code.delx.au - gnu-emacs-elpa/blob - company-tests.el

   1 ;;; company-tests.el --- company-mode tests  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2011, 2013-2014  Free Software Foundation, Inc.
   4
   5 ;; Author: Nikolaj Schumacher
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22
  23 ;;; Commentary:
  24 ;;
  25
  26 ;;; Code:
  27
  28 (require 'ert)
  29 (require 'company)
  30 (require 'company-keywords)
  31 (require 'company-clang)
  32
  33 ;;; Core
  34
  35 (ert-deftest company-sorted-keywords ()
  36   "Test that keywords in `company-keywords-alist' are in alphabetical order."
  37   (dolist (pair company-keywords-alist)
  38     (when (consp (cdr pair))
  39       (let ((prev (cadr pair)))
  40         (dolist (next (cddr pair))
  41           (should (not (equal prev next)))
  42           (should (string< prev next))
  43           (setq prev next))))))
  44
  45 (ert-deftest company-good-prefix ()
  46   (let ((company-minimum-prefix-length 5)
  47         company-abort-manual-when-too-short
  48         company--manual-action            ;idle begin
  49         (company-selection-changed t))    ;has no effect
  50     (should (eq t (company--good-prefix-p "!@#$%")))
  51     (should (eq nil (company--good-prefix-p "abcd")))
  52     (should (eq nil (company--good-prefix-p 'stop)))
  53     (should (eq t (company--good-prefix-p '("foo" . 5))))
  54     (should (eq nil (company--good-prefix-p '("foo" . 4))))
  55     (should (eq t (company--good-prefix-p '("foo" . t))))))
  56
  57 (ert-deftest company--manual-prefix-set-and-unset ()
  58   (with-temp-buffer
  59     (insert "ab")
  60     (company-mode)
  61     (let (company-frontends
  62           (company-backends
  63            (list (lambda (command &optional arg)
  64                    (cl-case command
  65                      (prefix (buffer-substring (point-min) (point)))
  66                      (candidates '("abc" "abd")))))))
  67       (company-manual-begin)
  68       (should (equal "ab" company--manual-prefix))
  69       (company-abort)
  70       (should (null company--manual-prefix)))))
  71
  72 (ert-deftest company-abort-manual-when-too-short ()
  73   (let ((company-minimum-prefix-length 5)
  74         (company-abort-manual-when-too-short t)
  75         (company-selection-changed t))    ;has not effect
  76     (let ((company--manual-action nil))   ;idle begin
  77       (should (eq t (company--good-prefix-p "!@#$%")))
  78       (should (eq t (company--good-prefix-p '("foo" . 5))))
  79       (should (eq t (company--good-prefix-p '("foo" . t)))))
  80     (let ((company--manual-action t)
  81           (company--manual-prefix "abc")) ;manual begin from this prefix
  82       (should (eq t (company--good-prefix-p "!@#$")))
  83       (should (eq nil (company--good-prefix-p "ab")))
  84       (should (eq nil (company--good-prefix-p 'stop)))
  85       (should (eq t (company--good-prefix-p '("foo" . 4))))
  86       (should (eq t (company--good-prefix-p "abcd")))
  87       (should (eq t (company--good-prefix-p "abc")))
  88       (should (eq t (company--good-prefix-p '("bar" . t)))))))
  89
  90 (ert-deftest company-multi-backend-with-lambdas ()
  91   (let ((company-backend
  92          (list (lambda (command &optional arg &rest ignore)
  93                  (cl-case command
  94                    (prefix "z")
  95                    (candidates '("a" "b"))))
  96                (lambda (command &optional arg &rest ignore)
  97                  (cl-case command
  98                    (prefix "z")
  99                    (candidates '("c" "d")))))))
 100     (should (equal (company-call-backend 'candidates "z") '("a" "b" "c" "d")))))
 101
 102 (ert-deftest company-multi-backend-filters-backends-by-prefix ()
 103   (let ((company-backend
 104          (list (lambda (command &optional arg &rest ignore)
 105                  (cl-case command
 106                    (prefix (cons "z" t))
 107                    (candidates '("a" "b"))))
 108                (lambda (command &optional arg &rest ignore)
 109                  (cl-case command
 110                    (prefix "t")
