add TSamLast command for reexecuting last running tests

tests/test_samurai_last_spec.lua

@@ -0,0 +1,126 @@
+local test_samurai = require("test-samurai")
+local core = require("test-samurai.core")
+
+local function mkbuf(path, ft, lines)
+  local bufnr = vim.api.nvim_create_buf(false, true)
+  vim.api.nvim_buf_set_name(bufnr, path)
+  vim.bo[bufnr].filetype = ft
+  if lines then
+    vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
+  end
+  return bufnr
+end
+
+local function capture_jobstart()
+  local calls = {}
+  local orig = vim.fn.jobstart
+  vim.fn.jobstart = function(cmd, opts)
+    table.insert(calls, { cmd = cmd, opts = opts })
+    return 1
+  end
+  return calls, orig
+end
+
+describe("TSamLast", function()
+  before_each(function()
+    test_samurai.setup()
+  end)
+
+  it("reruns last Go command", function()
+    local calls, orig_jobstart = capture_jobstart()
+
+    local bufnr = mkbuf("/tmp/project/foo_test.go", "go", {
+      "package main",
+      "import \"testing\"",
+      "",
+      "func TestFoo(t *testing.T) {",
+      "  t.Run(\"first\", func(t *testing.T) {",
+      "    -- inside first",
+      "  })",
+      "}",
+    })
+
+    vim.api.nvim_set_current_buf(bufnr)
+    vim.api.nvim_win_set_cursor(0, { 6, 0 })
+
+    core.run_nearest()
+    core.run_last()
+
+    vim.fn.jobstart = orig_jobstart
+
+    assert.equals(2, #calls)
+    assert.are.same({ "go", "test", "-v", "./", "-run", "^TestFoo/first$" }, calls[1].cmd)
+    assert.are.same(calls[1].cmd, calls[2].cmd)
+    assert.equals(calls[1].opts.cwd, calls[2].opts.cwd)
+  end)
+
+  it("reruns last JS command", function()
+    local calls, orig_jobstart = capture_jobstart()
+
+    local bufnr = mkbuf("/tmp/project/foo_last.test.ts", "typescript", {
+      'describe("outer", function() {',
+      '  it("inner 1", function() {',
+      "    -- inside 1",
+      "  })",
+      "",
+      '  it("inner 2", function() {',
+      "    -- inside 2",
+      "  })",
+      "})",
+    })
+
+    vim.api.nvim_set_current_buf(bufnr)
+    vim.api.nvim_win_set_cursor(0, { 7, 0 })
+
+    core.run_nearest()
+    core.run_last()
+
+    vim.fn.jobstart = orig_jobstart
+
+    assert.equals(2, #calls)
+    assert.are.same(
+      { "npx", "jest", "/tmp/project/foo_last.test.ts", "-t", "inner 2" },
+      calls[1].cmd
+    )
+    assert.are.same(calls[1].cmd, calls[2].cmd)
+    assert.equals(calls[1].opts.cwd, calls[2].opts.cwd)
+  end)
+
+  it("reruns last Lua command", function()
+    local calls, orig_jobstart = capture_jobstart()
+
+    local bufnr = mkbuf("/tmp/project/foo_last_spec.lua", "lua", {
+      "describe('outer', function()",
+      "  it('inner 1', function()",
+      "    local x = 1",
+      "  end)",
+      "",
+      "  it('inner 2', function()",
+      "    local y = 2",
+      "  end)",
+      "end)",
+    })
+
+    vim.api.nvim_set_current_buf(bufnr)
+    vim.api.nvim_win_set_cursor(0, { 7, 0 })
+
+    core.run_nearest()
+    core.run_last()
+
+    vim.fn.jobstart = orig_jobstart
+
+    assert.equals(2, #calls)
+    assert.are.same({
+      "nvim",
+      "--headless",
+      "-u",
+      "/tmp/project/tests/minimal_init.lua",
+      "-c",
+      'PlenaryBustedFile /tmp/project/foo_last_spec.lua { busted_args = { "--filter", "inner 2" } }',
+      "-c",
+      "qa",
+    }, calls[1].cmd)
+    assert.are.same(calls[1].cmd, calls[2].cmd)
+    assert.equals(calls[1].opts.cwd, calls[2].opts.cwd)
+  end)
+end)