feat(router): hot config reloading

router-tests/go.mod

@@ -44,6 +44,7 @@ require (
 	dario.cat/mergo v1.0.0 // indirect
 	github.com/99designs/gqlgen v0.17.63 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 // indirect
+	github.com/KimMachineGun/automemlimit v0.6.1 // indirect
 	github.com/MicahParks/keyfunc/v3 v3.3.5 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect
@@ -54,7 +55,10 @@ require (
 	github.com/caarlos0/env/v11 v11.3.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cilium/ebpf v0.16.0 // indirect
+	github.com/containerd/cgroups/v3 v3.0.2 // indirect
 	github.com/containerd/continuity v0.4.5 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.5 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/dgraph-io/ristretto/v2 v2.1.0 // indirect
@@ -78,6 +82,7 @@ require (
 	github.com/gobwas/ws v1.4.0 // indirect
 	github.com/goccy/go-json v0.10.3 // indirect
 	github.com/goccy/go-yaml v1.17.1 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
@@ -88,7 +93,6 @@ require (
 	github.com/iancoleman/strcase v0.3.0 // indirect
 	github.com/jensneuse/abstractlogger v0.0.4 // indirect
 	github.com/jensneuse/byte-template v0.0.0-20231025215717-69252eb3ed56 // indirect
-	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/kingledion/go-tools v0.6.0 // indirect
 	github.com/klauspost/compress v1.17.9 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
@@ -108,6 +112,8 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.0 // indirect
 	github.com/opencontainers/runc v1.2.3 // indirect
+	github.com/opencontainers/runtime-spec v1.2.0 // indirect
+	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
 	github.com/phf/go-queue v0.0.0-20170504031614-9abe38d0371d // indirect
 	github.com/pierrec/lz4/v4 v4.1.21 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
@@ -153,6 +159,7 @@ require (
 	go.opentelemetry.io/otel/exporters/prometheus v0.50.0 // indirect
 	go.opentelemetry.io/otel/metric v1.28.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.1.0 // indirect
+	go.uber.org/automaxprocs v1.5.3 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/ratelimit v0.3.1 // indirect
 	go.withmatt.com/connect-brotli v0.4.0 // indirect