 111                    (candidates '("c" "d"))))
 112                (lambda (command &optional arg &rest ignore)
 113                  (cl-case command
 114                    (prefix "z")
 115                    (candidates '("e" "f")))))))
 116     (should (equal (company-call-backend 'candidates "z") '("a" "b" "e" "f")))))
 117
 118 (ert-deftest company-multi-backend-remembers-candidate-backend ()
 119   (let ((company-backend
 120          (list (lambda (command &optional arg)
 121                  (cl-case command
 122                    (ignore-case nil)
 123                    (annotation "1")
 124                    (candidates '("a" "c"))
 125                    (post-completion "13")))
 126                (lambda (command &optional arg)
 127                  (cl-case command
 128                    (ignore-case t)
 129                    (annotation "2")
 130                    (candidates '("b" "d"))
 131                    (post-completion "42")))
 132                (lambda (command &optional arg)
 133                  (cl-case command
 134                    (annotation "3")
 135                    (candidates '("e"))
 136                    (post-completion "74"))))))
 137     (let ((candidates (company-calculate-candidates nil)))
 138       (should (equal candidates '("a" "b" "c" "d" "e")))
 139       (should (equal t (company-call-backend 'ignore-case)))
 140       (should (equal "1" (company-call-backend 'annotation (nth 0 candidates))))
 141       (should (equal "2" (company-call-backend 'annotation (nth 1 candidates))))
 142       (should (equal "13" (company-call-backend 'post-completion (nth 2 candidates))))
 143       (should (equal "42" (company-call-backend 'post-completion (nth 3 candidates))))
 144       (should (equal "3" (company-call-backend 'annotation (nth 4 candidates))))
 145       (should (equal "74" (company-call-backend 'post-completion (nth 4 candidates)))))))
 146
 147 (ert-deftest company-multi-backend-handles-keyword-with ()
 148   (let ((primo (lambda (command &optional arg)
 149                  (cl-case command
 150                    (prefix "a")
 151                    (candidates '("abb" "abc" "abd")))))
 152         (secundo (lambda (command &optional arg)
 153                    (cl-case command
 154                      (prefix "a")
 155                      (candidates '("acc" "acd"))))))
 156     (let ((company-backend (list 'ignore 'ignore :with secundo)))
 157       (should (null (company-call-backend 'prefix))))
 158     (let ((company-backend (list 'ignore primo :with secundo)))
 159       (should (equal "a" (company-call-backend 'prefix)))
 160       (should (equal '("abb" "abc" "abd" "acc" "acd")
 161                      (company-call-backend 'candidates "a"))))))
 162
 163 (ert-deftest company-begin-backend-failure-doesnt-break-company-backends ()
 164   (with-temp-buffer
 165     (insert "a")
 166     (company-mode)
 167     (should-error
 168      (company-begin-backend (lambda (command &rest ignore))))
 169     (let (company-frontends
 170           (company-backends
 171            (list (lambda (command &optional arg)
 172                    (cl-case command
 173                      (prefix "a")
 174                      (candidates '("a" "ab" "ac")))))))
 175       (let (this-command)
 176         (company-call 'complete))
 177       (should (eq 3 company-candidates-length)))))
 178
 179 (ert-deftest company-require-match-explicit ()
 180   (with-temp-buffer
 181     (insert "ab")
 182     (company-mode)
 183     (let (company-frontends
 184           (company-require-match 'company-explicit-action-p)
 185           (company-backends
 186            (list (lambda (command &optional arg)
 187                    (cl-case command
 188                      (prefix (buffer-substring (point-min) (point)))
 189                      (candidates '("abc" "abd")))))))
 190       (let (this-command)
 191         (company-complete))
 192       (let ((last-command-event ?e))
 193         (company-call 'self-insert-command 1))
 194       (should (eq 2 company-candidates-length))
 195       (should (eq 3 (point))))))
