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+;;; esh-cmd-tests.el --- esh-cmd test suite  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2022 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Tests for Eshell's command invocation.
+
+;;; Code:
+
+(require 'ert)
+(require 'esh-mode)
+(require 'eshell)
+
+(require 'eshell-tests-helpers
+         (expand-file-name "eshell-tests-helpers"
+                           (file-name-directory (or load-file-name
+                                                    default-directory))))
+
+(defvar eshell-test-value nil)
+
+;;; Tests:
+
+
+;; Command invocation
+
+(ert-deftest esh-cmd-test/simple-command-result ()
+  "Test invocation with a simple command."
+  (should (equal (eshell-test-command-result "+ 1 2") 3)))
+
+(ert-deftest esh-cmd-test/lisp-command ()
+  "Test invocation with an elisp command."
+  (should (equal (eshell-test-command-result "(+ 1 2)") 3)))
+
+(ert-deftest esh-cmd-test/lisp-command-with-quote ()
+  "Test invocation with an elisp command containing a quote."
+  (should (equal (eshell-test-command-result "(eq 'foo nil)") nil)))
+
+(ert-deftest esh-cmd-test/lisp-command-args ()
+  "Test invocation with elisp and trailing args.
+Test that trailing arguments outside the S-expression are
+ignored.  e.g. \"(+ 1 2) 3\" => 3"
+  (should (equal (eshell-test-command-result "(+ 1 2) 3") 3)))
+
+(ert-deftest esh-cmd-test/subcommand ()
+  "Test invocation with a simple subcommand."
+  (should (equal (eshell-test-command-result "{+ 1 2}") 3)))
+
+(ert-deftest esh-cmd-test/subcommand-args ()
+  "Test invocation with a subcommand and trailing args.
+Test that trailing arguments outside the subcommand are ignored.
+e.g. \"{+ 1 2} 3\" => 3"
+  (should (equal (eshell-test-command-result "{+ 1 2} 3") 3)))
+
+(ert-deftest esh-cmd-test/subcommand-lisp ()
+  "Test invocation with an elisp subcommand and trailing args.
+Test that trailing arguments outside the subcommand are ignored.
+e.g. \"{(+ 1 2)} 3\" => 3"
+  (should (equal (eshell-test-command-result "{(+ 1 2)} 3") 3)))
+
+
+;; Logical operators
+
+(ert-deftest esh-cmd-test/and-operator ()
+  "Test logical && operator."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (eshell-command-result-p "[ foo = foo ] && echo hi"
+                            "hi\n")
+   (eshell-command-result-p "[ foo = bar ] && echo hi"
+                            "\\`\\'")))
+
+(ert-deftest esh-cmd-test/or-operator ()
+  "Test logical || operator."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (eshell-command-result-p "[ foo = foo ] || echo hi"
+                            "\\`\\'")
+   (eshell-command-result-p "[ foo = bar ] || echo hi"
+                            "hi\n")))
+
+
+;; Control flow statements
+
+(ert-deftest esh-cmd-test/for-loop ()
+  "Test invocation of a for loop."
+  (with-temp-eshell
+   (eshell-command-result-p "for i in 5 { echo $i }"
+                            "5\n")))
+
+(ert-deftest esh-cmd-test/for-loop-list ()
+  "Test invocation of a for loop iterating over a list."
+  (with-temp-eshell
+   (eshell-command-result-p "for i in (list 1 2 (list 3 4)) { echo $i }"
+                            "1\n2\n(3 4)\n")))
+
+(ert-deftest esh-cmd-test/for-loop-multiple-args ()
+  "Test invocation of a for loop iterating over multiple arguments."
+  (with-temp-eshell
+   (eshell-command-result-p "for i in 1 2 (list 3 4) { echo $i }"
+                            "1\n2\n3\n4\n")))
+
+(ert-deftest esh-cmd-test/for-name-loop () ; bug#15231
+  "Test invocation of a for loop using `name'."
+  (let ((process-environment (cons "name" process-environment)))
+    (should (equal (eshell-test-command-result
+                    "for name in 3 { echo $name }")
+                   3))))
+
+(ert-deftest esh-cmd-test/for-name-shadow-loop () ; bug#15372
+  "Test invocation of a for loop using an env-var."
+  (let ((process-environment (cons "name=env-value" process-environment)))
+    (with-temp-eshell
+     (eshell-command-result-p
+      "echo $name; for name in 3 { echo $name }; echo $name"
+      "env-value\n3\nenv-value\n"))))
+
+(ert-deftest esh-cmd-test/while-loop ()
+  "Test invocation of a while loop."
+  (with-temp-eshell
+   (let ((eshell-test-value '(0 1 2)))
+     (eshell-command-result-p
+      (concat "while $eshell-test-value "
+              "{ setq eshell-test-value (cdr eshell-test-value) }")
+      "(1 2)\n(2)\n"))))
+
+(ert-deftest esh-cmd-test/while-loop-lisp-form ()
+  "Test invocation of a while loop using a Lisp form."
+  (with-temp-eshell
+   (let ((eshell-test-value 0))
+     (eshell-command-result-p
+      (concat "while (/= eshell-test-value 3) "
+              "{ setq eshell-test-value (1+ eshell-test-value) }")
+      "1\n2\n3\n"))))
+
+(ert-deftest esh-cmd-test/while-loop-ext-cmd ()
+  "Test invocation of a while loop using an external command."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (let ((eshell-test-value 0))
+     (eshell-command-result-p
+      (concat "while {[ $eshell-test-value -ne 3 ]} "
+              "{ setq eshell-test-value (1+ eshell-test-value) }")
+      "1\n2\n3\n"))))
+
+(ert-deftest esh-cmd-test/until-loop ()
+  "Test invocation of an until loop."
