lib/test: move from tests/test-derivation

lib/default.nix

@@ -7,6 +7,6 @@
 }@args:
 {
   # Add all exported modules here
-  check = import ../tests/test-derivation.nix { inherit lib pkgs; };
+  check = import ./tests.nix { inherit lib pkgs; };
   helpers = import ./helpers.nix (args // { inherit _nixvimTests; });
 }

lib/tests.nix

@@ -0,0 +1,71 @@
+{
+  pkgs,
+  lib ? pkgs.lib,
+  ...
+}:
+let
+  # Create a nix derivation from a nixvim executable.
+  # The build phase simply consists in running the provided nvim binary.
+  mkTestDerivationFromNvim =
+    {
+      name,
+      nvim,
+      # TODO: Deprecated 2024-08-20, remove after 24.11
+      dontRun ? false,
+      ...
+    }@args:
+    let
+      # FIXME: this doesn't support helpers.enableExceptInTests, a context option would be better
+      result = nvim.extend {
+        config.test =
+          {
+            inherit name;
+          }
+          // lib.optionalAttrs (args ? dontRun) (
+            lib.warn
+              "mkTestDerivationFromNvim: the `dontRun` argument is deprecated. You should use the `test.runNvim` module option instead."
+              { runNvim = !dontRun; }
+          );
+      };
+    in
+    result.config.test.derivation;
+
+  # Create a nix derivation from a nixvim configuration.
+  # The build phase simply consists in running neovim with the given configuration.
+  mkTestDerivationFromNixvimModule =
+    {
+      name ? null,
+      pkgs ? pkgs,
+      module,
+      extraSpecialArgs ? { },
+      # TODO: Deprecated 2024-08-20, remove after 24.11
+      dontRun ? false,
+    }@args:
+    let
+      helpers = import ../lib/helpers.nix {
+        inherit pkgs lib;
+        # TODO: deprecate helpers.enableExceptInTests,
+        # add a context option e.g. `config.isTest`?
+        _nixvimTests = true;
+      };
+
+      result = helpers.modules.evalNixvim {
+        modules = [
+          module
+          (lib.optionalAttrs (name != null) { test.name = name; })
+          (lib.optionalAttrs (args ? dontRun) (
+            lib.warn
+              "mkTestDerivationFromNixvimModule: the `dontRun` argument is deprecated. You should use the `test.runNvim` module option instead."
+              { config.test.runNvim = !dontRun; }
+          ))
+        ];
+        extraSpecialArgs = {
+          defaultPkgs = pkgs;
+        } // extraSpecialArgs;
+      };
+    in
+    result.config.test.derivation;
+in
+{
+  inherit mkTestDerivationFromNvim mkTestDerivationFromNixvimModule;
+}