 196
 197 (ert-deftest company-dont-require-match-when-idle ()
 198   (with-temp-buffer
 199     (insert "ab")
 200     (company-mode)
 201     (let (company-frontends
 202           (company-require-match 'company-explicit-action-p)
 203           (company-backends
 204            (list (lambda (command &optional arg)
 205                    (cl-case command
 206                      (prefix (buffer-substring (point-min) (point)))
 207                      (candidates '("abc" "abd")))))))
 208       (company-idle-begin (current-buffer) (selected-window)
 209                           (buffer-chars-modified-tick) (point))
 210       (let ((last-command-event ?e))
 211         (company-call 'self-insert-command 1))
 212       (should (eq nil company-candidates-length))
 213       (should (eq 4 (point))))))
 214
 215 (ert-deftest company-should-complete-whitelist ()
 216   (with-temp-buffer
 217     (insert "ab")
 218     (company-mode)
 219     (let (company-frontends
 220           company-begin-commands
 221           (company-backends
 222            (list (lambda (command &optional arg)
 223                    (cl-case command
 224                      (prefix (buffer-substring (point-min) (point)))
 225                      (candidates '("abc" "abd")))))))
 226       (let ((company-continue-commands nil))
 227         (let (this-command)
 228           (company-complete))
 229         (company-call 'backward-delete-char 1)
 230         (should (null company-candidates-length)))
 231       (let ((company-continue-commands '(backward-delete-char)))
 232         (let (this-command)
 233           (company-complete))
 234         (company-call 'backward-delete-char 1)
 235         (should (eq 2 company-candidates-length))))))
 236
 237 (ert-deftest company-should-complete-blacklist ()
 238   (with-temp-buffer
 239     (insert "ab")
 240     (company-mode)
 241     (let (company-frontends
 242           company-begin-commands
 243           (company-backends
 244            (list (lambda (command &optional arg)
 245                    (cl-case command
 246                      (prefix (buffer-substring (point-min) (point)))
 247                      (candidates '("abc" "abd")))))))
 248       (let ((company-continue-commands '(not backward-delete-char)))
 249         (let (this-command)
 250           (company-complete))
 251         (company-call 'backward-delete-char 1)
 252         (should (null company-candidates-length)))
 253       (let ((company-continue-commands '(not backward-delete-char-untabify)))
 254         (let (this-command)
 255           (company-complete))
 256         (company-call 'backward-delete-char 1)
 257         (should (eq 2 company-candidates-length))))))
 258
 259 (ert-deftest company-auto-complete-explicit ()
 260   (with-temp-buffer
 261     (insert "ab")
 262     (company-mode)
 263     (let (company-frontends
 264           (company-auto-complete 'company-explicit-action-p)
 265           (company-auto-complete-chars '(? ))
 266           (company-backends
 267            (list (lambda (command &optional arg)
 268                    (cl-case command
 269                      (prefix (buffer-substring (point-min) (point)))
 270                      (candidates '("abcd" "abef")))))))
 271       (let (this-command)
 272         (company-complete))
 273       (let ((last-command-event ? ))
 274         (company-call 'self-insert-command 1))
 275       (should (string= "abcd " (buffer-string))))))
 276
 277 (ert-deftest company-no-auto-complete-when-idle ()
 278   (with-temp-buffer
 279     (insert "ab")
 280     (company-mode)
 281     (let (company-frontends
 282           (company-auto-complete 'company-explicit-action-p)
 283           (company-auto-complete-chars '(? ))
 284           (company-backends
 285            (list (lambda (command &optional arg)
 286                    (cl-case command
 287                      (prefix (buffer-substring (point-min) (point)))
 288                      (candidates '("abcd" "abef")))))))
 289       (company-idle-begin (current-buffer) (selected-window)
