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diff --git a/docs/development/coverage.md b/docs/development/coverage.md new file mode 100644 index 00000000..7a3b7cb9 --- /dev/null +++ b/docs/development/coverage.md @@ -0,0 +1,84 @@ +--- +title: Coverage +parent: Development +permalink: /development/coverage +--- + +To generate a test coverage report for Sytest, a small patch needs to be applied to the Sytest repository to compile and use the instrumented binary: +```patch +diff --git a/lib/SyTest/Homeserver/Dendrite.pm b/lib/SyTest/Homeserver/Dendrite.pm +index 8f0e209c..ad057e52 100644 +--- a/lib/SyTest/Homeserver/Dendrite.pm ++++ b/lib/SyTest/Homeserver/Dendrite.pm +@@ -337,7 +337,7 @@ sub _start_monolith + + $output->diag( "Starting monolith server" ); + my @command = ( +- $self->{bindir} . '/dendrite-monolith-server', ++ $self->{bindir} . '/dendrite-monolith-server', '--test.coverprofile=' . $self->{hs_dir} . '/integrationcover.log', "DEVEL", + '--config', $self->{paths}{config}, + '--http-bind-address', $self->{bind_host} . ':' . $self->unsecure_port, + '--https-bind-address', $self->{bind_host} . ':' . $self->secure_port, +diff --git a/scripts/dendrite_sytest.sh b/scripts/dendrite_sytest.sh +index f009332b..7ea79869 100755 +--- a/scripts/dendrite_sytest.sh ++++ b/scripts/dendrite_sytest.sh +@@ -34,7 +34,8 @@ export GOBIN=/tmp/bin + echo >&2 "--- Building dendrite from source" + cd /src + mkdir -p $GOBIN +-go install -v ./cmd/dendrite-monolith-server ++# go install -v ./cmd/dendrite-monolith-server ++go test -c -cover -covermode=atomic -o $GOBIN/dendrite-monolith-server -coverpkg "github.com/matrix-org/..." ./cmd/dendrite-monolith-server + go install -v ./cmd/generate-keys + cd - + ``` + + Then run Sytest. This will generate a new file `integrationcover.log` in each server's directory e.g `server-0/integrationcover.log`. To parse it, + ensure your working directory is under the Dendrite repository then run: + ```bash + go tool cover -func=/path/to/server-0/integrationcover.log + ``` + which will produce an output like: + ``` + ... + github.com/matrix-org/util/json.go:83: NewJSONRequestHandler 100.0% +github.com/matrix-org/util/json.go:90: Protect 57.1% +github.com/matrix-org/util/json.go:110: RequestWithLogging 100.0% +github.com/matrix-org/util/json.go:132: MakeJSONAPI 70.0% +github.com/matrix-org/util/json.go:151: respond 61.5% +github.com/matrix-org/util/json.go:180: WithCORSOptions 0.0% +github.com/matrix-org/util/json.go:191: SetCORSHeaders 100.0% +github.com/matrix-org/util/json.go:202: RandomString 100.0% +github.com/matrix-org/util/json.go:210: init 100.0% +github.com/matrix-org/util/unique.go:13: Unique 91.7% +github.com/matrix-org/util/unique.go:48: SortAndUnique 100.0% +github.com/matrix-org/util/unique.go:55: UniqueStrings 100.0% +total: (statements) 53.7% +``` +The total coverage for this run is the last line at the bottom. However, this value is misleading because Dendrite can run in many different configurations, +which will never be tested in a single test run (e.g sqlite or postgres, monolith or polylith). To get a more accurate value, additional processing is required +to remove packages which will never be tested and extension MSCs: +```bash +# These commands are all similar but change which package paths are _removed_ from the output. + +# For Postgres (monolith) +go tool cover -func=/path/to/server-0/integrationcover.log | grep 'github.com/matrix-org/dendrite' | grep -Ev 'inthttp|sqlite|setup/mscs|api_trace' > coverage.txt + +# For Postgres (polylith) +go tool cover -func=/path/to/server-0/integrationcover.log | grep 'github.com/matrix-org/dendrite' | grep -Ev 'sqlite|setup/mscs|api_trace' > coverage.txt + +# For SQLite (monolith) +go tool cover -func=/path/to/server-0/integrationcover.log | grep 'github.com/matrix-org/dendrite' | grep -Ev 'inthttp|postgres|setup/mscs|api_trace' > coverage.txt + +# For SQLite (polylith) +go tool cover -func=/path/to/server-0/integrationcover.log | grep 'github.com/matrix-org/dendrite' | grep -Ev 'postgres|setup/mscs|api_trace' > coverage.txt +``` + +A total value can then be calculated using: +```bash +cat coverage.txt | awk -F '\t+' '{x = x + $3} END {print x/NR}' +``` + + +We currently do not have a way to combine Sytest/Complement/Unit Tests into a single coverage report.
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