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+;;; cider-test.el --- Test result viewer -*- lexical-binding: t -*-
+
+;; Copyright © 2014-2018 Jeff Valk, Bozhidar Batsov and CIDER contributors
+
+;; Author: Jeff Valk <jv@jeffvalk.com>
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+;; This file is not part of GNU Emacs.
+
+;;; Commentary:
+
+;; This provides execution, reporting, and navigation support for Clojure tests,
+;; specifically using the `clojure.test' machinery.  This functionality replaces
+;; the venerable `clojure-test-mode' (deprecated in June 2014), and relies on
+;; nREPL middleware for report running and session support.
+
+;;; Code:
+
+(require 'cider-common)
+(require 'cider-client)
+(require 'cider-popup)
+(require 'cider-stacktrace)
+(require 'subr-x)
+(require 'cider-compat)
+(require 'cider-overlays)
+
+(require 'button)
+(require 'cl-lib)
+(require 'easymenu)
+(require 'seq)
+
+;;; Variables
+
+(defgroup cider-test nil
+  "Presentation and navigation for test results."
+  :prefix "cider-test-"
+  :group 'cider)
+
+(defcustom cider-test-show-report-on-success nil
+  "Whether to show the `*cider-test-report*` buffer on passing tests."
+  :type 'boolean
+  :group 'cider-test
+  :package-version '(cider . "0.8.0"))
+
+(defcustom cider-auto-select-test-report-buffer t
+  "Determines if the test-report buffer should be auto-selected."
+  :type 'boolean
+  :group 'cider-test
+  :package-version '(cider . "0.9.0"))
+
+(defcustom cider-test-defining-forms '("deftest" "defspec")
+  "Forms that define individual tests.
+CIDER considers the \"top-level\" form around point to define a test if
+the form starts with one of these forms.
+Add to this list to have CIDER recognize additional test defining macros."
+  :type '(repeat string)
+  :group 'cider-test
+  :package-version '(cider . "0.15.0"))
+
+(defvar cider-test-last-summary nil
+  "The summary of the last run test.")
+
+(defvar cider-test-last-results nil
+  "The results of the last run test.")
+
+(defconst cider-test-report-buffer "*cider-test-report*"
+  "Buffer name in which to display test reports.")
+
+;;; Faces
+
+(defface cider-test-failure-face
+  '((((class color) (background light))
+     :background "orange red")
+    (((class color) (background dark))
+     :background "firebrick"))
+  "Face for failed tests."
+  :group 'cider-test
+  :package-version '(cider . "0.7.0"))
+
+(defface cider-test-error-face
+  '((((class color) (background light))
+     :background "orange1")
+    (((class color) (background dark))
+     :background "orange4"))
+  "Face for erring tests."
+  :group 'cider-test
+  :package-version '(cider . "0.7.0"))
+
+(defface cider-test-success-face
+  '((((class color) (background light))
+     :foreground "black"
+     :background "green")
+    (((class color) (background dark))
+     :foreground "black"
+     :background "green"))
+  "Face for passing tests."
+  :group 'cider-test
+  :package-version '(cider . "0.7.0"))
+
+
+;; Colors & Theme Support
+
+(defvar cider-test-items-background-color
+  (cider-scale-background-color)
+  "Background color for test assertion items.")
+
+(defadvice enable-theme (after cider-test-adapt-to-theme activate)
+  "When theme is changed, update `cider-test-items-background-color'."
+  (setq cider-test-items-background-color (cider-scale-background-color)))
+
+
+(defadvice disable-theme (after cider-test-adapt-to-theme activate)
+  "When theme is disabled, update `cider-test-items-background-color'."
+  (setq cider-test-items-background-color (cider-scale-background-color)))
+
+
+;;; Report mode & key bindings
+;;
+;; The primary mode of interacting with test results is the report buffer, which
+;; allows navigation among tests, jumping to test definitions, expected/actual
+;; diff-ing, and cause/stacktrace inspection for test errors.
