fix(output_panel): recreate window and term channel if panel closed manually

lua/neotest/consumers/output_panel/init.lua

@@ -25,7 +25,12 @@ local init = function(client)
     if partial then
       return
     end
-    if not chan then
+
+    local channel_is_valid = function(chan_id)
+      return chan_id and pcall(vim.api.nvim_chan_send, chan_id, "\n")
+    end
+
+    if not channel_is_valid(chan) then
       chan = lib.ui.open_term(panel.win:buffer())
       -- neovim sometimes adds random blank lines when creating a terminal buffer
       nio.api.nvim_buf_set_option(panel.win:buffer(), "modifiable", true)
@@ -50,7 +55,11 @@ local init = function(client)
     for file, _ in pairs(files_to_read) do
       local output = lib.files.read(file)
       local dos_newlines = string.find(output, "\r\n") ~= nil
-      nio.api.nvim_chan_send(chan, dos_newlines and output or output:gsub("\n", "\r\n"))
+      if not pcall(nio.api.nvim_chan_send, chan, dos_newlines and output or output:gsub("\n", "\r\n")) then
+        lib.notify(("Error sending output to term channel: %s"):format(chan), vim.log.levels.ERROR)
+        chan = nil
+        break
+      end
     end
   end
 end

lua/neotest/lib/window.lua

@@ -61,10 +61,20 @@ function PersistentWindow:open()
 end
 
 function PersistentWindow:buffer()
-  if self._bufnr and vim.fn.bufexists(self._bufnr) == 1 then
+  if
+    self._bufnr
+    and nio.api.nvim_buf_is_valid(self._bufnr)
+    and nio.api.nvim_buf_is_loaded(self._bufnr)
+  then
     return self._bufnr
   end
 
+  for _, bufnr in ipairs(nio.api.nvim_list_bufs()) do
+    if nio.api.nvim_buf_get_name(bufnr):find(self.name, 1, true) then
+      nio.api.nvim_buf_delete(bufnr, { force = true })
+    end
+  end
+
   self._bufnr = nio.api.nvim_create_buf(false, true)
   nio.api.nvim_buf_set_name(self._bufnr, self.name)
   for k, v in pairs(self._bufopts) do