 290                           (buffer-chars-modified-tick) (point))
 291       (let ((last-command-event ? ))
 292         (company-call 'self-insert-command 1))
 293       (should (string= "ab " (buffer-string))))))
 294
 295 (ert-deftest company-clears-explicit-action-when-no-matches ()
 296   (with-temp-buffer
 297     (company-mode)
 298     (let (company-frontends
 299           company-backends)
 300       (company-call 'manual-begin) ;; fails
 301       (should (null company-candidates))
 302       (should (null (company-explicit-action-p))))))
 303
 304 (ert-deftest company-ignore-case-replaces-prefix ()
 305   (with-temp-buffer
 306     (company-mode)
 307     (let (company-frontends
 308           company-end-of-buffer-workaround
 309           (company-backends
 310            (list (lambda (command &optional arg)
 311                    (cl-case command
 312                      (prefix (buffer-substring (point-min) (point)))
 313                      (candidates '("abcd" "abef"))
 314                      (ignore-case t))))))
 315       (insert "A")
 316       (let (this-command)
 317         (company-complete))
 318       (should (string= "ab" (buffer-string)))
 319       (delete-char -2)
 320       (insert "A") ; hack, to keep it in one test
 321       (company-complete-selection)
 322       (should (string= "abcd" (buffer-string))))))
 323
 324 (ert-deftest company-ignore-case-with-keep-prefix ()
 325   (with-temp-buffer
 326     (insert "AB")
 327     (company-mode)
 328     (let (company-frontends
 329           (company-backends
 330            (list (lambda (command &optional arg)
 331                    (cl-case command
 332                      (prefix (buffer-substring (point-min) (point)))
 333                      (candidates '("abcd" "abef"))
 334                      (ignore-case 'keep-prefix))))))
 335       (let (this-command)
 336         (company-complete))
 337       (company-complete-selection)
 338       (should (string= "ABcd" (buffer-string))))))
 339
 340 (ert-deftest company-non-prefix-completion ()
 341   (with-temp-buffer
 342     (insert "tc")
 343     (company-mode)
 344     (let (company-frontends
 345           company-end-of-buffer-workaround
 346           (company-backends
 347            (list (lambda (command &optional arg)
 348                    (cl-case command
 349                      (prefix (buffer-substring (point-min) (point)))
 350                      (candidates '("tea-cup" "teal-color")))))))
 351       (let (this-command)
 352         (company-complete))
 353       (should (string= "tc" (buffer-string)))
 354       (company-complete-selection)
 355       (should (string= "tea-cup" (buffer-string))))))
 356
 357 (ert-deftest company-pseudo-tooltip-does-not-get-displaced ()
 358   :tags '(interactive)
 359   (with-temp-buffer
 360     (save-window-excursion
 361       (set-window-buffer nil (current-buffer))
 362       (save-excursion (insert " ff"))
 363       (company-mode)
 364       (let ((company-frontends '(company-pseudo-tooltip-frontend))
 365             (company-begin-commands '(self-insert-command))
 366             (company-backends
 367              (list (lambda (c &optional arg)
 368                      (cl-case c (prefix "") (candidates '("a" "b" "c")))))))
 369         (let (this-command)
 370           (company-call 'complete))
 371         (company-call 'open-line 1)
 372         (should (eq 2 (overlay-start company-pseudo-tooltip-overlay)))))))
 373
 374 (ert-deftest company-pseudo-tooltip-show ()
 375   :tags '(interactive)
 376   (with-temp-buffer
 377     (save-window-excursion
 378     (set-window-buffer nil (current-buffer))
 379     (insert "aaaa\n  bb\nccccccc\nddd")
 380     (search-backward "bb")
 381     (let ((col (company--column))
 382           (company-candidates-length 2)
 383           (company-candidates '("123" "45"))
 384           (company-backend 'ignore))
 385       (company-pseudo-tooltip-show (company--row) col 0)
 386       (let ((ov company-pseudo-tooltip-overlay))
 387         ;; With margins.
 388         (should (eq (overlay-get ov 'company-width) 5))
 389         ;; FIXME: Make it 2?
