fix TSamFailedOnly and the output formatting for the go-runner

tests/test_samurai_go_spec.lua

@@ -1,4 +1,5 @@
 local go_runner = require("test-samurai.runners.go")
+local util = require("test-samurai.util")
 
 describe("test-samurai go runner", function()
   it("detects Go test files by suffix", function()
@@ -112,4 +113,35 @@ describe("test-samurai go runner", function()
       cmd_spec_func.cmd
     )
   end)
+
+  it("build_file_command uses exact test names from current file", function()
+    local bufnr = vim.api.nvim_create_buf(false, true)
+    vim.api.nvim_buf_set_name(bufnr, "/tmp/project/get_test.go")
+    local lines = {
+      "package main",
+      "import \"testing\"",
+      "",
+      "func TestHandleGet(t *testing.T) {",
+      "  t.Run(\"returns_200\", func(t *testing.T) {",
+      "    -- inside test",
+      "  })",
+      "}",
+    }
+    vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
+
+    local orig_find_root = util.find_root
+    util.find_root = function(path, markers)
+      return "/tmp/project"
+    end
+
+    local cmd_spec = go_runner.build_file_command(bufnr)
+
+    util.find_root = orig_find_root
+
+    assert.are.same(
+      { "go", "test", "-json", "./", "-run", "^(TestHandleGet)$" },
+      cmd_spec.cmd
+    )
+    assert.equals("/tmp/project", cmd_spec.cwd)
+  end)
 end)