+  (with-temp-eshell
+   (let ((eshell-test-value nil))
+     (eshell-command-result-p
+      (concat "until $eshell-test-value "
+              "{ setq eshell-test-value t }")
+      "t\n"))))
+
+(ert-deftest esh-cmd-test/until-loop-lisp-form ()
+  "Test invocation of an until loop using a Lisp form."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (let ((eshell-test-value 0))
+     (eshell-command-result-p
+      (concat "until (= eshell-test-value 3) "
+              "{ setq eshell-test-value (1+ eshell-test-value) }")
+      "1\n2\n3\n"))))
+
+(ert-deftest esh-cmd-test/until-loop-ext-cmd ()
+  "Test invocation of an until loop using an external command."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (let ((eshell-test-value 0))
+     (eshell-command-result-p
+      (concat "until {[ $eshell-test-value -eq 3 ]} "
+              "{ setq eshell-test-value (1+ eshell-test-value) }")
+      "1\n2\n3\n"))))
+
+(ert-deftest esh-cmd-test/if-statement ()
+  "Test invocation of an if statement."
+  (with-temp-eshell
+   (let ((eshell-test-value t))
+     (eshell-command-result-p "if $eshell-test-value {echo yes}"
+                              "yes\n"))
+   (let ((eshell-test-value nil))
+     (eshell-command-result-p "if $eshell-test-value {echo yes}"
+                              "\\`\\'"))))
+
+(ert-deftest esh-cmd-test/if-else-statement ()
+  "Test invocation of an if/else statement."
+  (with-temp-eshell
+   (let ((eshell-test-value t))
+     (eshell-command-result-p "if $eshell-test-value {echo yes} {echo no}"
+                              "yes\n"))
+   (let ((eshell-test-value nil))
+     (eshell-command-result-p "if $eshell-test-value {echo yes} {echo no}"
+                              "no\n"))))
+
+(ert-deftest esh-cmd-test/if-else-statement-lisp-form ()
+  "Test invocation of an if/else statement using a Lisp form."
+  (with-temp-eshell
+   (eshell-command-result-p "if (zerop 0) {echo yes} {echo no}"
+                            "yes\n")
+   (eshell-command-result-p "if (zerop 1) {echo yes} {echo no}"
+                            "no\n")
+   (let ((debug-on-error nil))
+     (eshell-command-result-p "if (zerop \"foo\") {echo yes} {echo no}"
+                              "no\n"))))
+
+(ert-deftest esh-cmd-test/if-else-statement-lisp-form-2 ()
+  "Test invocation of an if/else statement using a Lisp form.
+This tests when `eshell-lisp-form-nil-is-failure' is nil."
+  (let ((eshell-lisp-form-nil-is-failure nil))
+    (with-temp-eshell
+     (eshell-command-result-p "if (zerop 0) {echo yes} {echo no}"
+                              "yes\n")
+     (eshell-command-result-p "if (zerop 1) {echo yes} {echo no}"
+                              "yes\n")
+     (let ((debug-on-error nil))
+       (eshell-command-result-p "if (zerop \"foo\") {echo yes} {echo no}"
+                                "no\n")))))
+
+(ert-deftest esh-cmd-test/if-else-statement-ext-cmd ()
+  "Test invocation of an if/else statement using an external command."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (eshell-command-result-p "if {[ foo = foo ]} {echo yes} {echo no}"
+                            "yes\n")
+   (eshell-command-result-p "if {[ foo = bar ]} {echo yes} {echo no}"
+                            "no\n")))
+
+(ert-deftest esh-cmd-test/unless-statement ()
+  "Test invocation of an unless statement."
+  (with-temp-eshell
+   (let ((eshell-test-value t))
+     (eshell-command-result-p "unless $eshell-test-value {echo no}"
+                              "\\`\\'"))
+   (let ((eshell-test-value nil))
+     (eshell-command-result-p "unless $eshell-test-value {echo no}"
+                              "no\n"))))
+
+(ert-deftest esh-cmd-test/unless-else-statement ()
+  "Test invocation of an unless/else statement."
+  (with-temp-eshell
+   (let ((eshell-test-value t))
+     (eshell-command-result-p "unless $eshell-test-value {echo no} {echo yes}"
+                              "yes\n"))
+   (let ((eshell-test-value nil))
+     (eshell-command-result-p "unless $eshell-test-value {echo no} {echo yes}"
+                              "no\n"))))
+
+(ert-deftest esh-cmd-test/unless-else-statement-lisp-form ()
+  "Test invocation of an unless/else statement using a Lisp form."
+  (with-temp-eshell
+   (eshell-command-result-p "unless (zerop 0) {echo no} {echo yes}"
+                            "yes\n")
+   (eshell-command-result-p "unless (zerop 1) {echo no} {echo yes}"
+                            "no\n")
+   (let ((debug-on-error nil))
+     (eshell-command-result-p "unless (zerop \"foo\") {echo no} {echo yes}"
+                              "no\n"))))
+
+(ert-deftest esh-cmd-test/unless-else-statement-ext-cmd ()
+  "Test invocation of an unless/else statement using an external command."
+  (skip-unless (executable-find "["))
+  (with-temp-eshell
+   (eshell-command-result-p "unless {[ foo = foo ]} {echo no} {echo yes}"
+                            "yes\n")
+   (eshell-command-result-p "unless {[ foo = bar ]} {echo no} {echo yes}"
+                            "no\n")))
+
+;; esh-cmd-tests.el ends here