 390         (should (eq (overlay-get ov 'company-height) company-tooltip-limit))
 391         (should (eq (overlay-get ov 'company-column) col))
 392         (should (string= (overlay-get ov 'company-after)
 393                          "  123 \nc 45  c\nddd\n")))))))
 394
 395 (ert-deftest company-preview-show-with-annotations ()
 396   :tags '(interactive)
 397   (with-temp-buffer
 398     (save-window-excursion
 399       (set-window-buffer nil (current-buffer))
 400       (save-excursion (insert "\n"))
 401       (let ((company-candidates-length 1)
 402             (company-candidates '("123")))
 403         (company-preview-show-at-point (point))
 404         (let ((ov company-preview-overlay))
 405           (should (string= (overlay-get ov 'display) "123\n")))))))
 406
 407 (ert-deftest company-pseudo-tooltip-show-with-annotations ()
 408   :tags '(interactive)
 409   (with-temp-buffer
 410     (save-window-excursion
 411       (set-window-buffer nil (current-buffer))
 412       (insert " ")
 413       (save-excursion (insert "\n"))
 414       (let ((company-candidates-length 2)
 415             (company-backend (lambda (action &optional arg &rest _ignore)
 416                                (when (eq action 'annotation)
 417                                  (cdr (assoc arg '(("123" . "(4)")))))))
 418             (company-candidates '("123" "45"))
 419             company-tooltip-align-annotations)
 420         (company-pseudo-tooltip-show-at-point (point))
 421         (let ((ov company-pseudo-tooltip-overlay))
 422           ;; With margins.
 423           (should (eq (overlay-get ov 'company-width) 8))
 424           (should (string= (overlay-get ov 'company-after)
 425                            " 123(4) \n 45     \n")))))))
 426
 427 (ert-deftest company-pseudo-tooltip-show-with-annotations-right-aligned ()
 428   :tags '(interactive)
 429   (with-temp-buffer
 430     (save-window-excursion
 431       (set-window-buffer nil (current-buffer))
 432       (insert " ")
 433       (save-excursion (insert "\n"))
 434       (let ((company-candidates-length 3)
 435             (company-backend (lambda (action &optional arg &rest _ignore)
 436                                (when (eq action 'annotation)
 437                                  (cdr (assoc arg '(("123" . "(4)")
 438                                                    ("67" . "(891011)")))))))
 439             (company-candidates '("123" "45" "67"))
 440             (company-tooltip-align-annotations t))
 441         (company-pseudo-tooltip-show-at-point (point))
 442         (let ((ov company-pseudo-tooltip-overlay))
 443           ;; With margins.
 444           (should (eq (overlay-get ov 'company-width) 13))
 445           (should (string= (overlay-get ov 'company-after)
 446                            " 123     (4) \n 45          \n 67 (891011) \n")))))))
 447
 448 (ert-deftest company-create-lines-shows-numbers ()
 449   (let ((company-show-numbers t)
 450         (company-candidates '("x" "y" "z"))
 451         (company-candidates-length 3)
 452         (company-backend 'ignore))
 453     (should (equal '(" x 1 " " y 2 " " z 3 ")
 454                    (company--create-lines 0 999)))))
 455
 456 (ert-deftest company-create-lines-truncates-annotations ()
 457   (let* ((ww (company--window-width))
 458          (data `(("1" . "(123)")
 459                  ("2" . nil)
 460                  ("3" . ,(concat "(" (make-string (- ww 2) ?4) ")"))
 461                  (,(make-string ww ?4) . "<4>")))
 462          (company-candidates (mapcar #'car data))
 463          (company-candidates-length 4)
 464          (company-tooltip-margin 1)
 465          (company-backend (lambda (cmd &optional arg)
 466                             (when (eq cmd 'annotation)
 467                               (cdr (assoc arg data)))))
 468          company-tooltip-align-annotations)
 469     (should (equal (list (format " 1(123)%s " (company-space-string (- ww 8)))
 470                          (format " 2%s " (company-space-string (- ww 3)))
 471                          (format " 3(444%s " (make-string (- ww 7) ?4))
 472                          (format " %s " (make-string (- ww 2) ?4)))
 473                    (company--create-lines 0 999)))
