test(ui.panes): add test for panes lib

Author: boltlessengineer

spec/ui/panes_spec.lua

@@ -0,0 +1,71 @@
+---@module 'luassert'
+
+require("spec.minimum_init")
+
+local paneui = require("rest-nvim.ui.panes")
+local utils = require("rest-nvim.utils")
+
+---@type rest.ui.panes.PaneOpts[]
+local panes = {
+  {
+    name = "First",
+    render = function (self)
+      vim.b[self.bufnr].name = "first"
+      return true
+    end,
+  },
+  {
+    name = "Second",
+    render = function (self)
+      vim.b[self.bufnr].name = "second"
+    end,
+  },
+}
+
+local group = paneui.create_pane_group("test_panes_1", panes, {
+  on_init = function (self)
+    utils.nvim_lazy_set_wo(self.bufnr, "winbar", "this-is-a-winbar")
+  end,
+})
+
+describe("ui.panes", function ()
+  it("all panes are rendered", function ()
+    -- nothing happens before entering the pane
+    assert.not_same("first", vim.b.name)
+    assert.not_same("second", vim.b.name)
+    assert.not_same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+
+    -- enter the pane
+    group:enter(0)
+    assert.same("first", vim.b.name)
+    assert.same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+
+    -- cycle to second pane
+    group:cycle(1)
+    assert.same("second", vim.b.name)
+    assert.same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+
+    -- cycle back to first pane
+    group:cycle(3)
+    assert.same("first", vim.b.name)
+    assert.same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+
+    -- go back to original non-pane buffer
+    vim.cmd.buffer(1)
+    assert.not_same("first", vim.b.name)
+    assert.not_same("second", vim.b.name)
+    assert.not_same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+  end)
+  it("initialize the buffer back after unloaded", function ()
+    assert.same(1, vim.api.nvim_get_current_buf())
+    group:enter(0)
+    local pane_buf = vim.api.nvim_get_current_buf()
+    assert.not_same(1, pane_buf)
+    vim.cmd.bdelete()
+    assert.same(1, vim.api.nvim_get_current_buf())
+    group:enter(0)
+    assert.same(pane_buf, vim.api.nvim_get_current_buf())
+    assert.same("first", vim.b.name)
+    assert.same("this-is-a-winbar", vim.api.nvim_get_option_value("winbar", { scope = "local" }))
+  end)
+end)