+
+(defvar cider-test-commands-map
+  (let ((map (define-prefix-command 'cider-test-commands-map)))
+    ;; Duplicates of keys below with C- for convenience
+    (define-key map (kbd "C-r") #'cider-test-rerun-failed-tests)
+    (define-key map (kbd "C-t") #'cider-test-run-test)
+    (define-key map (kbd "C-g") #'cider-test-rerun-test)
+    (define-key map (kbd "C-n") #'cider-test-run-ns-tests)
+    (define-key map (kbd "C-s") #'cider-test-run-ns-tests-with-filters)
+    (define-key map (kbd "C-l") #'cider-test-run-loaded-tests)
+    (define-key map (kbd "C-p") #'cider-test-run-project-tests)
+    (define-key map (kbd "C-b") #'cider-test-show-report)
+    ;; Single-key bindings defined last for display in menu
+    (define-key map (kbd "r")   #'cider-test-rerun-failed-tests)
+    (define-key map (kbd "t")   #'cider-test-run-test)
+    (define-key map (kbd "g")   #'cider-test-rerun-test)
+    (define-key map (kbd "n")   #'cider-test-run-ns-tests)
+    (define-key map (kbd "s")   #'cider-test-run-ns-tests-with-filters)
+    (define-key map (kbd "l")   #'cider-test-run-loaded-tests)
+    (define-key map (kbd "p")   #'cider-test-run-project-tests)
+    (define-key map (kbd "b")   #'cider-test-show-report)
+    map))
+
+(defconst cider-test-menu
+  '("Test"
+    ["Run test" cider-test-run-test]
+    ["Run namespace tests" cider-test-run-ns-tests]
+    ["Run namespace tests with filters" cider-test-run-ns-tests-with-filters]
+    ["Run all loaded tests" cider-test-run-loaded-tests]
+    ["Run all loaded tests with filters" (apply-partially cider-test-run-loaded-tests 'prompt-for-filters)]
+    ["Run all project tests" cider-test-run-project-tests]
+    ["Run all project tests with filters" (apply-partially cider-test-run-project-tests 'prompt-for-filters)]
+    ["Run tests after load-file" cider-auto-test-mode
+     :style toggle :selected cider-auto-test-mode]
+    "--"
+    ["Interrupt running tests" cider-interrupt]
+    ["Rerun failed/erring tests" cider-test-rerun-failed-tests]
+    ["Show test report" cider-test-show-report]
+    "--"
+    ["Configure testing" (customize-group 'cider-test)])
+  "CIDER test submenu.")
+
+(defvar cider-test-report-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "C-c ,")   'cider-test-commands-map)
+    (define-key map (kbd "C-c C-t") 'cider-test-commands-map)
+    (define-key map (kbd "M-p") #'cider-test-previous-result)
+    (define-key map (kbd "M-n") #'cider-test-next-result)
+    (define-key map (kbd "M-.") #'cider-test-jump)
+    (define-key map (kbd "<backtab>") #'cider-test-previous-result)
+    (define-key map (kbd "TAB") #'cider-test-next-result)
+    (define-key map (kbd "RET") #'cider-test-jump)
+    (define-key map (kbd "t") #'cider-test-jump)
+    (define-key map (kbd "d") #'cider-test-ediff)
+    (define-key map (kbd "e") #'cider-test-stacktrace)
+    ;; `f' for "run failed".
+    (define-key map "f" #'cider-test-rerun-failed-tests)
+    (define-key map "n" #'cider-test-run-ns-tests)
+    (define-key map "s" #'cider-test-run-ns-tests-with-filters)
+    (define-key map "l" #'cider-test-run-loaded-tests)
+    (define-key map "p" #'cider-test-run-project-tests)
+    ;; `g' generally reloads the buffer.  The closest thing we have to that is
+    ;; "run the test at point".  But it's not as nice as rerunning all tests in
+    ;; this buffer.
+    (define-key map "g" #'cider-test-run-test)
+    (define-key map "q" #'cider-popup-buffer-quit-function)
+    (easy-menu-define cider-test-report-mode-menu map
+      "Menu for CIDER's test result mode"
+      '("Test-Report"
+        ["Previous result" cider-test-previous-result]
+        ["Next result" cider-test-next-result]
+        "--"
+        ["Rerun current test" cider-test-run-test]
+        ["Rerun failed/erring tests" cider-test-rerun-failed-tests]
+        ["Run all ns tests" cider-test-run-ns-tests]
+        ["Run all ns tests with filters" cider-test-run-ns-tests-with-filters]
+        ["Run all loaded tests" cider-test-run-loaded-tests]
+        ["Run all loaded tests with filters" (apply-partially cider-test-run-loaded-tests 'prompt-for-filters)]
+        ["Run all project tests" cider-test-run-project-tests]
+        ["Run all project tests with filters" (apply-partially cider-test-run-project-tests 'prompt-for-filters)]
+        "--"
+        ["Jump to test definition" cider-test-jump]
+        ["Display test error" cider-test-stacktrace]
+        ["Display expected/actual diff" cider-test-ediff]))
+    map))
+
+(define-derived-mode cider-test-report-mode fundamental-mode "Test Report"
+  "Major mode for presenting Clojure test results.
