cargo: add cargoHome option

tests/modules/programs/cargo/cargo-home.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  programs.cargo = {
+    enable = true;
+
+    cargoHome = "${config.xdg.dataHome}/cargo";
+
+    settings = {
+      net = {
+        git-fetch-with-cli = true;
+      };
+    };
+  };
+
+  nmt.script =
+    let
+      cargoTestPath = "home-files/.local/share/cargo";
+      configTestPath = "${cargoTestPath}/config.toml";
+    in
+    ''
+      assertPathNotExists home-files/.cargo/config
+      assertDirectoryExists ${cargoTestPath}
+      assertFileExists ${configTestPath}
+      assertFileContent ${configTestPath} \
+        ${./example-config.toml}
+    '';
+}

tests/modules/programs/cargo/default.nix

@@ -1,4 +1,5 @@
 {
   cargo = ./example-config.nix;
   cargo-empty-config = ./empty-config.nix;
+  cargo-home = ./cargo-home.nix;
 }