diff --git a/test/sharness.sh b/test/sharness.sh
index 7395be4..86d4a30 100644
--- a/test/sharness.sh
+++ b/test/sharness.sh
@@ -18,33 +18,73 @@
 # along with this program.  If not, see http://www.gnu.org/licenses/ .
 
 # Public: Current version of Sharness.
-SHARNESS_VERSION="0.3.0"
+SHARNESS_VERSION="1.1.0"
 export SHARNESS_VERSION
 
 # Public: The file extension for tests.  By default, it is set to "t".
-: ${SHARNESS_TEST_EXTENSION:=t}
+: "${SHARNESS_TEST_EXTENSION:=t}"
 export SHARNESS_TEST_EXTENSION
 
-# Keep the original TERM for say_color
-ORIGINAL_TERM=$TERM
+# Public: Root directory containing tests. Tests can override this variable,
+# e.g. for testing Sharness itself.
+if test -z "$SHARNESS_TEST_DIRECTORY"
+then
+	SHARNESS_TEST_DIRECTORY=$(pwd)
+else
+	# ensure that SHARNESS_TEST_DIRECTORY is an absolute path so that it
+	# is valid even if the current working directory is changed
+	SHARNESS_TEST_DIRECTORY=$(cd "$SHARNESS_TEST_DIRECTORY" && pwd) || exit 1
+fi
+export SHARNESS_TEST_DIRECTORY
+
+#  Reset TERM to original terminal if found, otherwise save original TERM
+[ "x" = "x$SHARNESS_ORIG_TERM" ] &&
+		SHARNESS_ORIG_TERM="$TERM" ||
+		TERM="$SHARNESS_ORIG_TERM"
+# Public: The unsanitized TERM under which sharness is originally run
+export SHARNESS_ORIG_TERM
+
+# Export SHELL_PATH
+: "${SHELL_PATH:=$SHELL}"
+export SHELL_PATH
+
+# if --tee was passed, write the output not only to the terminal, but
+# additionally to the file test-results/$BASENAME.out, too.
+case "$SHARNESS_TEST_TEE_STARTED, $* " in
+done,*)
+	# do not redirect again
+	;;
+*' --tee '*|*' --verbose-log '*)
+	mkdir -p "$SHARNESS_TEST_DIRECTORY/test-results"
+	BASE="$SHARNESS_TEST_DIRECTORY/test-results/$(basename "$0" ".$SHARNESS_TEST_EXTENSION")"
+
+	# Make this filename available to the sub-process in case it is using
+	# --verbose-log.
+	SHARNESS_TEST_TEE_OUTPUT_FILE="$BASE.out"
+	export SHARNESS_TEST_TEE_OUTPUT_FILE
+
+	# Truncate before calling "tee -a" to get rid of the results
+	# from any previous runs.
+	: >"$SHARNESS_TEST_TEE_OUTPUT_FILE"
+
+	(SHARNESS_TEST_TEE_STARTED="done" ${SHELL_PATH} "$0" "$@" 2>&1;
+	 echo $? >"$BASE.exit") | tee -a "$SHARNESS_TEST_TEE_OUTPUT_FILE"
+	test "$(cat "$BASE.exit")" = 0
+	exit
+	;;
+esac
 
 # For repeatability, reset the environment to a known state.
+# TERM is sanitized below, after saving color control sequences.
 LANG=C
 LC_ALL=C
-PAGER=cat
+PAGER="cat"
 TZ=UTC
-TERM=dumb
 EDITOR=:
-export LANG LC_ALL PAGER TZ TERM EDITOR
+export LANG LC_ALL PAGER TZ EDITOR
 unset VISUAL CDPATH GREP_OPTIONS
 