+
+\\{cider-test-report-mode-map}"
+  (setq buffer-read-only t)
+  (when cider-special-mode-truncate-lines
+    (setq-local truncate-lines t))
+  (setq-local sesman-system 'CIDER)
+  (setq-local electric-indent-chars nil))
+
+;; Report navigation
+
+(defun cider-test-show-report ()
+  "Show the test report buffer, if one exists."
+  (interactive)
+  (if-let* ((report-buffer (get-buffer cider-test-report-buffer)))
+      (switch-to-buffer report-buffer)
+    (message "No test report buffer")))
+
+(defun cider-test-previous-result ()
+  "Move point to the previous test result, if one exists."
+  (interactive)
+  (with-current-buffer (get-buffer cider-test-report-buffer)
+    (when-let* ((pos (previous-single-property-change (point) 'type)))
+      (if (get-text-property pos 'type)
+          (goto-char pos)
+        (when-let* ((pos (previous-single-property-change pos 'type)))
+          (goto-char pos))))))
+
+(defun cider-test-next-result ()
+  "Move point to the next test result, if one exists."
+  (interactive)
+  (with-current-buffer (get-buffer cider-test-report-buffer)
+    (when-let* ((pos (next-single-property-change (point) 'type)))
+      (if (get-text-property pos 'type)
+          (goto-char pos)
+        (when-let* ((pos (next-single-property-change pos 'type)))
+          (goto-char pos))))))
+
+(declare-function cider-find-var "cider-find")
+
+(defun cider-test-jump (&optional arg)
+  "Find definition for test at point, if available.
+The prefix ARG and `cider-prompt-for-symbol' decide whether to
+prompt and whether to use a new window.  Similar to `cider-find-var'."
+  (interactive "P")
+  (let ((ns   (get-text-property (point) 'ns))
+        (var  (get-text-property (point) 'var))
+        (line (get-text-property (point) 'line)))
+    (if (and ns var)
+        (cider-find-var arg (concat ns "/" var) line)
+      (cider-find-var arg))))
+
+;;; Error stacktraces
+
+(defvar cider-auto-select-error-buffer)
+
+(defun cider-test-stacktrace-for (ns var index)
+  "Display stacktrace for the erring NS VAR test with the assertion INDEX."
+  (let (causes)
+    (cider-nrepl-send-request
+     (nconc `("op" "test-stacktrace"
+              "ns" ,ns
+              "var" ,var
+              "index" ,index)
+            (when (cider--pprint-fn)
+              `("pprint-fn" ,(cider--pprint-fn)))
+            (when cider-stacktrace-print-length
+              `("print-length" ,cider-stacktrace-print-length))
+            (when cider-stacktrace-print-level
+              `("print-level" ,cider-stacktrace-print-level)))
+     (lambda (response)
+       (nrepl-dbind-response response (class status)
+         (cond (class  (setq causes (cons response causes)))
+               (status (when causes
+                         (cider-stacktrace-render
+                          (cider-popup-buffer cider-error-buffer
+                                              cider-auto-select-error-buffer
+                                              #'cider-stacktrace-mode
+                                              'ancillary)
+                          (reverse causes))))))))))
+
+(defun cider-test-stacktrace ()
+  "Display stacktrace for the erring test at point."
+  (interactive)
+  (let ((ns    (get-text-property (point) 'ns))
+        (var   (get-text-property (point) 'var))
+        (index (get-text-property (point) 'index))
+        (err   (get-text-property (point) 'error)))
+    (if (and err ns var index)
+        (cider-test-stacktrace-for ns var index)
+      (message "No test error at point"))))
+
+
+;;; Expected vs actual diffing
+
+(defvar cider-test-ediff-buffers nil
+  "The expected/actual buffers used to display diff.")