router-tests/go.sum

@@ -9,6 +9,8 @@ github.com/99designs/gqlgen v0.17.63/go.mod h1:sVCM2iwIZisJjTI/DEC3fpH+HFgxY1496
 github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 h1:L/gRVlceqvL25UVaW/CKtUDjefjrs0SPonmDGUVOYP0=
 github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/KimMachineGun/automemlimit v0.6.1 h1:ILa9j1onAAMadBsyyUJv5cack8Y1WT26yLj/V+ulKp8=
+github.com/KimMachineGun/automemlimit v0.6.1/go.mod h1:T7xYht7B8r6AG/AqFcUdc7fzd2bIdBKmepfP2S1svPY=
 github.com/MicahParks/jwkset v0.9.0 h1:xDlGu6mZJdJ+mgAI4mIRqWm2p8Vrx0U98LMgRObw46M=
 github.com/MicahParks/jwkset v0.9.0/go.mod h1:fVrj6TmG1aKlJEeceAz7JsXGTXEn72zP1px3us53JrA=
 github.com/MicahParks/keyfunc/v3 v3.3.5 h1:7ceAJLUAldnoueHDNzF8Bx06oVcQ5CfJnYwNt1U3YYo=
@@ -49,12 +51,18 @@ github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK3
 github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cilium/ebpf v0.16.0 h1:+BiEnHL6Z7lXnlGUsXQPPAE7+kenAd4ES8MQ5min0Ok=
+github.com/cilium/ebpf v0.16.0/go.mod h1:L7u2Blt2jMM/vLAVgjxluxtBKlz3/GWjB0dMOEngfwE=
 github.com/cloudflare/backoff v0.0.0-20240920015135-e46b80a3a7d0 h1:pRcxfaAlK0vR6nOeQs7eAEvjJzdGXl8+KaBlcvpQTyQ=
 github.com/cloudflare/backoff v0.0.0-20240920015135-e46b80a3a7d0/go.mod h1:rzgs2ZOiguV6/NpiDgADjRLPNyZlApIWxKpkT+X8SdY=
 github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
 github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
+github.com/containerd/cgroups/v3 v3.0.2 h1:f5WFqIVSgo5IZmtTT3qVBo6TzI1ON6sycSBKkymb9L0=
+github.com/containerd/cgroups/v3 v3.0.2/go.mod h1:JUgITrzdFqp42uI2ryGA+ge0ap/nxzYgkGmIcetmErE=
 github.com/containerd/continuity v0.4.5 h1:ZRoN1sXq9u7V6QoHMcVWGhOwDFqZ4B9i5H6un1Wh0x4=
 github.com/containerd/continuity v0.4.5/go.mod h1:/lNJvtJKUQStBzpVQ1+rasXO1LAWtUQssk28EZvJ3nE=
+github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/cpuguy83/go-md2man/v2 v2.0.5 h1:ZtcqGrnekaHpVLArFSe4HK5DoKx1T0rq2DwVB0alcyc=
 github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
@@ -102,6 +110,8 @@ github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
 github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/go-quicktest/qt v1.101.0 h1:O1K29Txy5P2OK0dGo59b7b0LR6wKfIhttaAhHUyn7eI=
+github.com/go-quicktest/qt v1.101.0/go.mod h1:14Bz/f7NwaXPtdYEgzsx46kqSxVwTbzVZsDC26tQJow=
 github.com/go-redis/redis_rate/v10 v10.0.1 h1:calPxi7tVlxojKunJwQ72kwfozdy25RjA0bCj1h0MUo=
 github.com/go-redis/redis_rate/v10 v10.0.1/go.mod h1:EMiuO9+cjRkR7UvdvwMO7vbgqJkltQHtwbdIQvaBKIU=
 github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
@@ -118,6 +128,9 @@ github.com/goccy/go-json v0.10.3 h1:KZ5WoDbxAIgm2HNbYckL0se1fHD6rz5j4ywS6ebzDqA=
 github.com/goccy/go-json v0.10.3/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
 github.com/goccy/go-yaml v1.17.1 h1:LI34wktB2xEE3ONG/2Ar54+/HJVBriAGJ55PHls4YuY=
 github.com/goccy/go-yaml v1.17.1/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
+github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
@@ -164,8 +177,10 @@ github.com/jensneuse/byte-template v0.0.0-20231025215717-69252eb3ed56 h1:wo26fh6
 github.com/jensneuse/byte-template v0.0.0-20231025215717-69252eb3ed56/go.mod h1:0D5r/VSW6D/o65rKLL9xk7sZxL2+oku2HvFPYeIMFr4=
 github.com/jensneuse/diffview v1.0.0 h1:4b6FQJ7y3295JUHU3tRko6euyEboL825ZsXeZZM47Z4=
 github.com/jensneuse/diffview v1.0.0/go.mod h1:i6IacuD8LnEaPuiyzMHA+Wfz5mAuycMOf3R/orUY9y4=
-github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
-github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
+github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