-# Line feed
-LF='
-'
-
-[ "x$ORIGINAL_TERM" != "xdumb" ] && (
-		TERM=$ORIGINAL_TERM &&
-		export TERM &&
+[ "x$TERM" != "xdumb" ] && (
 		[ -t 1 ] &&
 		tput bold >/dev/null 2>&1 &&
 		tput setaf 1 >/dev/null 2>&1 &&
@@ -60,6 +100,8 @@ while test "$#" -ne 0; do
 		immediate=t; shift ;;
 	-l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 		TEST_LONG=t; export TEST_LONG; shift ;;
+	--in|--int|--inte|--inter|--intera|--interac|--interact|--interacti|--interactiv|--interactive|--interactive-|--interactive-t|--interactive-te|--interactive-tes|--interactive-test|--interactive-tests):
+		TEST_INTERACTIVE=t; export TEST_INTERACTIVE; verbose=t; shift ;;
 	-h|--h|--he|--hel|--help)
 		help=t; shift ;;
 	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
@@ -68,49 +110,69 @@ while test "$#" -ne 0; do
 		# Ignore --quiet under a TAP::Harness. Saying how many tests
 		# passed without the ok/not ok details is always an error.
 		test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
+	--chain-lint)
+		chain_lint=t; shift ;;
+	--no-chain-lint)
+		chain_lint=; shift ;;
 	--no-color)
 		color=; shift ;;
+	--tee)
+		shift ;; # was handled already
 	--root=*)
 		root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 		shift ;;
+	--verbose-log)
+		verbose_log=t
+		shift ;;
 	*)
 		echo "error: unknown test option '$1'" >&2; exit 1 ;;
 	esac
 done
 
 if test -n "$color"; then
+	# Save the color control sequences now rather than run tput
+	# each time say_color() is called.  This is done for two
+	# reasons:
+	#   * TERM will be changed to dumb
+	#   * HOME will be changed to a temporary directory and tput
+	#     might need to read ~/.terminfo from the original HOME
+	#     directory to get the control sequences
+	# Note:  This approach assumes the control sequences don't end
+	# in a newline for any terminal of interest (command
+	# substitutions strip trailing newlines).  Given that most
+	# (all?) terminals in common use are related to ECMA-48, this
+	# shouldn't be a problem.
+	say_color_error=$(tput bold; tput setaf 1) # bold red
+	say_color_skip=$(tput setaf 4) # blue
+	say_color_warn=$(tput setaf 3) # brown/yellow
+	say_color_pass=$(tput setaf 2) # green
+	say_color_info=$(tput setaf 6) # cyan
+	say_color_reset=$(tput sgr0)
+	say_color_raw="" # no formatting for normal text
 	say_color() {
-		(
-		TERM=$ORIGINAL_TERM
-		export TERM
+		test -z "$1" && test -n "$quiet" && return
 		case "$1" in
-		error)
-			tput bold; tput setaf 1;; # bold red
-		skip)
-			tput setaf 4;; # blue
-		warn)
-			tput setaf 3;; # brown/yellow
-		pass)
-			tput setaf 2;; # green
-		info)
-			tput setaf 6;; # cyan
-		*)
-			test -n "$quiet" && return;;
+			error) say_color_color=$say_color_error ;;
+			skip) say_color_color=$say_color_skip ;;
+			warn) say_color_color=$say_color_warn ;;
+			pass) say_color_color=$say_color_pass ;;
+			info) say_color_color=$say_color_info ;;
+			*) say_color_color=$say_color_raw ;;
 		esac
 		shift
-		printf "%s" "$*"
-		tput sgr0
-		echo
-		)
+		printf '%s%s%s\n' "$say_color_color" "$*" "$say_color_reset"
 	}
 else
 	say_color() {
 		test -z "$1" && test -n "$quiet" && return
 		shift
-		printf "%s\n" "$*"
+		printf '%s\n' "$*"
 	}
 fi
 
+TERM=dumb
+export TERM
+
 error() {
 	say_color error "error: $*"
 	EXIT_OK=t
@@ -121,7 +183,7 @@ say() {
 	say_color info "$*"
 }
 
-test -n "$test_description" || error "Test script did not set test_description."
+test -n "${test_description:-}" || error "Test script did not set test_description."
 
