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-minimum-prefix-length 2)
 203           (company-require-match 'company-explicit-action-p)
 204           (company-backends
 205            (list (lambda (command &optional arg)
 206                    (cl-case command
 207                      (prefix (buffer-substring (point-min) (point)))
 208                      (candidates '("abc" "abd")))))))
 209       (company-idle-begin (current-buffer) (selected-window)
 210                           (buffer-chars-modified-tick) (point))
 211       (should (eq 2 company-candidates-length))
 212       (let ((last-command-event ?e))
 213         (company-call 'self-insert-command 1))
 214       (should (eq nil company-candidates-length))
 215       (should (eq 4 (point))))))
 216
 217 (ert-deftest company-dont-require-match-if-old-prefix-ended-and-was-a-match ()
 218   (with-temp-buffer
 219     (insert "ab")
 220     (company-mode)
 221     (let (company-frontends
 222           (company-require-match 'company-explicit-action-p)
 223           (company-backends
 224            (list (lambda (command &optional arg)
 225                    (cl-case command
 226                      (prefix (company-grab-word))
 227                      (candidates '("abc" "ab" "abd"))
 228                      (sorted t))))))
 229       (let (this-command)
 230         (company-complete))
 231       (let ((last-command-event ?e))
 232         (company-call 'self-insert-command 1))
 233       (should (eq 3 company-candidates-length))
 234       (should (eq 3 (point)))
 235       (let ((last-command-event ? ))
 236         (company-call 'self-insert-command 1))
 237       (should (null company-candidates-length))
 238       (should (eq 4 (point))))))
 239
 240 (ert-deftest company-should-complete-whitelist ()
 241   (with-temp-buffer
 242     (insert "ab")
 243     (company-mode)
 244     (let (company-frontends
 245           company-begin-commands
 246           (company-backends
 247            (list (lambda (command &optional arg)
 248                    (cl-case command
 249                      (prefix (buffer-substring (point-min) (point)))
 250                      (candidates '("abc" "abd")))))))
 251       (let ((company-continue-commands nil))
 252         (let (this-command)
 253           (company-complete))
 254         (company-call 'backward-delete-char 1)
 255         (should (null company-candidates-length)))
 256       (let ((company-continue-commands '(backward-delete-char)))
 257         (let (this-command)
 258           (company-complete))
 259         (company-call 'backward-delete-char 1)
 260         (should (eq 2 company-candidates-length))))))
 261
 262 (ert-deftest company-should-complete-blacklist ()
 263   (with-temp-buffer
 264     (insert "ab")
 265     (company-mode)
 266     (let (company-frontends
 267           company-begin-commands
 268           (company-backends
 269            (list (lambda (command &optional arg)
 270                    (cl-case command
 271                      (prefix (buffer-substring (point-min) (point)))
 272                      (candidates '("abc" "abd")))))))
 273       (let ((company-continue-commands '(not backward-delete-char)))
 274         (let (this-command)
 275           (company-complete))
 276         (company-call 'backward-delete-char 1)
 277         (should (null company-candidates-length)))
 278       (let ((company-continue-commands '(not backward-delete-char-untabify)))
 279         (let (this-command)
 280           (company-complete))
 281         (company-call 'backward-delete-char 1)
 282         (should (eq 2 company-candidates-length))))))
 283
 284 (ert-deftest company-auto-complete-explicit ()
 285   (with-temp-buffer
 286     (insert "ab")
 287     (company-mode)
 288     (let (company-frontends
 289           (company-auto-complete 'company-explicit-action-p)
 290           (company-auto-complete-chars '(? ))
 291           (company-backends
 292            (list (lambda (command &optional arg)
 293                    (cl-case command
 294                      (prefix (buffer-substring (point-min) (point)))
 295                      (candidates '("abcd" "abef")))))))
 296       (let (this-command)
 297         (company-complete))
 298       (let ((last-command-event ? ))
 299         (company-call 'self-insert-command 1))
 300       (should (string= "abcd " (buffer-string))))))
 301
 302 (ert-deftest company-no-auto-complete-when-idle ()
 303   (with-temp-buffer
 304     (insert "ab")
 305     (company-mode)
 306     (let (company-frontends