+
+(defun cider-test--extract-from-actual (actual n)
+  "Extract form N from ACTUAL, ignoring outermost not.
+
+ACTUAL is a string like \"(not (= 3 4))\", of the sort returned by
+clojure.test.
+
+N = 1 => 3, N = 2 => 4, etc."
+  (with-temp-buffer
+    (insert actual)
+    (clojure-mode)
+    (goto-char (point-min))
+    (re-search-forward "(" nil t 2)
+    (clojure-forward-logical-sexp n)
+    (forward-whitespace 1)
+    (let ((beg (point)))
+      (clojure-forward-logical-sexp)
+      (buffer-substring beg (point)))))
+
+(defun cider-test-ediff ()
+  "Show diff of the expected vs actual value for the test at point.
+With the actual value, the outermost '(not ...)' s-expression is removed."
+  (interactive)
+  (let* ((expected-buffer (generate-new-buffer " *expected*"))
+         (actual-buffer   (generate-new-buffer " *actual*"))
+         (diffs (get-text-property (point) 'diffs))
+         (actual* (get-text-property (point) 'actual))
+         (expected (cond (diffs (get-text-property (point) 'expected))
+                         (actual* (cider-test--extract-from-actual actual* 1))))
+         (actual (cond (diffs (caar diffs))
+                       (actual* (cider-test--extract-from-actual actual* 2)))))
+    (if (not (and expected actual))
+        (message "No test failure at point")
+      (with-current-buffer expected-buffer
+        (insert expected)
+        (clojure-mode))
+      (with-current-buffer actual-buffer
+        (insert actual)
+        (clojure-mode))
+      (apply #'ediff-buffers
+             (setq cider-test-ediff-buffers
+                   (list (buffer-name expected-buffer)
+                         (buffer-name actual-buffer)))))))
+
+(defun cider-test-ediff-cleanup ()
+  "Cleanup expected/actual buffers used for diff."
+  (interactive)
+  (mapc (lambda (b) (when (get-buffer b) (kill-buffer b)))
+        cider-test-ediff-buffers))
+
+(add-hook 'ediff-cleanup-hook #'cider-test-ediff-cleanup)
+
+
+;;; Report rendering
+
+(defun cider-test-type-face (type)
+  "Return the font lock face for the test result TYPE."
+  (pcase type
+    ("pass"  'cider-test-success-face)
+    ("fail"  'cider-test-failure-face)
+    ("error" 'cider-test-error-face)
+    (_       'default)))
+
+(defun cider-test-type-simple-face (type)
+  "Return a face for the test result TYPE using the highlight color as foreground."
+  (let ((face (cider-test-type-face type)))
+    `(:foreground ,(face-attribute face :background))))
+
+(defun cider-test-render-summary (buffer summary)
+  "Emit into BUFFER the report SUMMARY statistics."
+  (with-current-buffer buffer
+    (nrepl-dbind-response summary (ns var test pass fail error)
+      (insert (format "Tested %d namespaces\n" ns))
+      (insert (format "Ran %d assertions, in %d test functions\n" test var))
+      (unless (zerop fail)
+        (cider-insert (format "%d failures" fail) 'cider-test-failure-face t))
+      (unless (zerop error)
+        (cider-insert (format "%d errors" error) 'cider-test-error-face t))
+      (when (zerop (+ fail error))
+        (cider-insert (format "%d passed" pass) 'cider-test-success-face t))
+      (insert "\n\n"))))
+
+(defun cider-test-render-assertion (buffer test)
+  "Emit into BUFFER report detail for the TEST assertion."