 474     (let ((company-tooltip-align-annotations t))
 475       (should (equal (list (format " 1%s(123) " (company-space-string (- ww 8)))
 476                            (format " 2%s " (company-space-string (- ww 3)))
 477                            (format " 3 (444%s " (make-string (- ww 8) ?4))
 478                            (format " %s " (make-string (- ww 2) ?4)))
 479                      (company--create-lines 0 999))))))
 480
 481 (ert-deftest company-column-with-composition ()
 482   (with-temp-buffer
 483     (insert "lambda ()")
 484     (compose-region 1 (1+ (length "lambda")) "\\")
 485     (should (= (company--column) 4))))
 486
 487 (ert-deftest company-column-with-line-prefix ()
 488   (with-temp-buffer
 489     (insert "foo")
 490     (put-text-property (point-min) (point) 'line-prefix "  ")
 491     (should (= (company--column) 5))))
 492
 493 (ert-deftest company-column-wth-line-prefix-on-empty-line ()
 494   (with-temp-buffer
 495     (insert "\n")
 496     (forward-char -1)
 497     (put-text-property (point-min) (point-max) 'line-prefix "  ")
 498     (should (= (company--column) 2))))
 499
 500 (ert-deftest company-plainify ()
 501   (let ((tab-width 8))
 502     (should (equal-including-properties
 503              (company-plainify "\tabc\td\t")
 504              (concat "        "
 505                      "abc     "
 506                      "d       "))))
 507   (should (equal-including-properties
 508            (company-plainify (propertize "foobar" 'line-prefix "-*-"))
 509            "-*-foobar")))
 510
 511 (ert-deftest company-modify-line ()
 512   (let ((str "-*-foobar"))
 513     (should (equal-including-properties
 514              (company-modify-line str "zz" 4)
 515              "-*-fzzbar"))
 516     (should (equal-including-properties
 517              (company-modify-line str "xx" 0)
 518              "xx-foobar"))
 519     (should (equal-including-properties
 520              (company-modify-line str "zz" 10)
 521              "-*-foobar zz"))))
 522
 523 (ert-deftest company-scrollbar-bounds ()
 524   (should (equal nil (company--scrollbar-bounds 0 3 3)))
 525   (should (equal nil (company--scrollbar-bounds 0 4 3)))
 526   (should (equal '(0 . 0) (company--scrollbar-bounds 0 1 2)))
 527   (should (equal '(1 . 1) (company--scrollbar-bounds 2 2 4)))
 528   (should (equal '(2 . 3) (company--scrollbar-bounds 7 4 12)))
 529   (should (equal '(1 . 2) (company--scrollbar-bounds 3 4 12)))
 530   (should (equal '(1 . 3) (company--scrollbar-bounds 4 5 11))))
 531
 532 ;;; Async
 533
 534 (defun company-async-backend (command &optional arg)
 535   (pcase command
 536     (`prefix "foo")
 537     (`candidates
 538      (cons :async
 539            (lambda (cb)
 540              (run-with-timer 0.05 nil
 541                              #'funcall cb '("abc" "abd")))))))
 542
 543 (ert-deftest company-call-backend-forces-sync ()
 544   (let ((company-backend 'company-async-backend)
 545         (company-async-timeout 0.1))
 546     (should (equal '("abc" "abd") (company-call-backend 'candidates)))))
 547
 548 (ert-deftest company-call-backend-errors-on-timeout ()
 549   (with-temp-buffer
 550     (let* ((company-backend (lambda (command &optional _arg)
 551                               (pcase command
 552                                 (`candidates (cons :async 'ignore)))))
 553            (company-async-timeout 0.1)
 554            (err (should-error (company-call-backend 'candidates "foo"))))
 555       (should (string-match-p "async timeout" (cadr err))))))
 556
 557 (ert-deftest company-call-backend-raw-passes-return-value-verbatim ()
 558   (let ((company-backend 'company-async-backend))
 559     (should (equal "foo" (company-call-backend-raw 'prefix)))
 560     (should (equal :async (car (company-call-backend-raw 'candidates "foo"))))
 561     (should (equal 'closure (cadr (company-call-backend-raw 'candidates "foo"))))))
 562
 563 (ert-deftest company-manual-begin-forces-async-candidates-to-sync ()
 564   (with-temp-buffer
 565     (company-mode)
 566     (let (company-frontends
 567           company-transformers
 568           (company-backends (list 'company-async-backend)))
 569       (company-manual-begin)