 307           (company-auto-complete 'company-explicit-action-p)
 308           (company-auto-complete-chars '(? ))
 309           (company-minimum-prefix-length 2)
 310           (company-backends
 311            (list (lambda (command &optional arg)
 312                    (cl-case command
 313                      (prefix (buffer-substring (point-min) (point)))
 314                      (candidates '("abcd" "abef")))))))
 315       (company-idle-begin (current-buffer) (selected-window)
 316                           (buffer-chars-modified-tick) (point))
 317       (let ((last-command-event ? ))
 318         (company-call 'self-insert-command 1))
 319       (should (string= "ab " (buffer-string))))))
 320
 321 (ert-deftest company-clears-explicit-action-when-no-matches ()
 322   (with-temp-buffer
 323     (company-mode)
 324     (let (company-frontends
 325           company-backends)
 326       (company-call 'manual-begin) ;; fails
 327       (should (null company-candidates))
 328       (should (null (company-explicit-action-p))))))
 329
 330 (ert-deftest company-ignore-case-replaces-prefix ()
 331   (with-temp-buffer
 332     (company-mode)
 333     (let (company-frontends
 334           company-end-of-buffer-workaround
 335           (company-backends
 336            (list (lambda (command &optional arg)
 337                    (cl-case command
 338                      (prefix (buffer-substring (point-min) (point)))
 339                      (candidates '("abcd" "abef"))
 340                      (ignore-case t))))))
 341       (insert "A")
 342       (let (this-command)
 343         (company-complete))
 344       (should (string= "ab" (buffer-string)))
 345       (delete-char -2)
 346       (insert "A") ; hack, to keep it in one test
 347       (company-complete-selection)
 348       (should (string= "abcd" (buffer-string))))))
 349
 350 (ert-deftest company-ignore-case-with-keep-prefix ()
 351   (with-temp-buffer
 352     (insert "AB")
 353     (company-mode)
 354     (let (company-frontends
 355           (company-backends
 356            (list (lambda (command &optional arg)
 357                    (cl-case command
 358                      (prefix (buffer-substring (point-min) (point)))
 359                      (candidates '("abcd" "abef"))
 360                      (ignore-case 'keep-prefix))))))
 361       (let (this-command)
 362         (company-complete))
 363       (company-complete-selection)
 364       (should (string= "ABcd" (buffer-string))))))
 365
 366 (ert-deftest company-non-prefix-completion ()
 367   (with-temp-buffer
 368     (insert "tc")
 369     (company-mode)
 370     (let (company-frontends
 371           company-end-of-buffer-workaround
 372           (company-backends
 373            (list (lambda (command &optional arg)
 374                    (cl-case command
 375                      (prefix (buffer-substring (point-min) (point)))
 376                      (candidates '("tea-cup" "teal-color")))))))
 377       (let (this-command)
 378         (company-complete))
 379       (should (string= "tc" (buffer-string)))
 380       (company-complete-selection)
 381       (should (string= "tea-cup" (buffer-string))))))
 382
 383 (ert-deftest company-pseudo-tooltip-does-not-get-displaced ()
 384   :tags '(interactive)
 385   (with-temp-buffer
 386     (save-window-excursion
 387       (set-window-buffer nil (current-buffer))
 388       (save-excursion (insert " ff"))
 389       (company-mode)
 390       (let ((company-frontends '(company-pseudo-tooltip-frontend))
 391             (company-begin-commands '(self-insert-command))
 392             (company-backends
 393              (list (lambda (c &optional arg)
 394                      (cl-case c (prefix "") (candidates '("a" "b" "c")))))))
 395         (let (this-command)
 396           (company-call 'complete))
 397         (company-call 'open-line 1)
 398         (should (eq 2 (overlay-start company-pseudo-tooltip-overlay)))))))
 399
 400 (ert-deftest company-pseudo-tooltip-show ()
 401   :tags '(interactive)
 402   (with-temp-buffer
 403     (save-window-excursion
 404     (set-window-buffer nil (current-buffer))
 405     (insert "aaaa\n  bb\nccccccc\nddd")
 406     (search-backward "bb")
 407     (let ((col (company--column))
 408           (company-candidates-length 2)
 409           (company-candidates '("123" "45"))
 410           (company-backend 'ignore))
 411       (company-pseudo-tooltip-show (company--row) col 0)
 412       (let ((ov company-pseudo-tooltip-overlay))
 413         ;; With margins.