 if test "$help" = "t"; then
 	echo "$test_description"
@@ -130,7 +192,11 @@ fi
 
 exec 5>&1
 exec 6<&0
-if test "$verbose" = "t"; then
+if test "$verbose_log" = "t"
+then
+	exec 3>>"$SHARNESS_TEST_TEE_OUTPUT_FILE" 4>&3
+elif test "$verbose" = "t"
+then
 	exec 4>&2 3>&1
 else
 	exec 4>/dev/null 3>/dev/null
@@ -161,7 +227,7 @@ trap 'die' EXIT
 # implicitly by specifying the prerequisite name in calls to test_expect_success
 # or test_expect_failure.
 #
-# $1 - Name of prerequiste (a simple word, in all capital letters by convention)
+# $1 - Name of prerequisite (a simple word, in all capital letters by convention)
 #
 # Examples
 #
@@ -198,7 +264,7 @@ test_have_prereq() {
 	# prerequisites can be concatenated with ','
 	save_IFS=$IFS
 	IFS=,
-	set -- $*
+	set -- $@
 	IFS=$save_IFS
 
 	total_prereq=0
@@ -215,7 +281,7 @@ test_have_prereq() {
 			negative_prereq=
 		esac
 
-		total_prereq=$(($total_prereq + 1))
+		total_prereq=$((total_prereq + 1))
 		case "$satisfied_prereq" in
 		*" $prerequisite "*)
 			satisfied_this_prereq=t
@@ -226,7 +292,7 @@ test_have_prereq() {
 
 		case "$satisfied_this_prereq,$negative_prereq" in
 		t,|,t)
-			ok_prereq=$(($ok_prereq + 1))
+			ok_prereq=$((ok_prereq + 1))
 			;;
 		*)
 			# Keep a list of missing prerequisites; restore
@@ -247,12 +313,12 @@ test_have_prereq() {
 # the text_expect_* functions instead.
 
 test_ok_() {
-	test_success=$(($test_success + 1))
-	say_color "" "ok $test_count - $@"
+	test_success=$((test_success + 1))
+	say_color "" "ok $test_count - $*"
 }
 
 test_failure_() {
-	test_failure=$(($test_failure + 1))
+	test_failure=$((test_failure + 1))
 	say_color error "not ok $test_count - $1"
 	shift
 	echo "$@" | sed -e 's/^/#	/'
@@ -260,13 +326,13 @@ test_failure_() {
 }
 
 test_known_broken_ok_() {
-	test_fixed=$(($test_fixed + 1))
-	say_color error "ok $test_count - $@ # TODO known breakage vanished"
+	test_fixed=$((test_fixed + 1))
+	say_color error "ok $test_count - $* # TODO known breakage vanished"
 }
 
 test_known_broken_failure_() {
-	test_broken=$(($test_broken + 1))
-	say_color warn "not ok $test_count - $@ # TODO known breakage"
+	test_broken=$((test_broken + 1))
+	say_color warn "not ok $test_count - $* # TODO known breakage"
 }
 
 # Public: Execute commands in debug mode.
@@ -287,10 +353,29 @@ test_debug() {
 	test "$debug" = "" || eval "$1"
 }
 
+# Public: Stop execution and start a shell.
+#
+# This is useful for debugging tests and only makes sense together with "-v".
+# Be sure to remove all invocations of this command before submitting.
+test_pause() {
+	if test "$verbose" = t; then
+		"$SHELL_PATH" <&6 >&3 2>&4
+	else
+		error >&5 "test_pause requires --verbose"
+	fi
+}
+
 test_eval_() {
 	# This is a separate function because some tests use
 	# "return" to end a test_expect_success block early.
-	eval </dev/null >&3 2>&4 "$*"
+	case ",$test_prereq," in
+	*,INTERACTIVE,*)
+		eval "$*"
+		;;
+	*)
+		eval </dev/null >&3 2>&4 "$*"
+		;;
+	esac
 }
 
 test_run_() {
@@ -299,6 +384,13 @@ test_run_() {
 	test_eval_ "$1"
 	eval_ret=$?
 