 570       (should (equal "foo" company-prefix))
 571       (should (equal '("abc" "abd") company-candidates)))))
 572
 573 (ert-deftest company-idle-begin-allows-async-candidates ()
 574   (with-temp-buffer
 575     (company-mode)
 576     (let (company-frontends
 577           company-transformers
 578           (company-backends (list 'company-async-backend)))
 579       (company-idle-begin (current-buffer) (selected-window)
 580                           (buffer-chars-modified-tick) (point))
 581       (should (null company-candidates))
 582       (sleep-for 0.1)
 583       (should (equal "foo" company-prefix))
 584       (should (equal '("abc" "abd") company-candidates)))))
 585
 586 (ert-deftest company-idle-begin-cancels-async-candidates-if-buffer-changed ()
 587   (with-temp-buffer
 588     (company-mode)
 589     (let (company-frontends
 590           (company-backends (list 'company-async-backend)))
 591       (company-idle-begin (current-buffer) (selected-window)
 592                           (buffer-chars-modified-tick) (point))
 593       (should (null company-candidates))
 594       (insert "a")
 595       (sleep-for 0.1)
 596       (should (null company-candidates)))))
 597
 598 (ert-deftest company-idle-begin-async-allows-immediate-callbacks ()
 599   (with-temp-buffer
 600     (company-mode)
 601     (let (company-frontends
 602           (company-backends
 603            (list (lambda (command &optional arg)
 604                    (pcase command
 605                      (`prefix (buffer-substring (point-min) (point)))
 606                      (`candidates
 607                       (let ((c (all-completions arg '("abc" "def"))))
 608                         (cons :async
 609                               (lambda (cb) (funcall cb c)))))
 610                      (`no-cache t)))))
 611           (company-minimum-prefix-length 0))
 612       (company-idle-begin (current-buffer) (selected-window)
 613                           (buffer-chars-modified-tick) (point))
 614       (should (equal '("abc" "def") company-candidates))
 615       (let ((last-command-event ?a))
 616         (company-call 'self-insert-command 1))
 617       (should (equal '("abc") company-candidates)))))
 618
 619 (ert-deftest company-multi-backend-forces-prefix-to-sync ()
 620   (with-temp-buffer
 621     (let ((company-backend (list 'ignore
 622                                  (lambda (command)
 623                                    (should (eq command 'prefix))
 624                                    (cons :async
 625                                          (lambda (cb)
 626                                            (run-with-timer
 627                                             0.01 nil
 628                                             (lambda () (funcall cb nil))))))
 629                                  (lambda (command)
 630                                    (should (eq command 'prefix))
 631                                    "foo"))))
 632       (should (equal "foo" (company-call-backend-raw 'prefix))))
 633     (let ((company-backend (list (lambda (_command)
 634                                    (cons :async
 635                                          (lambda (cb)
 636                                            (run-with-timer
 637                                             0.01 nil
 638                                             (lambda () (funcall cb "bar"))))))
 639                                  (lambda (_command)
 640                                    "foo"))))
 641       (should (equal "bar" (company-call-backend-raw 'prefix))))))
 642
 643 (ert-deftest company-multi-backend-merges-deferred-candidates ()
 644   (with-temp-buffer
 645     (let* ((immediate (lambda (command &optional arg)
 646                         (pcase command
 647                           (`prefix "foo")
 648                           (`candidates
 649                            (cons :async
 650                                  (lambda (cb) (funcall cb '("f"))))))))
 651            (company-backend (list 'ignore
 652                                   (lambda (command &optional arg)
 653                                     (pcase command
 654                                       (`prefix "foo")