 414         (should (eq (overlay-get ov 'company-width) 5))
 415         ;; FIXME: Make it 2?
 416         (should (eq (overlay-get ov 'company-height) company-tooltip-limit))
 417         (should (eq (overlay-get ov 'company-column) col))
 418         (should (string= (overlay-get ov 'company-after)
 419                          "  123 \nc 45  c\nddd\n")))))))
 420
 421 (ert-deftest company-pseudo-tooltip-edit-updates-width ()
 422   :tags '(interactive)
 423   (with-temp-buffer
 424     (set-window-buffer nil (current-buffer))
 425     (let ((company-candidates-length 5)
 426           (company-candidates '("123" "45" "67" "89" "1011"))
 427           (company-backend 'ignore)
 428           (company-tooltip-limit 4)
 429           (company-tooltip-offset-display 'scrollbar))
 430       (company-pseudo-tooltip-show (company--row)
 431                                    (company--column)
 432                                    0)
 433       (should (eq (overlay-get company-pseudo-tooltip-overlay 'company-width)
 434                   6))
 435       (company-pseudo-tooltip-edit 4)
 436       (should (eq (overlay-get company-pseudo-tooltip-overlay 'company-width)
 437                   7)))))
 438
 439 (ert-deftest company-preview-show-with-annotations ()
 440   :tags '(interactive)
 441   (with-temp-buffer
 442     (save-window-excursion
 443       (set-window-buffer nil (current-buffer))
 444       (save-excursion (insert "\n"))
 445       (let ((company-candidates-length 1)
 446             (company-candidates '("123")))
 447         (company-preview-show-at-point (point))
 448         (let ((ov company-preview-overlay))
 449           (should (string= (overlay-get ov 'display) "123\n")))))))
 450
 451 (ert-deftest company-pseudo-tooltip-show-with-annotations ()
 452   :tags '(interactive)
 453   (with-temp-buffer
 454     (save-window-excursion
 455       (set-window-buffer nil (current-buffer))
 456       (insert " ")
 457       (save-excursion (insert "\n"))
 458       (let ((company-candidates-length 2)
 459             (company-backend (lambda (action &optional arg &rest _ignore)
 460                                (when (eq action 'annotation)
 461                                  (cdr (assoc arg '(("123" . "(4)")))))))
 462             (company-candidates '("123" "45"))
 463             company-tooltip-align-annotations)
 464         (company-pseudo-tooltip-show-at-point (point) 0)
 465         (let ((ov company-pseudo-tooltip-overlay))
 466           ;; With margins.
 467           (should (eq (overlay-get ov 'company-width) 8))
 468           (should (string= (overlay-get ov 'company-after)
 469                            " 123(4) \n 45     \n")))))))
 470
 471 (ert-deftest company-pseudo-tooltip-show-with-annotations-right-aligned ()
 472   :tags '(interactive)
 473   (with-temp-buffer
 474     (save-window-excursion
 475       (set-window-buffer nil (current-buffer))
 476       (insert " ")
 477       (save-excursion (insert "\n"))
 478       (let ((company-candidates-length 3)
 479             (company-backend (lambda (action &optional arg &rest _ignore)
 480                                (when (eq action 'annotation)
 481                                  (cdr (assoc arg '(("123" . "(4)")
 482                                                    ("67" . "(891011)")))))))
 483             (company-candidates '("123" "45" "67"))
 484             (company-tooltip-align-annotations t))
 485         (company-pseudo-tooltip-show-at-point (point) 0)
 486         (let ((ov company-pseudo-tooltip-overlay))
 487           ;; With margins.