+  (with-current-buffer buffer
+    (nrepl-dbind-response test (var context type message expected actual diffs error gen-input)
+      (cl-flet ((insert-label (s)
+                  (cider-insert (format "%8s: " s) 'font-lock-comment-face))
+                (insert-align-label (s)
+                  (insert (format "%12s" s)))
+                (insert-rect (s)
+                  (insert-rectangle (thread-first s
+                                      cider-font-lock-as-clojure
+                                      (split-string "\n")))
+                  (beginning-of-line)))
+        (cider-propertize-region (cider-intern-keys (cdr test))
+          (let ((beg (point))
+                (type-face (cider-test-type-simple-face type))
+                (bg `(:background ,cider-test-items-background-color)))
+            (cider-insert (capitalize type) type-face nil " in ")
+            (cider-insert var 'font-lock-function-name-face t)
+            (when context  (cider-insert context 'font-lock-doc-face t))
+            (when message  (cider-insert message 'font-lock-doc-string-face t))
+            (when expected
+              (insert-label "expected")
+              (insert-rect expected)
+              (insert "\n"))
+            (if diffs
+                (dolist (d diffs)
+                  (cl-destructuring-bind (actual (removed added)) d
+                    (insert-label "actual")
+                    (insert-rect actual)
+                    (insert-label "diff")
+                    (insert "- ")
+                    (insert-rect removed)
+                    (insert-align-label "+ ")
+                    (insert-rect added)
+                    (insert "\n")))
+              (when actual
+                (insert-label "actual")
+                (insert-rect actual)))
+            (when error
+              (insert-label "error")
+              (insert-text-button error
+                                  'follow-link t
+                                  'action '(lambda (_button) (cider-test-stacktrace))
+                                  'help-echo "View causes and stacktrace")
+              (insert "\n"))
+            (when gen-input
+              (insert-label "input")
+              (insert (cider-font-lock-as-clojure gen-input)))
+            (overlay-put (make-overlay beg (point)) 'font-lock-face bg))
+          (insert "\n"))))))
+
+(defun cider-test-non-passing (tests)
+  "For a list of TESTS, each an `nrepl-dict`, return only those that did not pass."
+  (seq-filter (lambda (test)
+                (unless (equal (nrepl-dict-get test "type") "pass")
+                  test))
+              tests))
+
+(defun cider-test-render-report (buffer summary results)
+  "Emit into BUFFER the report for the SUMMARY, and test RESULTS."
+  (with-current-buffer buffer
+    (let ((inhibit-read-only t))
+      (cider-test-report-mode)
+      (cider-insert "Test Summary" 'bold t)
+      (dolist (ns (nrepl-dict-keys results))
+        (insert (cider-propertize ns 'ns) "\n"))
+      (cider-insert "\n")
+      (cider-test-render-summary buffer summary)
+      (nrepl-dbind-response summary (fail error)
+        (unless (zerop (+ fail error))
+          (cider-insert "Results" 'bold t "\n")
+          ;; Results are a nested dict, keyed first by ns, then var. Within each
+          ;; var is a sequence of test assertion results.
+          (nrepl-dict-map
+           (lambda (ns vars)
+             (nrepl-dict-map
+              (lambda (_var tests)
+                (let* ((problems (cider-test-non-passing tests))
+                       (count (length problems)))
+                  (when (< 0 count)
+                    (insert (format "%s\n%d non-passing tests:\n\n"
+                                    (cider-propertize ns 'ns) count))
+                    (dolist (test problems)
+                      (cider-test-render-assertion buffer test)))))
+              vars))
+           results)))
+      (goto-char (point-min))
+      (current-buffer))))
+
+
+;;; Message echo
+
+(defun cider-test-echo-running (ns &optional test)
+  "Echo a running message for the test NS, which may be a keyword.
+The optional arg TEST denotes an individual test name."
+  (if test
+      (message "Running test %s in %s..."
+               (cider-propertize test 'bold)
+               (cider-propertize ns 'ns))
+    (message "Running tests in %s..."
+             (concat (cider-propertize
+                      (cond ((stringp ns) ns)
+                            ((eq :non-passing ns) "failing")
+                            ((eq :loaded ns)  "all loaded")
+                            ((eq :project ns) "all project"))
+                      'ns)
+                     (unless (stringp ns) " namespaces")))))
+
+(defun cider-test-echo-summary (summary results)
+  "Echo SUMMARY statistics for a test run returning RESULTS."
+  (nrepl-dbind-response summary (ns test var fail error)
+    (if (nrepl-dict-empty-p results)
+        (message (concat (propertize "No assertions (or no tests) were run." 'face 'cider-test-error-face)
+                         "Did you forget to use `is' in your tests?"))
+      (message (propertize
+                "%sRan %d assertions, in %d test functions. %d failures, %d errors."