tests/unit/consumers/output_panel_spec.lua

@@ -0,0 +1,192 @@
+local neotest = require("neotest")
+
+local nio = require("nio")
+local a = nio.tests
+
+local stub = require("luassert.stub")
+local Tree = require("neotest.types").Tree
+local lib = require("neotest.lib")
+
+local NeotestClient = require("neotest.client")
+local AdapterGroup = require("neotest.adapters")
+
+describe("neotest consumer - output_panel", function()
+  ---@type neotest.Client
+  local client
+
+  ---@type neotest.Adapter
+  local mock_adapter
+  local mock_strategy
+  local exit_future_1, exit_future_2
+
+  local dir = vim.loop.cwd()
+  local files
+  local dirs = { dir }
+  local notify
+  local notify_msg = ''
+
+  ---@return neotest.Tree
+  local get_pos = function(...)
+    ---@diagnostic disable-next-line
+    return client:get_position(...)
+  end
+
+  before_each(function()
+    dirs = { dir }
+    files = { dir .. "/test_file_1", dir .. "/test_file_2" }
+
+    notify = function(message, level)
+      notify_msg = message
+    end
+
+    stub(lib, "notify", notify)
+    stub(lib.files, "find", files)
+    stub(lib.files, "read", "Test results - passed and failed\r\n")
+    stub(lib.files, "is_dir", function(path)
+      return vim.tbl_contains(dirs, path)
+    end)
+    stub(lib.files, "exists", function(path)
+      return path ~= ""
+    end)
+
+    exit_future_1, exit_future_2 = nio.control.future(), nio.control.future()
+
+    ---@diagnostic disable-next-line: missing-fields
+    mock_adapter = {
+      name = "adapter",
+
+      is_test_file = function(file_path)
+        return file_path ~= "" and not vim.endswith(file_path, lib.files.sep)
+      end,
+
+      root = function()
+        return dir
+      end,
+
+      discover_positions = function(file_path)
+        return Tree.from_list({
+          { id = file_path, type = "file", path = file_path, name = file_path },
+          {
+            {
+              id = file_path .. "::namespace",
+              type = "namespace",
+              path = file_path,
+              name = "namespace",
+              range = { 5, 0, 50, 0 },
+            },
+            {
+              id = file_path .. "::test_a",
+              type = "test",
+              path = file_path,
+              name = "test_a",
+              range = { 10, 0, 20, 50 },
+            },
+          },
+        }, function(pos)
+          return pos.id
+        end)
+      end,
+
+      build_spec = function()
+        return { strategy = { output = "not_a_file" } }
+      end,
+
+      results = function(_, _, tree)
+        return {}
+      end,
+    }
+
+    mock_strategy = function(spec)
+      return {
+        is_complete = function()
+          return true
+        end,
+
+        output = function()
+          return type(spec.strategy) == "table" and spec.strategy.output or "not_a_file"
+        end,
+
+        stop = function()
+          exit_future_1.set()
+          exit_future_2.set()
+        end,
+
+        result = function()
+          if not exit_future_1.is_set() then
+            exit_future_1.wait()
+          else
+            exit_future_2.wait()
+          end
+          return type(spec.strategy) == "table" and spec.strategy.exit_code or 0
+        end,
+      }
+    end
+
+    client = NeotestClient(AdapterGroup())
+    ---@diagnostic disable-next-line
+    neotest.setup({ adapters = { mock_adapter }, output_panel = { enabled = true } })
+
+    require("neotest.consumers.output_panel")(client)
+    ---@diagnostic disable-next-line
+    client.listeners.results = { output_panel = client.listeners.results }
+  end)
+
+  after_each(function()
+    lib.files.find:revert()
+    for _, buf in ipairs(vim.api.nvim_list_bufs()) do
+      vim.api.nvim_buf_delete(buf, { force = true })
+    end
+    notify_msg = ''
+  end)
+
+  describe("user forcefully closes the panel", function()
+    local panel_bufnr = function()
+      return vim.tbl_filter(function(bufnr)
+        return nio.api.nvim_buf_get_name(bufnr):match("Neotest Output Panel")
+      end, nio.api.nvim_list_bufs())[1]
+    end
+
+    before_each(function()
+      neotest.output_panel.open()
+    end)
+
+    a.it("recreates terminal session if term channel is invalid", function()
+      local tree = get_pos(dir .. "/test_file_1")
+
+      nio.run(function()
+        client:run_tree(tree, { strategy = mock_strategy })
+      end)
+      exit_future_1.set()
+
+      nio.api.nvim_buf_delete(panel_bufnr(), { force = true })
+      neotest.output_panel.open()
+
+      nio.run(function()
+        assert.has_no_error(function()
+          client:run_tree(tree, { strategy = mock_strategy })
+        end)
+        assert.is_not.matches('Error sending output to term channel:', notify_msg)
+      end)
+      exit_future_2.set()
+    end)
+
+    it("recreates panel buffer if it was closed", function()
+      vim.api.nvim_buf_delete(panel_bufnr(), { force = true })
+
+      assert.has_no_error(function()
+        neotest.output_panel.open()
+      end)
+    end)
+
+    it("deletes panel buffer if it already exists with the same name", function()
+      vim.api.nvim_buf_delete(panel_bufnr(), { force = true })
+
+      local buf = vim.api.nvim_create_buf(true, false)
+      vim.api.nvim_buf_set_name(buf, "Neotest Output Panel")
+
+      assert.has_no_error(function()
+        neotest.output_panel.open()
+      end)
+    end)
+  end)
+end)