 488           (should (eq (overlay-get ov 'company-width) 13))
 489           (should (string= (overlay-get ov 'company-after)
 490                            " 123     (4) \n 45          \n 67 (891011) \n")))))))
 491
 492 (ert-deftest company-create-lines-shows-numbers ()
 493   (let ((company-show-numbers t)
 494         (company-candidates '("x" "y" "z"))
 495         (company-candidates-length 3)
 496         (company-backend 'ignore))
 497     (should (equal '(" x 1 " " y 2 " " z 3 ")
 498                    (company--create-lines 0 999)))))
 499
 500 (ert-deftest company-create-lines-truncates-annotations ()
 501   (let* ((ww (company--window-width))
 502          (data `(("1" . "(123)")
 503                  ("2" . nil)
 504                  ("3" . ,(concat "(" (make-string (- ww 2) ?4) ")"))
 505                  (,(make-string ww ?4) . "<4>")))
 506          (company-candidates (mapcar #'car data))
 507          (company-candidates-length 4)
 508          (company-tooltip-margin 1)
 509          (company-backend (lambda (cmd &optional arg)
 510                             (when (eq cmd 'annotation)
 511                               (cdr (assoc arg data)))))
 512          company-tooltip-align-annotations)
 513     (should (equal (list (format " 1(123)%s " (company-space-string (- ww 8)))
 514                          (format " 2%s " (company-space-string (- ww 3)))
 515                          (format " 3(444%s " (make-string (- ww 7) ?4))
 516                          (format " %s " (make-string (- ww 2) ?4)))
 517                    (company--create-lines 0 999)))
 518     (let ((company-tooltip-align-annotations t))
 519       (should (equal (list (format " 1%s(123) " (company-space-string (- ww 8)))
 520                            (format " 2%s " (company-space-string (- ww 3)))
 521                            (format " 3 (444%s " (make-string (- ww 8) ?4))
 522                            (format " %s " (make-string (- ww 2) ?4)))
 523                      (company--create-lines 0 999))))))
 524
 525 (ert-deftest company-column-with-composition ()
 526   (with-temp-buffer
 527     (insert "lambda ()")
 528     (compose-region 1 (1+ (length "lambda")) "\\")
 529     (should (= (company--column) 4))))
 530
 531 (ert-deftest company-column-with-line-prefix ()
 532   (with-temp-buffer
 533     (insert "foo")
 534     (put-text-property (point-min) (point) 'line-prefix "  ")
 535     (should (= (company--column) 5))))
 536
 537 (ert-deftest company-column-wth-line-prefix-on-empty-line ()
 538   (with-temp-buffer
 539     (insert "\n")
 540     (forward-char -1)
 541     (put-text-property (point-min) (point-max) 'line-prefix "  ")
 542     (should (= (company--column) 2))))
 543
 544 (ert-deftest company-plainify ()
 545   (let ((tab-width 8))
 546     (should (equal-including-properties
 547              (company-plainify "\tabc\td\t")
 548              (concat "        "
 549                      "abc     "
 550                      "d       "))))
 551   (should (equal-including-properties
 552            (company-plainify (propertize "foobar" 'line-prefix "-*-"))
 553            "-*-foobar")))
 554
 555 (ert-deftest company-modify-line ()
 556   (let ((str "-*-foobar"))
 557     (should (equal-including-properties
 558              (company-modify-line str "zz" 4)
 559              "-*-fzzbar"))
 560     (should (equal-including-properties
 561              (company-modify-line str "xx" 0)
 562              "xx-foobar"))
 563     (should (equal-including-properties
 564              (company-modify-line str "zz" 10)
 565              "-*-foobar zz"))))
 566
 567 (ert-deftest company-scrollbar-bounds ()
 568   (should (equal nil (company--scrollbar-bounds 0 3 3)))
 569   (should (equal nil (company--scrollbar-bounds 0 4 3)))
 570   (should (equal '(0 . 0) (company--scrollbar-bounds 0 1 2)))
