Add a Sytest blacklist file (#849)

docs/sytest.md

@@ -2,16 +2,17 @@
 
 Dendrite uses [SyTest](https://github.com/matrix-org/sytest) for its
 integration testing. When creating a new PR, add the test IDs (see below) that
-your PR should allow to pass to `testfile` in dendrite's root directory. Not all
+your PR should allow to pass to `sytest-whitelist` in dendrite's root
-PRs need to make new tests pass. If we find your PR should be making a test pass
+directory. Not all PRs need to make new tests pass. If we find your PR should
-we may ask you to add to that file, as generally Dendrite's progress can be
+be making a test pass we may ask you to add to that file, as generally
-tracked through the amount of SyTest tests it passes.
+Dendrite's progress can be tracked through the amount of SyTest tests it
+passes.
 
 ## Finding out which tests to add
 
 We recommend you run the tests locally by manually setting up SyTest or using a
 SyTest docker image. After running the tests, a script will print the tests you
-need to add to `testfile` for you.
+need to add to `sytest-whitelist`.
 
 You should proceed after you see no build problems for dendrite after running:
 
@@ -50,16 +51,16 @@ EOF
 Run the tests:
 
 ```sh
-./run-tests.pl -I Dendrite::Monolith -d ../dendrite/bin -W ../dendrite/testfile -O tap --all | tee results.tap
+./run-tests.pl -I Dendrite::Monolith -d ../dendrite/bin -W ../dendrite/sytest-whitelist -O tap --all | tee results.tap
 ```
 
 where `tee` lets you see the results while they're being piped to the file.
 
 Once the tests are complete, run the helper script to see if you need to add
-any newly passing test names to `testfile` in the project's root directory:
+any newly passing test names to `sytest-whitelist` in the project's root directory:
 
 ```sh
-../dendrite/show-expected-fail-tests.sh results.tap ../dendrite/testfile
+../dendrite/show-expected-fail-tests.sh results.tap ../dendrite/sytest-whitelist ../dendrite/sytest-blacklist
 ```
 
 If the script prints nothing/exits with 0, then you're good to go.
@@ -75,4 +76,4 @@ docker run --rm -v /path/to/dendrite/:/src/ matrixdotorg/sytest-dendrite
 
 where `/path/to/dendrite/` should be replaced with the actual path to your
 dendrite source code. The output should tell you if you need to add any tests to
-`testfile`.
+`sytest-whitelist`.

show-expected-fail-tests.sh

@@ -1,45 +1,89 @@
 #! /bin/bash
+#
+# Parses a results.tap file from SyTest output and a file containing test names (a test whitelist)
+# and checks whether a test name that exists in the whitelist (that should pass), failed or not.
+#
+# An optional blacklist file can be added, also containing test names, where if a test name is
+# present, the script will not error even if the test is in the whitelist file and failed
+#
+# For each of these files, lines starting with '#' are ignored.
+#
+# Usage ./show-expected-fail-tests.sh results.tap whitelist [blacklist]
 
 results_file=$1
-testfile=$2
+whitelist_file=$2
+blacklist_file=$3
 
 fail_build=0
 
+if [ $# -lt 2 ]; then
+	echo "Usage: $0 results.tap whitelist [blacklist]"
+	exit 1
+fi
+
 if [ ! -f "$results_file" ]; then
-	echo "ERROR: Specified results file ${results_file} doesn't exist."
+	echo "ERROR: Specified results file '${results_file}' doesn't exist."
 	fail_build=1
 fi
 
-if [ ! -f "$testfile" ]; then
+if [ ! -f "$whitelist_file" ]; then
-	echo "ERROR: Specified testfile ${testfile} doesn't exist."
+	echo "ERROR: Specified test whitelist '${whitelist_file}' doesn't exist."
 	fail_build=1
 fi
 
+blacklisted_tests=()
+
+# Check if a blacklist file was provided
+if [ $# -eq 3 ]; then
+	# Read test blacklist file
+	if [ ! -f "$blacklist_file" ]; then
+		echo "ERROR: Specified test blacklist file '${blacklist_file}' doesn't exist."
+		fail_build=1
+	fi
+
+	# Read each line, ignoring those that start with '#'
+	blacklisted_tests=""
+	search_non_comments=$(grep -v '^#' ${blacklist_file})
+	while read -r line ; do
+		# Record the blacklisted test name
+		blacklisted_tests+=("${line}")
+	done <<< "${search_non_comments}"  # This allows us to edit blacklisted_tests in the while loop
+fi
+
 [ "$fail_build" = 0 ] || exit 1
 
 passed_but_expected_fail=$(grep ' # TODO passed but expected fail' ${results_file} | sed -E 's/^ok [0-9]+ (\(expected fail\) )?//' | sed -E 's/( \([0-9]+ subtests\))? # TODO passed but expected fail$//')
 tests_to_add=""
-already_in_testfile=""
+already_in_whitelist=""
 
-while read -r test_id; do
+while read -r test_name; do
-	[ "${test_id}" = "" ] && continue
+	# Ignore empty lines
-	grep "${test_id}" "${testfile}" > /dev/null 2>&1
+	[ "${test_name}" = "" ] && continue
+
+	grep "${test_name}" "${whitelist_file}" > /dev/null 2>&1
 	if [ "$?" != "0" ]; then
-		tests_to_add="${tests_to_add}${test_id}\n"
+		# Check if this test name is blacklisted
+		if printf '%s\n' "${blacklisted_tests[@]}" | grep -q -P "^${test_name}$"; then
+			# Don't notify about this test
+			continue
+		fi
+
+		# Append this test_name to the existing list
+		tests_to_add="${tests_to_add}${test_name}\n"
 		fail_build=1
 	else
-		already_in_testfile="${already_in_testfile}${test_id}\n"
+		already_in_whitelist="${already_in_whitelist}${test_name}\n"
 	fi
 done <<< "${passed_but_expected_fail}"
 
 if [ -n "${tests_to_add}" ]; then
-	echo "ERROR: The following passed tests are not present in testfile. Please append them to the file:"
+	echo "ERROR: The following passed tests are not present in $2. Please append them to the file:"
 	echo -e "${tests_to_add}"
 fi
 
-if [ -n "${already_in_testfile}" ]; then
+if [ -n "${already_in_whitelist}" ]; then
-	echo "WARN: Tests in testfile still marked as expected fail:"
+	echo "WARN: Tests in the whitelist still marked as expected fail:"
-	echo -e "${already_in_testfile}"
+	echo -e "${already_in_whitelist}"
 fi
 
 exit ${fail_build}

sytest-blacklist

@@ -0,0 +1,2 @@
+# Blacklisted due to flakiness
+Remote users can join room by alias