+	if test "$chain_lint" = "t"; then
+		test_eval_ "(exit 117) && $1"
+		if test "$?" != 117; then
+			error "bug in the test script: broken &&-chain: $1"
+		fi
+	fi
+
 	if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"; then
 		test_eval_ "$test_cleanup"
 	fi
@@ -309,7 +401,7 @@ test_run_() {
 }
 
 test_skip_() {
-	test_count=$(($test_count + 1))
+	test_count=$((test_count + 1))
 	to_skip=
 	for skp in $SKIP_TESTS; do
 		case $this_test.$test_count in
@@ -328,7 +420,7 @@ test_skip_() {
 			of_prereq=" of $test_prereq"
 		fi
 
-		say_color skip >&3 "skipping test: $@"
+		say_color skip >&3 "skipping test: $*"
 		say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
 		: true
 		;;
@@ -426,6 +518,44 @@ test_expect_failure() {
 	echo >&3 ""
 }
 
+# Public: Run test commands and expect anything from them. Used when a
+# test is not stable or not finished for some reason.
+#
+# When the test passed, an "ok" message is printed, but the number of
+# fixed tests is not incremented.
+#
+# When it failed, a "not ok ... # TODO known breakage" message is
+# printed, and the number of tests still broken is incremented.
+#
+# Failures from these tests won't cause --immediate to stop.
+#
+# Usually takes two arguments:
+# $1 - Test description
+# $2 - Commands to be executed.
+#
+# With three arguments, the first will be taken to be a prerequisite:
+# $1 - Comma-separated list of test prerequisites. The test will be skipped if
+#      not all of the given prerequisites are set. To negate a prerequisite,
+#      put a "!" in front of it.
+# $2 - Test description
+# $3 - Commands to be executed.
+#
+# Returns nothing.
+test_expect_unstable() {
+	test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
+	test "$#" = 2 || error "bug in the test script: not 2 or 3 parameters to test_expect_unstable"
+	export test_prereq
+	if ! test_skip_ "$@"; then
+		say >&3 "checking unstable test: $2"
+		if test_run_ "$2" unstable; then
+			test_ok_ "$1"
+		else
+			test_known_broken_failure_ "$1"
+		fi
+	fi
+	echo >&3 ""
+}
+
 # Public: Run command and ensure that it fails in a controlled way.
 #
 # Use it instead of "! <command>". For example, when <command> dies due to a
@@ -518,7 +648,7 @@ test_expect_code() {
 	shift
 	"$@"
 	exit_code=$?
-	if test $exit_code = $want_code; then
+	if test "$exit_code" = "$want_code"; then
 		return 0
 	fi
 
@@ -528,7 +658,7 @@ test_expect_code() {
 
 # Public: Compare two files to see if expected output matches actual output.
 #
-# The TEST_CMP variable defines the command used for the comparision; it
+# The TEST_CMP variable defines the command used for the comparison; it
 # defaults to "diff -u". Only when the test script was started with --verbose,
 # will the command's output, the diff, be printed to the standard output.
 #
@@ -551,6 +681,79 @@ test_cmp() {
 	${TEST_CMP:-diff -u} "$@"
 }
 
