diff --git a/lua/neotest-golang/lib/cmd.lua b/lua/neotest-golang/lib/cmd.lua
index a1e31c39..bc9d546e 100644
--- a/lua/neotest-golang/lib/cmd.lua
+++ b/lua/neotest-golang/lib/cmd.lua
@@ -54,45 +54,23 @@ function M.test_command_in_package_with_regexp(package_or_path, regexp)
   return cmd, json_filepath
 end
 
-function M.test_command(go_test_required_args)
+function M.test_command(required_go_test_args)
   --- The runner to use for running tests.
   --- @type string
   local runner = M.runner_fallback(options.get().runner)
 
-  --- The filepath to write test output JSON to, if using `gotestsum`.
+  --- Optional and custom filepath for writing test output.
   --- @type string | nil
-  local json_filepath = nil
+  local test_output_filepath = nil
 
   --- The final test command to execute.
   --- @type table<string>
   local cmd = {}
 
-  if runner == "go" then
-    cmd = M.go_test(go_test_required_args)
-  elseif runner == "gotestsum" then
-    json_filepath = vim.fs.normalize(async.fn.tempname())
-    cmd = M.gotestsum(go_test_required_args, json_filepath)
-  end
-
+  cmd, test_output_filepath =
+    options.get().runners[runner].cmd(required_go_test_args)
   logger.info("Test command: " .. table.concat(cmd, " "))
-
-  return cmd, json_filepath
-end
-
-function M.go_test(go_test_required_args)
-  local cmd = { "go", "test", "-json" }
-  cmd = vim.list_extend(vim.deepcopy(cmd), options.get().go_test_args)
-  cmd = vim.list_extend(vim.deepcopy(cmd), go_test_required_args)
-  return cmd
-end
-
-function M.gotestsum(go_test_required_args, json_filepath)
-  local cmd = { "gotestsum", "--jsonfile=" .. json_filepath }
-  cmd = vim.list_extend(vim.deepcopy(cmd), options.get().gotestsum_args)
-  cmd = vim.list_extend(vim.deepcopy(cmd), { "--" })
-  cmd = vim.list_extend(vim.deepcopy(cmd), options.get().go_test_args)
-  cmd = vim.list_extend(vim.deepcopy(cmd), go_test_required_args)
-  return cmd
+  return cmd, test_output_filepath
 end
 
 function M.runner_fallback(executable)
diff --git a/lua/neotest-golang/options.lua b/lua/neotest-golang/options.lua
index f94f87db..8fdb0863 100644
--- a/lua/neotest-golang/options.lua
+++ b/lua/neotest-golang/options.lua
@@ -3,23 +3,63 @@
 --- details and examples.
 
 local logger = require("neotest-golang.logging")
+local async = require("neotest.async")
 
 local M = {}
 
-local opts = {
-  go_test_args = { "-v", "-race", "-count=1" },
-  go_list_args = {},
+local defaults = {
+  runner = "go", -- corresponds to a key in the 'runners' table
+  go_test_args = { "-v", "-race", "-count=1" }, -- NOTE: can also be a function
+  gotestsum_args = { "--format=standard-verbose" }, -- NOTE: can also be a function
+  go_list_args = {}, -- NOTE: can also be a function
   dap_go_opts = {},
   testify_enabled = false,
   warn_test_name_dupes = true,
   warn_test_not_executed = true,
 
   -- experimental, for now undocumented, options
-  runner = "go", -- or "gotestsum"
-  gotestsum_args = { "--format=standard-verbose" },
   dev_notifications = false,
 }
 
+local default_runners = {
+  runners = {
+    go = {
+      cmd = function(required_go_test_args)
+        local cmd = { "go", "test", "-json" }
+        local go_test_args = defaults.go_test_args
+        if type(go_test_args) == "function" then
+          go_test_args = go_test_args()
+        end
+        cmd = vim.list_extend(vim.deepcopy(cmd), go_test_args)
+        cmd = vim.list_extend(vim.deepcopy(cmd), required_go_test_args)
+        return cmd, nil
+      end,
+    },
+    gotestsum = {
+      cmd = function(required_go_test_args)
+        local json_filepath = vim.fs.normalize(async.fn.tempname())
+        local cmd = { "gotestsum", "--jsonfile=" .. json_filepath }
+        local gotestsum_args = defaults.gotestsum_args
+        if type(gotestsum_args) == "function" then
+          gotestsum_args = gotestsum_args()
+        end
+        local gotest_args = defaults.go_test_args
+        local go_test_args = defaults.go_test_args
+        if type(go_test_args) == "function" then
+          go_test_args = go_test_args()
+        end
+        cmd = vim.list_extend(vim.deepcopy(cmd), gotestsum_args)
+        cmd = vim.list_extend(vim.deepcopy(cmd), { "--" })
+        cmd = vim.list_extend(vim.deepcopy(cmd), gotest_args)
+        cmd = vim.list_extend(vim.deepcopy(cmd), required_go_test_args)
+        return cmd, json_filepath
+      end,
+    },
+  },
+}
+
+local opts = vim.tbl_extend("force", defaults, default_runners)
+
 function M.setup(user_opts)
   if type(user_opts) == "table" and not vim.tbl_isempty(user_opts) then
     for k, v in pairs(user_opts) do