 571   (should (equal '(1 . 1) (company--scrollbar-bounds 2 2 4)))
 572   (should (equal '(2 . 3) (company--scrollbar-bounds 7 4 12)))
 573   (should (equal '(1 . 2) (company--scrollbar-bounds 3 4 12)))
 574   (should (equal '(1 . 3) (company--scrollbar-bounds 4 5 11))))
 575
 576 ;;; Async
 577
 578 (defun company-async-backend (command &optional arg)
 579   (pcase command
 580     (`prefix "foo")
 581     (`candidates
 582      (cons :async
 583            (lambda (cb)
 584              (run-with-timer 0.05 nil
 585                              #'funcall cb '("abc" "abd")))))))
 586
 587 (ert-deftest company-call-backend-forces-sync ()
 588   (let ((company-backend 'company-async-backend)
 589         (company-async-timeout 0.1))
 590     (should (equal '("abc" "abd") (company-call-backend 'candidates)))))
 591
 592 (ert-deftest company-call-backend-errors-on-timeout ()
 593   (with-temp-buffer
 594     (let* ((company-backend (lambda (command &optional _arg)
 595                               (pcase command
 596                                 (`candidates (cons :async 'ignore)))))
 597            (company-async-timeout 0.1)
 598            (err (should-error (company-call-backend 'candidates "foo"))))
 599       (should (string-match-p "async timeout" (cadr err))))))
 600
 601 (ert-deftest company-call-backend-raw-passes-return-value-verbatim ()
 602   (let ((company-backend 'company-async-backend))
 603     (should (equal "foo" (company-call-backend-raw 'prefix)))
 604     (should (equal :async (car (company-call-backend-raw 'candidates "foo"))))
 605     (should (equal 'closure (cadr (company-call-backend-raw 'candidates "foo"))))))
 606
 607 (ert-deftest company-manual-begin-forces-async-candidates-to-sync ()
 608   (with-temp-buffer
 609     (company-mode)
 610     (let (company-frontends
 611           company-transformers
 612           (company-backends (list 'company-async-backend)))
 613       (company-manual-begin)
 614       (should (equal "foo" company-prefix))
 615       (should (equal '("abc" "abd") company-candidates)))))
 616
 617 (ert-deftest company-idle-begin-allows-async-candidates ()
 618   (with-temp-buffer
 619     (company-mode)
 620     (let (company-frontends
 621           company-transformers
 622           (company-backends (list 'company-async-backend)))
 623       (company-idle-begin (current-buffer) (selected-window)
 624                           (buffer-chars-modified-tick) (point))
 625       (should (null company-candidates))
 626       (sleep-for 0.1)
 627       (should (equal "foo" company-prefix))
 628       (should (equal '("abc" "abd") company-candidates)))))
 629
 630 (ert-deftest company-idle-begin-cancels-async-candidates-if-buffer-changed ()
 631   (with-temp-buffer
 632     (company-mode)
 633     (let (company-frontends
 634           (company-backends (list 'company-async-backend)))
 635       (company-idle-begin (current-buffer) (selected-window)
 636                           (buffer-chars-modified-tick) (point))
 637       (should (null company-candidates))
 638       (insert "a")
 639       (sleep-for 0.1)
 640       (should (null company-candidates)))))
 641
 642 (ert-deftest company-idle-begin-async-allows-immediate-callbacks ()
 643   (with-temp-buffer
 644     (company-mode)
 645     (let (company-frontends
 646           (company-backends
 647            (list (lambda (command &optional arg)
 648                    (pcase command
 649                      (`prefix (buffer-substring (point-min) (point)))
 650                      (`candidates
 651                       (let ((c (all-completions arg '("abc" "def"))))
 652                         (cons :async
 653                               (lambda (cb) (funcall cb c)))))
 654                      (`no-cache t)))))
 655           (company-minimum-prefix-length 0))
 656       (company-idle-begin (current-buffer) (selected-window)