+# Public: portably print a sequence of numbers.
+#
+# seq is not in POSIX and GNU seq might not be available everywhere,
+# so it is nice to have a seq implementation, even a very simple one.
+#
+# $1 - Starting number.
+# $2 - Ending number.
+#
+# Examples
+#
+#   test_expect_success 'foo works 10 times' '
+#       for i in $(test_seq 1 10)
+#       do
+#           foo || return
+#       done
+#   '
+#
+# Returns 0 if all the specified numbers can be displayed.
+test_seq() {
+	i="$1"
+	j="$2"
+	while test "$i" -le "$j"
+	do
+		echo "$i" || return
+		i=$(("$i" + 1))
+	done
+}
+
+# Public: Check if the file expected to be empty is indeed empty, and barfs
+# otherwise.
+#
+# $1 - File to check for emptiness.
+#
+# Returns 0 if file is empty, 1 otherwise.
+test_must_be_empty() {
+	if test -s "$1"
+	then
+		echo "'$1' is not empty, it contains:"
+		cat "$1"
+		return 1
+	fi
+}
+
+# debugging-friendly alternatives to "test [-f|-d|-e]"
+# The commands test the existence or non-existence of $1. $2 can be
+# given to provide a more precise diagnosis.
+test_path_is_file () {
+	if ! test -f "$1"
+	then
+		echo "File $1 doesn't exist. $2"
+		false
+	fi
+}
+
+test_path_is_dir () {
+	if ! test -d "$1"
+	then
+		echo "Directory $1 doesn't exist. $2"
+		false
+	fi
+}
+
+# Check if the directory exists and is empty as expected, barf otherwise.
+test_dir_is_empty () {
+	test_path_is_dir "$1" &&
+	if test -n "$(find "$1" -mindepth 1 -maxdepth 1)"
+	then
+		echo "Directory '$1' is not empty, it contains:"
+		ls -la "$1"
+		return 1
+	fi
+}
+
 # Public: Schedule cleanup commands to be run unconditionally at the end of a
 # test.
 #
@@ -576,6 +779,23 @@ test_when_finished() {
 		} && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 }
 
+# Public: Schedule cleanup commands to be run unconditionally when all tests
+# have run.
+#
+# This can be used to clean up things like test databases. It is not needed to
+# clean up temporary files, as test_done already does that.
+#
+# Examples:
+#
+#   cleanup mysql -e "DROP DATABASE mytest"
+#
+# Returns the exit code of the last cleanup command executed.
+final_cleanup=
+cleanup() {
+	final_cleanup="{ $*
+		} && (exit \"\$eval_ret\"); eval_ret=\$?; $final_cleanup"
+}
+
 # Public: Summarize test results and exit with an appropriate error code.
 #
 # Must be called at the end of each test script.
@@ -602,7 +822,7 @@ test_done() {
 	if test -z "$HARNESS_ACTIVE"; then
 		test_results_dir="$SHARNESS_TEST_DIRECTORY/test-results"
 		mkdir -p "$test_results_dir"
-		test_results_path="$test_results_dir/${SHARNESS_TEST_FILE%.$SHARNESS_TEST_EXTENSION}.$$.counts"
+		test_results_path="$test_results_dir/$this_test.$$.counts"
 
 		cat >>"$test_results_path" <<-EOF
 		total $test_count
@@ -621,7 +841,7 @@ test_done() {
 		say_color warn "# still have $test_broken known breakage(s)"
 	fi
 	if test "$test_broken" != 0 || test "$test_fixed" != 0; then
-		test_remaining=$(( $test_count - $test_broken - $test_fixed ))
+		test_remaining=$((test_count - test_broken - test_fixed))
 		msg="remaining $test_remaining test(s)"
 	else
 		test_remaining=$test_count
@@ -641,6 +861,8 @@ test_done() {
 		fi
 		say "1..$test_count$skip_all"
 
+		test_eval_ "$final_cleanup"
+
 		test -d "$remove_trash" &&
 		cd "$(dirname "$remove_trash")" &&
 		rm -rf "$(basename "$remove_trash")"
@@ -656,14 +878,15 @@ test_done() {
 	esac
 }
 
-# Public: Root directory containing tests. Tests can override this variable,
-# e.g. for testing Sharness itself.
-: ${SHARNESS_TEST_DIRECTORY:=$(pwd)}
-export SHARNESS_TEST_DIRECTORY
+# Public: Source directory of test code and sharness library.
+# This directory may be different from the directory in which tests are
+# being run.
+: "${SHARNESS_TEST_SRCDIR:=$(cd "$(dirname "$0")" && pwd)}"
+export SHARNESS_TEST_SRCDIR
 