+                'face (cond ((not (zerop error)) 'cider-test-error-face)
+                            ((not (zerop fail))  'cider-test-failure-face)
+                            (t                   'cider-test-success-face)))
+               (concat (if (= 1 ns)     ; ns count from summary
+                           (cider-propertize (car (nrepl-dict-keys results)) 'ns)
+                         (propertize (format "%d namespaces" ns) 'face 'default))
+                       (propertize ": " 'face 'default))
+               test var fail error))))
+
+;;; Test definition highlighting
+;;
+;; On receipt of test results, failing/erring test definitions are highlighted.
+;; Highlights are cleared on the next report run, and may be cleared manually
+;; by the user.
+
+;; NOTE If keybindings specific to test sources are desired, it would be
+;; straightforward to turn this into a `cider-test-mode' minor mode, which we
+;; enable on test sources, much like the legacy `clojure-test-mode'. At present,
+;; though, there doesn't seem to be much value in this, since the report buffer
+;; provides the primary means of interacting with test results.
+
+(defun cider-test-highlight-problem (buffer test)
+  "Highlight the BUFFER test definition for the non-passing TEST."
+  (with-current-buffer buffer
+    ;; we don't need the file name here, as we always operate on the current
+    ;; buffer and the line data is correct even for vars that were
+    ;; defined interactively
+    (nrepl-dbind-response test (type line message expected actual)
+      (when line
+        (save-excursion
+          (goto-char (point-min))
+          (forward-line (1- line))
+          (search-forward "(" nil t)
+          (let ((beg (point)))
+            (forward-sexp)
+            (cider--make-overlay beg (point) 'cider-test
+                                 'font-lock-face (cider-test-type-face type)
+                                 'type type
+                                 'help-echo message
+                                 'message message
+                                 'expected expected
+                                 'actual actual)))))))
+
+(defun cider-find-var-file (ns var)
+  "Return the buffer visiting the file in which the NS VAR is defined.
+Or nil if not found."
+  (cider-ensure-op-supported "info")
+  (when-let* ((info (cider-var-info (concat ns "/" var)))
+              (file (nrepl-dict-get info "file")))
+    (cider-find-file file)))
+
+(defun cider-test-highlight-problems (results)
+  "Highlight all non-passing tests in the test RESULTS."
+  (nrepl-dict-map
+   (lambda (ns vars)
+     (nrepl-dict-map
+      (lambda (var tests)
+        (when-let* ((buffer (cider-find-var-file ns var)))
+          (dolist (test tests)
+            (nrepl-dbind-response test (type)
+              (unless (equal "pass" type)
+                (cider-test-highlight-problem buffer test))))))
+      vars))
+   results))
+
+(defun cider-test-clear-highlights ()
+  "Clear highlighting of non-passing tests from the last test run."
+  (interactive)
+  (when cider-test-last-results
+    (nrepl-dict-map
+     (lambda (ns vars)
+       (dolist (var (nrepl-dict-keys vars))
+         (when-let* ((buffer (cider-find-var-file ns var)))
+           (with-current-buffer buffer
+             (remove-overlays nil nil 'category 'cider-test)))))
+     cider-test-last-results)))
+
+
+;;; Test namespaces
+;;
+;; Test namespace inference exists to enable DWIM test running functions: the
+;; same "run-tests" function should be able to be used in a source file, and in
+;; its corresponding test namespace. To provide this, we need to map the
+;; relationship between those namespaces.
+
+(defcustom cider-test-infer-test-ns 'cider-test-default-test-ns-fn
+  "Function to infer the test namespace for NS.
+The default implementation uses the simple Leiningen convention of appending
+'-test' to the namespace name."
+  :type 'symbol
+  :group 'cider-test
+  :package-version '(cider . "0.7.0"))
+
+(defun cider-test-default-test-ns-fn (ns)
+  "For a NS, return the test namespace, which may be the argument itself.
+This uses the Leiningen convention of appending '-test' to the namespace name."
+  (when ns
+    (let ((suffix "-test"))
+      (if (string-suffix-p suffix ns)
+          ns
+        (concat ns suffix)))))
+
+
+;;; Test execution
+
+(declare-function cider-emit-interactive-eval-output "cider-eval")
+(declare-function cider-emit-interactive-eval-err-output "cider-eval")
+
+(defun cider-test--prompt-for-selectors (message)
+  "Prompt for test selectors with MESSAGE.
+The selectors can be either keywords or strings."
