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(require 'ert)
(require 'loop)
(ert-deftest loop-test-while ()
"Test basic `loop-while' usage."
(let ((x 0)
(sum 0))
;; sum the numbers 0 to 9
(loop-while (< x 10)
(setq sum (+ sum x))
(setq x (1+ x)))
(should (equal sum 45))))
(ert-deftest loop-test-while-break ()
"Test `loop-break' inside a `loop-while' block."
(let ((x 0)
(sum 0))
;; sum the numbers 0 to 5
(loop-while (< x 10)
(setq sum (+ sum x))
(setq x (1+ x))
(when (= x 6)
(loop-break)))
(should (equal sum 15))))
(ert-deftest loop-test-while-continue ()
"Test `loop-continue' inside a `loop-while' block."
(let ((x 0)
(sum 0))
;; sum the numbers 1, 3, 4, 5
(loop-while (< x 5)
(setq x (1+ x))
(when (= x 2)
(loop-continue))
(setq sum (+ sum x)))
(should (equal sum 13))))
(ert-deftest loop-test-do-while ()
"Test basic `loop-do-while' usage."
(let ((x 0)
(sum 0))
;; our condition is false on the first iteration
(loop-do-while (and (> x 0) (< x 10))
(setq sum (+ sum x))
(setq x (1+ x)))
(should (equal sum 45))))
(ert-deftest loop-test-do-while-continue ()
"Test `loop-continue' inside a `loop-do-while' block."
(let ((x 0)
(sum 0))
;; sum the numbers 1, 3, 4, 5
(loop-while (< x 5)
(setq x (1+ x))
(when (= x 2)
(loop-continue))
(setq sum (+ sum x)))
(should (equal sum 13))))
(ert-deftest loop-test-until ()
"Test basic `loop-until' usage."
(let ((x 0)
(sum 0))
;; sum the numbers 0 to 9
(loop-until (= x 10)
(setq sum (+ sum x))
(setq x (1+ x)))
(should (equal sum 45))))
(ert-deftest loop-test-until-break ()
"Test `loop-break' inside a `loop-until' block."
(let ((x 0)
(sum 0))
;; sum the numbers 0 to 5
(loop-until (= x 10)
(setq sum (+ sum x))
(setq x (1+ x))
(when (= x 6)
(loop-break)))
(should (equal sum 15))))
(ert-deftest loop-test-until-continue ()
"Test `loop-continue' inside a `loop-until' block."
(let ((x 0)
(sum 0))
;; sum the numbers 1, 3, 4, 5
(loop-until (= x 5)
(setq x (1+ x))
(when (= x 2)
(loop-continue))
(setq sum (+ sum x)))
(should (equal sum 13))))
(ert-deftest loop-test-for-each ()
"Test basic `loop-for-each' usage."
(let ((sum 0))
(loop-for-each x (list 1 2 3 4 5 6 7 8 9)
(setq sum (+ sum x)))
(should (equal sum 45))))
(ert-deftest loop-test-for-each-break ()
"Test `loop-break' inside a `loop-for-each' block."
(let ((sum 0))
;; sum the numbers 1 to 5
(loop-for-each x (list 1 2 3 4 5 6 7 8 9)
(setq sum (+ sum x))
(when (= x 5)
(loop-break)))
(should (equal sum 15))))
(ert-deftest loop-test-for-each-continue ()
"Test `loop-continue' inside a `loop-for-each' block."
(let ((sum 0))
;; sum the numbers 1, 3, 4, 5
(loop-for-each x (list 1 2 3 4 5)
(when (= x 2)
(loop-continue))
(setq sum (+ sum x)))
(should (equal sum 13))))
(ert-deftest loop-test-for-each-return ()
"`loop-return' should let us return values from a loop."
(should
(equal
3
(loop-for-each x (list 1 2 3 4)
(when (equal x 3)
(loop-return x))))))
(ert-deftest loop-test-for-each-line ()
(with-temp-buffer
(insert "foo\nbar\nbaz")
(let ((lines nil))
(loop-for-each-line
(let ((line-start (progn (beginning-of-line) (point)))
(line-end (progn (end-of-line) (point))))
(push (buffer-substring line-start line-end) lines)))
(should (equal (nreverse lines) '("foo" "bar" "baz"))))))
(ert-deftest loop-test-for-each-line-ignores-movement ()
"We should execute BODY once for each line, even if point moves around."
(with-temp-buffer
(insert "foo\nbar\nbaz")
(let ((lines nil))
(loop-for-each-line
(let ((line-start (progn (beginning-of-line) (point)))
(line-end (progn (end-of-line) (point))))
(push (buffer-substring line-start line-end) lines)
;; This line should have no effect.
(forward-line 1)))
(should (equal (nreverse lines) '("foo" "bar" "baz"))))))
(ert-deftest loop-test-for-each-line-it-line ()
"We should have `it' set inside `loop-for-each-line'."
(with-temp-buffer
(insert "foo\nbar\nbaz")
(let ((lines nil))
(loop-for-each-line
(push it lines))
(should (equal (nreverse lines) '("foo" "bar" "baz"))))))
(ert-deftest loop-test-for-each-line-break ()
"Test breaking out of `loop-for-each-line'."
(with-temp-buffer
(insert "foo\nbar\nbaz")
(let ((lines nil))
(loop-for-each-line
(let ((line-start (save-excursion (beginning-of-line) (point)))
(line-end (save-excursion (end-of-line) (point))))
(when (looking-at "bar")
(loop-break))
(push (buffer-substring line-start line-end) lines)))
(should (equal (nreverse lines) '("foo"))))))
(ert-deftest loop-test-for-each-line-continue ()
"Test continuing in `loop-for-each-line'."
(with-temp-buffer
(insert "foo\nbar\nbaz")
(let ((lines nil))
(loop-for-each-line
(let ((line-start (save-excursion (beginning-of-line) (point)))
(line-end (save-excursion (end-of-line) (point))))
(when (looking-at "bar")
(loop-continue))
(push (buffer-substring line-start line-end) lines)))
(should (equal (nreverse lines) '("foo" "baz"))))))
(defun loop-run-tests ()
"Run all unit tests for loop.el"
(interactive)
(ert-run-tests-interactively "loop-test-"))
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