 655                                       (`candidates
 656                                        (should (equal arg "foo"))
 657                                        (cons :async
 658                                              (lambda (cb)
 659                                                (run-with-timer
 660                                                 0.01 nil
 661                                                 (lambda () (funcall cb '("a" "b")))))))))
 662                                   (lambda (command &optional arg)
 663                                     (pcase command
 664                                       (`prefix "foo")
 665                                       (`candidates '("c" "d" "e"))))
 666                                   immediate)))
 667       (should (equal :async (car (company-call-backend-raw 'candidates "foo"))))
 668       (should (equal '("a" "b" "c" "d" "e" "f")
 669                      (company-call-backend 'candidates "foo")))
 670       (let ((company-backend (list immediate)))
 671         (should (equal '("f") (company-call-backend 'candidates "foo")))))))
 672
 673 ;;; Template
 674
 675 (ert-deftest company-template-removed-after-the-last-jump ()
 676   (with-temp-buffer
 677     (insert "{ }")
 678     (goto-char 2)
 679     (let ((tpl (company-template-declare-template (point) (1- (point-max)))))
 680       (save-excursion
 681         (dotimes (i 2)
 682           (insert " ")
 683           (company-template-add-field tpl (point) "foo")))
 684       (company-call 'template-forward-field)
 685       (should (= 3 (point)))
 686       (company-call 'template-forward-field)
 687       (should (= 7 (point)))
 688       (company-call 'template-forward-field)
 689       (should (= 11 (point)))
 690       (should (zerop (length (overlay-get tpl 'company-template-fields))))
 691       (should (null (overlay-buffer tpl))))))
 692
 693 (ert-deftest company-template-removed-after-input-and-jump ()
 694   (with-temp-buffer
 695     (insert "{ }")
 696     (goto-char 2)
 697     (let ((tpl (company-template-declare-template (point) (1- (point-max)))))
 698       (save-excursion
 699         (insert " ")
 700         (company-template-add-field tpl (point) "bar"))
 701       (company-call 'template-move-to-first tpl)
 702       (should (= 3 (point)))
 703       (dolist (c (string-to-list "tee"))
 704         (let ((last-command-event c))
 705           (company-call 'self-insert-command 1)))
 706       (should (string= "{ tee }" (buffer-string)))
 707       (should (overlay-buffer tpl))
 708       (company-call 'template-forward-field)
 709       (should (= 7 (point)))
 710       (should (null (overlay-buffer tpl))))))
 711
 712 (defun company-call (name &rest args)
 713   (let* ((maybe (intern (format "company-%s" name)))
 714          (command (if (fboundp maybe) maybe name)))
 715     (let ((this-command command))
 716       (run-hooks 'pre-command-hook))
 717     (apply command args)
 718     (let ((this-command command))
 719       (run-hooks 'post-command-hook))))
 720
 721 (ert-deftest company-template-c-like-templatify ()
 722   (with-temp-buffer
 723     (let ((text "foo(int a, short b)"))
 724       (insert text)
 725       (company-template-c-like-templatify text)
 726       (should (equal "foo(arg0, arg1)" (buffer-string)))
 727       (should (looking-at "arg0"))
 728       (should (equal "int a"
 729                      (overlay-get (company-template-field-at) 'display))))))
 730
 731 (ert-deftest company-template-c-like-templatify-trims-after-closing-paren ()
 732   (with-temp-buffer
 733     (let ((text "foo(int a, short b)!@ #1334 a"))
 734       (insert text)
 735       (company-template-c-like-templatify text)
 736       (should (equal "foo(arg0, arg1)" (buffer-string)))
 737       (should (looking-at "arg0")))))
 738
 739 ;;; Clang
 740
 741 (ert-deftest company-clang-objc-templatify ()
 742   (with-temp-buffer
 743     (let ((text "createBookWithTitle:andAuthor:"))
 744       (insert text)
 745       (company-clang-objc-templatify text)
 746       (should (equal "createBookWithTitle:arg0 andAuthor:arg1" (buffer-string)))
 747       (should (looking-at "arg0"))
 748       (should (null (overlay-get (company-template-field-at) 'display))))))