 # Public: Build directory that will be added to PATH. By default, it is set to
 # the parent directory of SHARNESS_TEST_DIRECTORY.
-: ${SHARNESS_BUILD_DIRECTORY:="$SHARNESS_TEST_DIRECTORY/.."}
+: "${SHARNESS_BUILD_DIRECTORY:="$SHARNESS_TEST_DIRECTORY/.."}"
 PATH="$SHARNESS_BUILD_DIRECTORY:$PATH"
 export PATH SHARNESS_BUILD_DIRECTORY
 
@@ -672,19 +895,43 @@ SHARNESS_TEST_FILE="$0"
 export SHARNESS_TEST_FILE
 
 # Prepare test area.
-test_dir="trash directory.$(basename "$SHARNESS_TEST_FILE" ".$SHARNESS_TEST_EXTENSION")"
-test -n "$root" && test_dir="$root/$test_dir"
-case "$test_dir" in
-/*) SHARNESS_TRASH_DIRECTORY="$test_dir" ;;
- *) SHARNESS_TRASH_DIRECTORY="$SHARNESS_TEST_DIRECTORY/$test_dir" ;;
+SHARNESS_TRASH_DIRECTORY="trash directory.$(basename "$SHARNESS_TEST_FILE" ".$SHARNESS_TEST_EXTENSION")"
+test -n "$root" && SHARNESS_TRASH_DIRECTORY="$root/$SHARNESS_TRASH_DIRECTORY"
+case "$SHARNESS_TRASH_DIRECTORY" in
+/*) ;; # absolute path is good
+ *) SHARNESS_TRASH_DIRECTORY="$SHARNESS_TEST_DIRECTORY/$SHARNESS_TRASH_DIRECTORY" ;;
 esac
 test "$debug" = "t" || remove_trash="$SHARNESS_TRASH_DIRECTORY"
-rm -rf "$test_dir" || {
+rm -rf "$SHARNESS_TRASH_DIRECTORY" || {
 	EXIT_OK=t
 	echo >&5 "FATAL: Cannot prepare test area"
 	exit 1
 }
 
+
+#
+#  Load any extensions in $srcdir/sharness.d/*.sh
+#
+if test -d "${SHARNESS_TEST_SRCDIR}/sharness.d"
+then
+	for file in "${SHARNESS_TEST_SRCDIR}"/sharness.d/*.sh
+	do
+		# Ensure glob was not an empty match:
+		test -e "${file}" || break
+
+		if test -n "$debug"
+		then
+			echo >&5 "sharness: loading extensions from ${file}"
+		fi
+		. "${file}"
+		if test $? != 0
+		then
+			echo >&5 "sharness: Error loading ${file}. Aborting."
+			exit 1
+		fi
+	done
+fi
+
 # Public: Empty trash directory, the test area, provided for each test. The HOME
 # variable is set to that directory too.
 export SHARNESS_TRASH_DIRECTORY
@@ -692,10 +939,10 @@ export SHARNESS_TRASH_DIRECTORY
 HOME="$SHARNESS_TRASH_DIRECTORY"
 export HOME
 
-mkdir -p "$test_dir" || exit 1
+mkdir -p "$SHARNESS_TRASH_DIRECTORY" || exit 1
 # Use -P to resolve symlinks in our working directory so that the cwd
 # in subprocesses like git equals our $PWD (for pathname comparisons).
-cd -P "$test_dir" || exit 1
+cd -P "$SHARNESS_TRASH_DIRECTORY" || exit 1
 
 this_test=${SHARNESS_TEST_FILE##*/}
 this_test=${this_test%.$SHARNESS_TEST_EXTENSION}
@@ -708,4 +955,10 @@ for skp in $SKIP_TESTS; do
 	esac
 done
 
+test -n "$TEST_LONG" && test_set_prereq EXPENSIVE
+test -n "$TEST_INTERACTIVE" && test_set_prereq INTERACTIVE
+
+# Make sure this script ends with code 0
+:
+
 # vi: set ts=4 sw=4 noet :