+  (mapcar
+   (lambda (string) (replace-regexp-in-string "^:+" "" string))
+   (split-string
+    (cider-read-from-minibuffer message))))
+
+(defun cider-test-execute (ns &optional tests silent prompt-for-filters)
+  "Run tests for NS, which may be a keyword, optionally specifying TESTS.
+This tests a single NS, or multiple namespaces when using keywords `:project',
+`:loaded' or `:non-passing'.  Optional TESTS are only honored when a single
+namespace is specified.  Upon test completion, results are echoed and a test
+report is optionally displayed.  When test failures/errors occur, their sources
+are highlighted.
+If SILENT is non-nil, suppress all messages other then test results.
+If PROMPT-FOR-FILTERS is non-nil, prompt the user for a test selector filters.
+The include/exclude selectors will be used to filter the tests before
+ running them."
+  (cider-test-clear-highlights)
+  (let ((include-selectors
+         (when prompt-for-filters
+           (cider-test--prompt-for-selectors "Test selectors to include (space separated): ")))
+        (exclude-selectors
+         (when prompt-for-filters
+           (cider-test--prompt-for-selectors "Test selectors to exclude (space separated): "))))
+    (cider-map-repls :clj-strict
+      (lambda (conn)
+        (unless silent
+          (if (and tests (= (length tests) 1))
+              ;; we generate a different message when running individual tests
+              (cider-test-echo-running ns (car tests))
+            (cider-test-echo-running ns)))
+        (let ((request `("op" ,(cond ((stringp ns)         "test")
+                                     ((eq :project ns)     "test-all")
+                                     ((eq :loaded ns)      "test-all")
+                                     ((eq :non-passing ns) "retest")))))
+          ;; we add optional parts of the request only when relevant
+          (when (and (listp include-selectors) include-selectors)
+            (setq request (append request `("include" ,include-selectors))))
+          (when (and (listp exclude-selectors) exclude-selectors)
+            (setq request (append request `("exclude" ,exclude-selectors))))
+          (when (stringp ns)
+            (setq request (append request `("ns" ,ns))))
+          (when (stringp ns)
+            (setq request (append request `("tests" ,tests))))
+          (when (or (stringp ns) (eq :project ns))
+            (setq request (append request `("load?" ,"true"))))
+          (cider-nrepl-send-request
+           request
+           (lambda (response)
+             (nrepl-dbind-response response (summary results status out err)
+               (cond ((member "namespace-not-found" status)
+                      (unless silent
+                        (message "No test namespace: %s" (cider-propertize ns 'ns))))
+                     (out (cider-emit-interactive-eval-output out))
+                     (err (cider-emit-interactive-eval-err-output err))
+                     (results
+                      (nrepl-dbind-response summary (error fail)
+                        (setq cider-test-last-summary summary)
+                        (setq cider-test-last-results results)
+                        (cider-test-highlight-problems results)
+                        (cider-test-echo-summary summary results)
+                        (if (or (not (zerop (+ error fail)))
+                                cider-test-show-report-on-success)
+                            (cider-test-render-report
+                             (cider-popup-buffer
+                              cider-test-report-buffer
+                              cider-auto-select-test-report-buffer)
+                             summary
+                             results)
+                          (when (get-buffer cider-test-report-buffer)
+                            (with-current-buffer cider-test-report-buffer
+                              (let ((inhibit-read-only t))
+                                (erase-buffer)))
+                            (cider-test-render-report
+                             cider-test-report-buffer
+                             summary results))))))))
+           conn))))))
+
+(defun cider-test-rerun-failed-tests ()
+  "Rerun failed and erring tests from the last test run."
+  (interactive)
+  (if cider-test-last-summary
+      (nrepl-dbind-response cider-test-last-summary (fail error)
+        (if (not (zerop (+ error fail)))
+            (cider-test-execute :non-passing)
+          (message "No prior failures to retest")))
+    (message "No prior results to retest")))
+
+(defun cider-test-run-loaded-tests (prompt-for-filters)
+  "Run all tests defined in currently loaded namespaces.
+
+If PROMPT-FOR-FILTERS is non-nil, prompt the user for a test selectors to filter the tests with."
+  (interactive "P")
+  (cider-test-execute :loaded nil nil prompt-for-filters))
+
+(defun cider-test-run-project-tests (prompt-for-filters)
+  "Run all tests defined in all project namespaces, loading these as needed.
