test: Improve layout of helper binaries

This patch moves the test helper binaries to a "one directory per
helper" layout, and also makes them to be ignored in the coverage build
instead of all builds.

With this change, "go build ./..." will build all binaries including the
test helpers, which helps make sure that module manage automation also
considers them. In particular, this makes "go mod tidy" work fine.

.gitignore

@@ -17,8 +17,15 @@ cmd/chasquid-util/chasquid-util
 cmd/smtp-check/smtp-check
 cmd/mda-lmtp/mda-lmtp
 cmd/dovecot-auth-cli/dovecot-auth-cli
-test/util/minidns
-test/util/fexp
+
+# Test util binaries.
+test/util/conngen/conngen
+test/util/coverhtml/coverhtml
+test/util/fexp/fexp
+test/util/generate_cert/generate_cert
+test/util/gocovcat/gocovcat
+test/util/loadgen/loadgen
+test/util/minidns/minidns
 
 # Test binary, generated during coverage tests.
 chasquid.test

test/Dockerfile

@@ -60,7 +60,7 @@ ENV GOPATH=
 RUN go get -v ${GO_GET_ARGS} ./... && go mod download
 
 # Build the minidns server, which will be run from within the entrypoint.
-RUN go build -o /tmp/minidns ./test/util/minidns.go
+RUN go build -o /tmp/minidns ./test/util/minidns/minidns.go
 USER root
 
 # Custom entry point, which uses our own DNS server.

test/cover.sh

@@ -27,7 +27,7 @@ export COVER_DIR="$PWD/.coverage"
 # the single-binary tests to fail: cross-package expvars confuse the expvarom
 # tests, which don't expect any expvars to exists besides the one registered
 # in the tests themselves.
-for pkg in $(go list ./... | grep -v chasquid/cmd/); do
+for pkg in $(go list ./... | grep -v -E 'chasquid/cmd/|chasquid/test'); do
 	OUT_FILE="$COVER_DIR/pkg-`echo $pkg | sed s+/+_+g`.out"
 	go test -tags coverage \
 		-covermode=count \
@@ -45,14 +45,14 @@ setsid -w ./cmd/dovecot-auth-cli/test.sh
 
 # Merge all coverage output into a single file.
 # Ignore protocol buffer-generated files, as they are not relevant.
-go run "${UTILDIR}/gocovcat.go" .coverage/*.out \
+go run "${UTILDIR}/gocovcat/gocovcat.go" .coverage/*.out \
 	| grep -v ".pb.go:" \
 	> .coverage/all.out
 
 # Generate reports based on the merged output.
 go tool cover -func="$COVER_DIR/all.out" | sort -k 3 -n > "$COVER_DIR/func.txt"
 go tool cover -html="$COVER_DIR/all.out" -o "$COVER_DIR/classic.html"
-go run "${UTILDIR}/coverhtml.go" \
+go run "${UTILDIR}/coverhtml/coverhtml.go" \
 	-input="$COVER_DIR/all.out"  -strip=3 \
 	-output="$COVER_DIR/coverage.html" \
 	-title="chasquid coverage report" \

test/util/conngen/conngen.go

@@ -1,5 +1,5 @@
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // SMTP connection generator, for testing purposes.
 package main

test/util/coverhtml/coverhtml.go

@@ -1,5 +1,5 @@
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // Generate an HTML visualization of a Go coverage profile.
 // Serves a similar purpose to "go tool cover -html", but has a different

test/util/fexp/fexp.go

@@ -1,5 +1,5 @@
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // Fetch an URL, and check if the response matches what we expect.
 //

test/util/generate_cert/generate_cert.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // Generate a self-signed X.509 certificate for a TLS server. Outputs to
 // 'cert.pem' and 'key.pem' and will overwrite existing files.

test/util/gocovcat/gocovcat.go

@@ -2,8 +2,8 @@
 //
 // From: https://git.lukeshu.com/go/cmd/gocovcat/
 //
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // Copyright 2017 Luke Shumaker <lukeshu@parabola.nu>
 //

test/util/lib.sh

@@ -101,26 +101,29 @@ function chamuyero() {
 }
 
 function generate_cert() {
-	go run ${UTILDIR}/generate_cert.go "$@"
+	( cd ${UTILDIR}/generate_cert/; go build )
+	${UTILDIR}/generate_cert/generate_cert "$@"
 }
 
 function loadgen() {
-	go run ${UTILDIR}/loadgen.go "$@"
+	( cd ${UTILDIR}/loadgen/; go build )
+	${UTILDIR}/loadgen/loadgen "$@"
 }
 
 function conngen() {
-	go run ${UTILDIR}/conngen.go "$@"
+	( cd ${UTILDIR}/conngen/; go build )
+	${UTILDIR}/conngen/conngen "$@"
 }
 
 function minidns_bg() {
-	( cd ${UTILDIR}; go build minidns.go )
-	${UTILDIR}/minidns "$@" &
+	( cd ${UTILDIR}/minidns; go build )
+	${UTILDIR}/minidns/minidns "$@" &
 	MINIDNS=$!
 }
 
 function fexp() {
-	( cd ${UTILDIR}; go build fexp.go )
-	${UTILDIR}/fexp "$@"
+	( cd ${UTILDIR}/fexp/; go build )
+	${UTILDIR}/fexp/fexp "$@"
 }
 
 function timeout() {

test/util/loadgen/loadgen.go

@@ -1,5 +1,5 @@
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // SMTP load generator, for testing purposes.
 package main

test/util/minidns/minidns.go

@@ -1,5 +1,5 @@
-//go:build ignore
-// +build ignore
+//go:build !coverage
+// +build !coverage
 
 // minidns is a trivial DNS server used for testing.
 //