plugins/comment: add tests

tests/test-sources/plugins/utils/comment.nix

@@ -0,0 +1,61 @@
+{
+  empty = {
+    plugins.comment.enable = true;
+  };
+
+  defaults = {
+    plugins.comment = {
+      enable = true;
+
+      settings = {
+        padding = true;
+        sticky = true;
+        ignore = null;
+        toggler = {
+          line = "gcc";
+          block = "gbc";
+        };
+        opleader = {
+          line = "gc";
+          block = "gb";
+        };
+        extra = {
+          above = "gcO";
+          below = "gco";
+          eol = "gcA";
+        };
+        mappings = {
+          basic = true;
+          extra = true;
+        };
+        pre_hook = null;
+        post_hook = null;
+      };
+    };
+  };
+
+  example = {
+    plugins = {
+      treesitter.enable = true;
+      ts-context-commentstring.enable = true;
+
+      comment = {
+        enable = true;
+
+        settings = {
+          ignore = "^const(.*)=(%s?)%((.*)%)(%s?)=>";
+          pre_hook = "require('ts_context_commentstring.integrations.comment_nvim').create_pre_hook()";
+          post_hook = ''
+            function(ctx)
+                if ctx.range.srow == ctx.range.erow then
+                    -- do something with the current line
+                else
+                    -- do something with lines range
+                end
+            end
+          '';
+        };
+      };
+    };
+  };
+}