 657                           (buffer-chars-modified-tick) (point))
 658       (should (equal '("abc" "def") company-candidates))
 659       (let ((last-command-event ?a))
 660         (company-call 'self-insert-command 1))
 661       (should (equal '("abc") company-candidates)))))
 662
 663 (ert-deftest company-multi-backend-forces-prefix-to-sync ()
 664   (with-temp-buffer
 665     (let ((company-backend (list 'ignore
 666                                  (lambda (command)
 667                                    (should (eq command 'prefix))
 668                                    (cons :async
 669                                          (lambda (cb)
 670                                            (run-with-timer
 671                                             0.01 nil
 672                                             (lambda () (funcall cb nil))))))
 673                                  (lambda (command)
 674                                    (should (eq command 'prefix))
 675                                    "foo"))))
 676       (should (equal "foo" (company-call-backend-raw 'prefix))))
 677     (let ((company-backend (list (lambda (_command)
 678                                    (cons :async
 679                                          (lambda (cb)
 680                                            (run-with-timer
 681                                             0.01 nil
 682                                             (lambda () (funcall cb "bar"))))))
 683                                  (lambda (_command)
 684                                    "foo"))))
 685       (should (equal "bar" (company-call-backend-raw 'prefix))))))
 686
 687 (ert-deftest company-multi-backend-merges-deferred-candidates ()
 688   (with-temp-buffer
 689     (let* ((immediate (lambda (command &optional arg)
 690                         (pcase command
 691                           (`prefix "foo")
 692                           (`candidates
 693                            (cons :async
 694                                  (lambda (cb) (funcall cb '("f"))))))))
 695            (company-backend (list 'ignore
 696                                   (lambda (command &optional arg)
 697                                     (pcase command
 698                                       (`prefix "foo")
 699                                       (`candidates
 700                                        (should (equal arg "foo"))
 701                                        (cons :async
 702                                              (lambda (cb)
 703                                                (run-with-timer
 704                                                 0.01 nil
 705                                                 (lambda () (funcall cb '("a" "b")))))))))
 706                                   (lambda (command &optional arg)
 707                                     (pcase command
 708                                       (`prefix "foo")
 709                                       (`candidates '("c" "d" "e"))))
 710                                   immediate)))
 711       (should (equal :async (car (company-call-backend-raw 'candidates "foo"))))
 712       (should (equal '("a" "b" "c" "d" "e" "f")
 713                      (company-call-backend 'candidates "foo")))
 714       (let ((company-backend (list immediate)))
 715         (should (equal '("f") (company-call-backend 'candidates "foo")))))))
 716
 717 ;;; Transformers
 718
 719 (ert-deftest company-occurrence-prefer-closest-above ()
 720   (with-temp-buffer
 721     (insert "foo0
 722 foo1
 723 ")
 724     (save-excursion
 725       (insert "
 726 foo3
 727 foo2"))
 728     (let ((company-backend 'company-dabbrev)
 729           (company-occurrence-weight-function
 730            'company-occurrence-prefer-closest-above))
