fix TSamFailedOnly and the output formatting for the mocha-runner

tests/test_samurai_failed_only_spec.lua

@@ -221,6 +221,77 @@ describe("TSamFailedOnly", function()
     assert.is_false(has_raw)
   end)
 
+  it("reruns failed mocha tests from json-stream array output without raw JSON", function()
+    test_samurai.setup({
+      runner_modules = {
+        "test-samurai.runners.js-mocha",
+      },
+    })
+
+    local fail_line = vim.json.encode({
+      event = "fail",
+      fullTitle = "API :: /brands... GET: /",
+    })
+    local start_line = vim.json.encode({ "start", { total = 1 } })
+    local end_line = vim.json.encode({ "end", { tests = 0 } })
+
+    local calls, orig_jobstart = stub_jobstart({
+      exit_codes = { 1, 1 },
+      stdout = { { fail_line }, { start_line, end_line } },
+    })
+
+    local bufnr = mkbuf("/tmp/project/brands.test.js", "javascript", {
+      'describe("API :: /brands...", function() {',
+      '  it("GET: /", function() {',
+      "    -- inside test",
+      "  })",
+      "})",
+    })
+
+    vim.api.nvim_set_current_buf(bufnr)
+    vim.api.nvim_win_set_cursor(0, { 3, 0 })
+
+    core.run_file()
+    core.run_failed_only()
+
+    local out_buf = vim.api.nvim_get_current_buf()
+    local lines = vim.api.nvim_buf_get_lines(out_buf, 0, -1, false)
+
+    vim.fn.jobstart = orig_jobstart
+
+    assert.equals(2, #calls)
+    assert.are.same(
+      { "npx", "mocha", "--reporter", "json-stream", "/tmp/project/brands.test.js" },
+      calls[1].cmd
+    )
+    local failed_cmd = calls[2].cmd or {}
+    local saw_grep = false
+    local saw_fgrep = false
+    local saw_title = false
+    local plain_title = "API :: /brands... GET: /"
+    for _, arg in ipairs(failed_cmd) do
+      if arg == "--grep" then
+        saw_grep = true
+      elseif arg == "--fgrep" then
+        saw_fgrep = true
+      elseif arg == plain_title then
+        saw_title = true
+      end
+    end
+    assert.is_false(saw_grep)
+    assert.is_true(saw_fgrep)
+    assert.is_true(saw_title)
+
+    local has_raw = false
+    for _, line in ipairs(lines) do
+      if line == start_line or line == end_line then
+        has_raw = true
+        break
+      end
+    end
+    assert.is_false(has_raw)
+  end)
+
   it("does not affect TSamLast history", function()
     local json = vim.json.encode({
       testResults = {