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+# This file serves as a model for how to write tests, so is more heavily
+# commented that the others. All tests are run in the Test subdirectory
+# of the distribution, which must be writable. They should end with
+# the suffix `.ztst': this is not required by the test harness itself,
+# but it is needed by the Makefile to run all the tests.
+
+# Blank lines with no other special meaning (e.g. separating chunks of
+# code) and all those with a `#' in the first column are ignored.
+
+# All section names start with a % in the first column. The names
+# must be in the expected order, though not all sections are required.
+# The sections are %prep (preparatory setup: code executed should return
+# status 0, but no other tests are performed), %test (the main tests), and
+# %clean (to cleanup: the code is simply unconditionally executed).
+#
+# Literal shell code to be evaluated must be indented with any number
+# of spaces and/or tabs, to differentiate it from tags with a special
+# meaning to the test harness. Note that this is true even in sections
+# where there are no such tags. Also note that file descriptor 9
+# is reserved for input from the test script; if ZTST_verbose is set,
+# output is sent to the original stdout via fd 8. Option settings
+# are preserved between the execution of different code chunks;
+# initially, all standard zsh options (the effect of `emulate -R zsh')
+# are set.
+
+%prep
+# This optional section prepares the test, creating directories and files
+# and so on. Chunks of code are separated by blank lines (which is not
+# necessary before the end of the section); each chunk of code is evaluated
+# in one go and must return status 0, or the preparation is deemed to have
+# failed and the test ends with an appropriate error message. Standard
+# output from this section is redirected to /dev/null, but standard error
+# is not redirected.
+#
+# Tests should use subdirectories ending in `.tmp'. These will be
+# removed with all the contents even if the test is aborted.
+ mkdir cdtst.tmp cdtst.tmp/real cdtst.tmp/sub
+
+ ln -s ../real cdtst.tmp/sub/fake
+
+ mydir=$PWD
+
+%test
+# This is where the tests are run. It consists of blocks separated
+# by blank lines. Each block has the same format and there may be any
+# number of them. It consists of indented code, plus optional sets of lines
+# beginning '<', '>' and '?' which may appear in any order. These correspond
+# to stdin (fed to the code), stdout (compared with code output) and
+# stderr (compared with code error output) respectively. These subblocks
+# may occur in any order, but the natural one is: code, stdin, stdout,
+# stderr.
+#
+# The rules for '<', '>' and '?' lines are the same: only the first
+# character is stripped, with subsequent whitespace being significant;
+# lines are not subject to any substitution unless the `q' flags (see
+# below) is set.
+#
+# Each chunk of indented code is to be evaluated in one go and is to
+# be followed by a line starting (in the first column) with
+# the expected status returned by the code when run, or - if it is
+# irrelevant. An optional set of single-letter flags follows the status
+# or -. The following are understood:
+# d Don't diff stdout against the expected stdout.
+# D Don't diff stderr agsinst the expected stderr.
+# q All redirection lines given in the test script (not the lines
+# actually produced by the test) are subject to ordinary quoted shell
+# expansion (i.e. not globbing).
+# This can be followed by a `:' and a message describing the
+# test, which will be printed if the test fails, along with a
+# description of the failure that occurred. The `:' and message are
+# optional, but highly recommended.
+# Hence a complete status line looks something like:
+# 0dDq:Checking whether the world will end with a bang or a whimper
+#
+# If either or both of the '>' and '?' sets of lines is absent, it is
+# assumed the corresponding output should be empty and it is an error if it
+# is not. If '<' is empty, stdin is an empty (but opened) file.
+ cd cdtst.tmp/sub/fake &&
+ pwd &&
+ print $PWD
+0q:Preserving symbolic links in the current directory string
+>$mydir/cdtst.tmp/sub/fake
+>$mydir/cdtst.tmp/sub/fake
+
+ cd ../../.. &&
+ pwd &&
+ print $PWD
+0q:Changing directory up through symbolic links without following them
+>$mydir
+>$mydir
+
+ setopt chaselinks
+ cd cdtst.tmp/sub/fake &&
+ pwd &&
+ print $PWD
+0q:Resolving symbolic links with chaselinks set
+>$mydir/cdtst.tmp/real
+>$mydir/cdtst.tmp/real
+
+%clean
+# This optional section cleans up after the test, if necessary,
+# e.g. killing processes etc. This is in addition to the removal of *.tmp
+# subdirectories. This is essentially like %prep, except that status
+# return values are ignored.