 731       (should (equal '("foo1" "foo0" "foo3" "foo2" "foo4")
 732                      (company-sort-by-occurrence
 733                       '("foo0" "foo1" "foo2" "foo3" "foo4")))))))
 734
 735 (ert-deftest company-occurrence-prefer-any-closest ()
 736   (with-temp-buffer
 737     (insert "foo0
 738 foo1
 739 ")
 740     (save-excursion
 741       (insert "
 742 foo3
 743 foo2"))
 744     (let ((company-backend 'company-dabbrev)
 745           (company-occurrence-weight-function
 746            'company-occurrence-prefer-any-closest))
 747       (should (equal '("foo1" "foo3" "foo0" "foo2" "foo4")
 748                      (company-sort-by-occurrence
 749                       '("foo0" "foo1" "foo2" "foo3" "foo4")))))))
 750
 751 ;;; Template
 752
 753 (ert-deftest company-template-removed-after-the-last-jump ()
 754   (with-temp-buffer
 755     (insert "{ }")
 756     (goto-char 2)
 757     (let ((tpl (company-template-declare-template (point) (1- (point-max)))))
 758       (save-excursion
 759         (dotimes (i 2)
 760           (insert " ")
 761           (company-template-add-field tpl (point) "foo")))
 762       (company-call 'template-forward-field)
 763       (should (= 3 (point)))
 764       (company-call 'template-forward-field)
 765       (should (= 7 (point)))
 766       (company-call 'template-forward-field)
 767       (should (= 11 (point)))
 768       (should (zerop (length (overlay-get tpl 'company-template-fields))))
 769       (should (null (overlay-buffer tpl))))))
 770
 771 (ert-deftest company-template-removed-after-input-and-jump ()
 772   (with-temp-buffer
 773     (insert "{ }")
 774     (goto-char 2)
 775     (let ((tpl (company-template-declare-template (point) (1- (point-max)))))
 776       (save-excursion
 777         (insert " ")
 778         (company-template-add-field tpl (point) "bar"))
 779       (company-call 'template-move-to-first tpl)
 780       (should (= 3 (point)))
 781       (dolist (c (string-to-list "tee"))
 782         (let ((last-command-event c))
 783           (company-call 'self-insert-command 1)))
 784       (should (string= "{ tee }" (buffer-string)))
 785       (should (overlay-buffer tpl))
 786       (company-call 'template-forward-field)
 787       (should (= 7 (point)))
 788       (should (null (overlay-buffer tpl))))))
 789
 790 (defun company-call (name &rest args)
 791   (let* ((maybe (intern (format "company-%s" name)))
 792          (command (if (fboundp maybe) maybe name)))
 793     (let ((this-command command))
 794       (run-hooks 'pre-command-hook))
 795     (apply command args)
 796     (let ((this-command command))
 797       (run-hooks 'post-command-hook))))
 798
 799 (ert-deftest company-template-c-like-templatify ()
 800   (with-temp-buffer
 801     (let ((text "foo(int a, short b)"))
 802       (insert text)
 803       (company-template-c-like-templatify text)
 804       (should (equal "foo(arg0, arg1)" (buffer-string)))
 805       (should (looking-at "arg0"))
 806       (should (equal "int a"
 807                      (overlay-get (company-template-field-at) 'display))))))
 808
 809 (ert-deftest company-template-c-like-templatify-trims-after-closing-paren ()
 810   (with-temp-buffer
 811     (let ((text "foo(int a, short b)!@ #1334 a"))
 812       (insert text)
 813       (company-template-c-like-templatify text)
 814       (should (equal "foo(arg0, arg1)" (buffer-string)))
 815       (should (looking-at "arg0")))))
 816
 817 ;;; Clang
 818
 819 (ert-deftest company-clang-objc-templatify ()
 820   (with-temp-buffer
 821     (let ((text "createBookWithTitle:andAuthor:"))
 822       (insert text)
 823       (company-clang-objc-templatify text)
 824       (should (equal "createBookWithTitle:arg0 andAuthor:arg1" (buffer-string)))
 825       (should (looking-at "arg0"))
 826       (should (null (overlay-get (company-template-field-at) 'display))))))