake-modules/tests.nix

@@ -3,25 +3,21 @@
   perSystem =
     {
       pkgs,
-      config,
+      pkgsUnfree,
       system,
       helpers,
-      makeNixvimWithModuleUnfree,
       makeNixvimWithModule,
       ...
     }:
     {
       checks = {
         tests = import ../tests {
-          inherit pkgs helpers makeNixvimWithModule;
-          inherit (pkgs) lib;
-          makeNixvim =
-            configuration:
-            makeNixvimWithModuleUnfree {
-              module = {
-                config = configuration;
-              };
-            };
+          inherit
+            pkgs
+            pkgsUnfree
+            helpers
+            makeNixvimWithModule
+            ;
         };
 
         extra-args-tests = import ../tests/extra-args.nix {

flake-modules/wrappers.nix

@@ -14,18 +14,10 @@ let
 in
 {
   perSystem =
-    {
-      system,
-      pkgs,
-      pkgsUnfree,
-      config,
-      ...
-    }:
+    { system, pkgs, ... }:
     {
       _module.args = {
         makeNixvimWithModule = import ../wrappers/standalone.nix pkgs wrapperArgs;
-
-        makeNixvimWithModuleUnfree = import ../wrappers/standalone.nix pkgsUnfree wrapperArgs;
       };
 
       checks =

tests/default.nix

@@ -1,14 +1,14 @@
 {
-  makeNixvim,
   makeNixvimWithModule,
-  lib,
+  lib ? pkgs.lib,
   helpers,
   pkgs,
+  pkgsUnfree,
 }:
 let
   fetchTests = import ./fetch-tests.nix;
-  test-derivation = import ./test-derivation.nix { inherit pkgs makeNixvim makeNixvimWithModule; };
-  inherit (test-derivation) mkTestDerivation;
+  test-derivation = import ./test-derivation.nix { inherit pkgs makeNixvimWithModule; };
+  inherit (test-derivation) mkTestDerivationFromNixvimModule;
 
   # List of files containing configurations
   testFiles = fetchTests {
@@ -31,9 +31,16 @@ let
   };
 
   # We attempt to build & execute all configurations
-  derivationList = pkgs.lib.mapAttrsToList (name: path: {
+  derivationList = pkgs.lib.mapAttrsToList (name: def: {
     inherit name;
-    path = mkTestDerivation name path;
+    path = mkTestDerivationFromNixvimModule {
+      inherit name;
+      # The module can either be the actual definition,
+      # or a child attr named `module`.
+      module = def.module or lib.removeAttrs def [ "tests" ];
+      dontRun = def.tests.dontRun or false;
+      pkgs = pkgsUnfree;
+    };
   }) (testFiles // exampleFiles);
 in
 pkgs.linkFarm "nixvim-tests" derivationList

tests/test-derivation.nix

@@ -1,8 +1,4 @@
-{
-  pkgs,
-  makeNixvim,
-  makeNixvimWithModule,
-}:
+{ pkgs, makeNixvimWithModule, ... }:
 let
   # Create a nix derivation from a nixvim executable.
   # The build phase simply consists in running the provided nvim binary.
@@ -46,12 +42,15 @@ let
       '';
     };
 
+  # Create a nix derivation from a nixvim configuration.
+  # The build phase simply consists in running neovim with the given configuration.
   mkTestDerivationFromNixvimModule =
     {
       name ? "nixvim-check",
-      pkgs,
+      pkgs ? pkgs,
       module,
       extraSpecialArgs ? { },
+      dontRun ? false,
     }:
     let
       nvim = makeNixvimWithModule {
@@ -59,21 +58,8 @@ let
         _nixvimTests = true;
       };
     in
-    mkTestDerivationFromNvim { inherit name nvim; };
-
-  # Create a nix derivation from a nixvim configuration.
-  # The build phase simply consists in running neovim with the given configuration.
-  mkTestDerivation =
-    name: config:
-    let
-      testAttributes = if builtins.hasAttr "tests" config then config.tests else { dontRun = false; };
-      nvim = makeNixvim (pkgs.lib.attrsets.filterAttrs (n: _: n != "tests") config);
-    in
-    mkTestDerivationFromNvim {
-      inherit name nvim;
-      inherit (testAttributes) dontRun;
-    };
+    mkTestDerivationFromNvim { inherit name nvim dontRun; };
 in
 {
-  inherit mkTestDerivation mkTestDerivationFromNvim mkTestDerivationFromNixvimModule;
+  inherit mkTestDerivationFromNvim mkTestDerivationFromNixvimModule;
 }