+
+If PROMPT-FOR-FILTERS is non-nil, prompt the user for a test selectors to filter the tests with."
+  (interactive "P")
+  (cider-test-execute :project nil nil prompt-for-filters))
+
+(defun cider-test-run-ns-tests-with-filters (suppress-inference)
+  "Run tests filtered by selectors for the current Clojure namespace context.
+
+With a prefix arg SUPPRESS-INFERENCE it will try to run the tests in the
+current ns."
+  (interactive "P")
+  (cider-test-run-ns-tests suppress-inference nil 't))
+
+(defun cider-test-run-ns-tests (suppress-inference &optional silent prompt-for-filters)
+  "Run all tests for the current Clojure namespace context.
+
+If SILENT is non-nil, suppress all messages other then test results.
+With a prefix arg SUPPRESS-INFERENCE it will try to run the tests in the
+current ns.  If PROMPT-FOR-FILTERS is non-nil, prompt the user for
+test selectors to filter the tests with."
+  (interactive "P")
+  (if-let* ((ns (if suppress-inference
+                    (cider-current-ns t)
+                  (funcall cider-test-infer-test-ns (cider-current-ns t)))))
+      (cider-test-execute ns nil silent prompt-for-filters)
+    (if (eq major-mode 'cider-test-report-mode)
+        (when (y-or-n-p (concat "Test report does not define a namespace. "
+                                "Rerun failed/erring tests?"))
+          (cider-test-rerun-failed-tests))
+      (unless silent
+        (message "No namespace to test in current context")))))
+
+(defvar cider-test-last-test-ns nil
+  "The ns of the last test ran with `cider-test-run-test'.")
+(defvar cider-test-last-test-var nil
+  "The var of the last test ran with `cider-test-run-test'.")
+
+(defun cider-test-update-last-test (ns var)
+  "Update the last test by setting NS and VAR.
+
+See `cider-test-rerun-test'."
+  (setq cider-test-last-test-ns ns
+        cider-test-last-test-var var))
+
+(defun cider-test-run-test ()
+  "Run the test at point.
+The test ns/var exist as text properties on report items and on highlighted
+failed/erred test definitions.  When not found, a test definition at point
+is searched."
+  (interactive)
+  (let ((ns  (get-text-property (point) 'ns))
+        (var (get-text-property (point) 'var)))
+    (if (and ns var)
+        ;; we're in a `cider-test-report-mode' buffer
+        ;; or on a highlighted failed/erred test definition
+        (progn
+          (cider-test-update-last-test ns var)
+          (cider-test-execute ns (list var)))
+      ;; we're in a `clojure-mode' buffer
+      (let* ((ns  (clojure-find-ns))
+             (def (clojure-find-def)) ; it's a list of the form (deftest something)
+             (deftype (car def))
+             (var (cadr def)))
+        (if (and ns (member deftype cider-test-defining-forms))
+            (progn
+              (cider-test-update-last-test ns (list var))
+              (cider-test-execute ns (list var)))
+          (message "No test at point"))))))
+
+(defun cider-test-rerun-test ()
+  "Re-run the test that was previously ran."
+  (interactive)
+  (if (and cider-test-last-test-ns cider-test-last-test-var)
+      (cider-test-execute cider-test-last-test-ns cider-test-last-test-var)
+    (user-error "No test to re-run")))
+
+;;; Auto-test mode
+(defun cider--test-silently ()
+  "Like `cider-test-run-tests', but with less feedback.
+Only notify the user if there actually were any tests to run and only after
+the results are received."
+  (when (cider-connected-p)
+    (let ((cider-auto-select-test-report-buffer nil)
+          (cider-test-show-report-on-success nil))
+      (cider-test-run-ns-tests nil 'soft))))
+
+;;;###autoload
+(define-minor-mode cider-auto-test-mode
+  "Toggle automatic testing of Clojure files.
+
+When enabled this reruns tests every time a Clojure file is loaded.
+Only runs tests corresponding to the loaded file's namespace and does
+nothing if no tests are defined or if the file failed to load."
+  nil (cider-mode " Test") nil
+  :global t
+  (if cider-auto-test-mode
+      (add-hook 'cider-file-loaded-hook #'cider--test-silently)
+    (remove-hook 'cider-file-loaded-hook #'cider--test-silently)))
+
+(provide 'cider-test)
+
+;;; cider-test.el ends here