+github.com/jsimonetti/rtnetlink/v2 v2.0.1 h1:xda7qaHDSVOsADNouv7ukSuicKZO7GgVUCXxpaIEIlM=
+github.com/jsimonetti/rtnetlink/v2 v2.0.1/go.mod h1:7MoNYNbb3UaDHtF8udiJo/RH6VsTKP1pqKLUTVCvToE=
 github.com/kingledion/go-tools v0.6.0 h1:y8C/4mWoHgLkO45dB+Y/j0o4Y4WUB5lDTAcMPMtFpTg=
 github.com/kingledion/go-tools v0.6.0/go.mod h1:qcDJQxBui/H/hterGb90GMlLs9Yi7QrwaJL8OGdbsms=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
@@ -198,6 +213,10 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mdlayher/netlink v1.7.2 h1:/UtM3ofJap7Vl4QWCPDGXY8d3GIY2UGSDbK+QWmY8/g=
+github.com/mdlayher/netlink v1.7.2/go.mod h1:xraEF7uJbxLhc5fpHL4cPe221LI2bdttWlU+ZGLfQSw=
+github.com/mdlayher/socket v0.4.1 h1:eM9y2/jlbs1M615oshPQOHZzj6R6wMT7bX5NPiQvn2U=
+github.com/mdlayher/socket v0.4.1/go.mod h1:cAqeGjoufqdxWkD7DkpyS+wcefOtmu5OQ8KuoJGIReA=
 github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
 github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
 github.com/minio/minio-go/v7 v7.0.74 h1:fTo/XlPBTSpo3BAMshlwKL5RspXRv9us5UeHEGYCFe0=
@@ -224,8 +243,12 @@ github.com/opencontainers/image-spec v1.1.0 h1:8SG7/vwALn54lVB/0yZ/MMwhFrPYtpEHQ
 github.com/opencontainers/image-spec v1.1.0/go.mod h1:W4s4sFTMaBeK1BQLXbG4AdM2szdn85PY75RI83NrTrM=
 github.com/opencontainers/runc v1.2.3 h1:fxE7amCzfZflJO2lHXf4y/y8M1BoAqp+FVmG19oYB80=
 github.com/opencontainers/runc v1.2.3/go.mod h1:nSxcWUydXrsBZVYNSkTjoQ/N6rcyTtn+1SD5D4+kRIM=
+github.com/opencontainers/runtime-spec v1.2.0 h1:z97+pHb3uELt/yiAWD691HNHQIF07bE7dzrbT927iTk=
+github.com/opencontainers/runtime-spec v1.2.0/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
 github.com/ory/dockertest/v3 v3.12.0 h1:3oV9d0sDzlSQfHtIaB5k6ghUCVMVLpAY8hwrqoCyRCw=
 github.com/ory/dockertest/v3 v3.12.0/go.mod h1:aKNDTva3cp8dwOWwb9cWuX84aH5akkxXRvO7KCwWVjE=
+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 h1:onHthvaw9LFnH4t2DcNVpwGmV9E1BkGknEliJkfwQj0=
+github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58/go.mod h1:DXv8WO4yhMYhSNPKjeNKa5WY9YCIEBRbNzFFPJbWO6Y=
 github.com/phf/go-queue v0.0.0-20170504031614-9abe38d0371d h1:U+PMnTlV2tu7RuMK5etusZG3Cf+rpow5hqQByeCzJ2g=
 github.com/phf/go-queue v0.0.0-20170504031614-9abe38d0371d/go.mod h1:lXfE4PvvTW5xOjO6Mba8zDPyw8M93B6AQ7frTGnMlA8=
 github.com/pierrec/lz4/v4 v4.1.21 h1:yOVMLb6qSIDP67pl/5F7RepeKYu/VmTyEXvuMI5d9mQ=
@@ -240,6 +263,8 @@ github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c h1:ncq/mPwQF
 github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
 github.com/pquerna/cachecontrol v0.2.0 h1:vBXSNuE5MYP9IJ5kjsdo8uq+w41jSPgvba2DEnkRx9k=
 github.com/pquerna/cachecontrol v0.2.0/go.mod h1:NrUG3Z7Rdu85UNR3vm7SOsl1nFIeSiQnrHV5K9mBcUI=
+github.com/prashantv/gostub v1.1.0 h1:BTyx3RfQjRHnUWaGF9oQos79AlQ5k8WNktv7VGvVH4g=
+github.com/prashantv/gostub v1.1.0/go.mod h1:A5zLQHz7ieHGG7is6LLXLz7I8+3LZzsrV0P1IAHhP5U=
 github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
 github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
@@ -377,6 +402,8 @@ go.opentelemetry.io/proto/otlp v1.1.0/go.mod h1:GpBHCBWiqvVLDqmHZsoMM3C5ySeKTC7e
 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
 go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
+go.uber.org/automaxprocs v1.5.3 h1:kWazyxZUrS3Gs4qUpbwo5kEIMGe/DAvi5Z4tl2NW4j8=
+go.uber.org/automaxprocs v1.5.3/go.mod h1:eRbA25aqJrxAbsLO0xy5jVwPt7FQnRgjW+efnwa1WM0=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4=

router-tests/integration_test.go

@@ -17,6 +17,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"syscall"
 	"testing"
 	"time"
 
@@ -50,6 +51,73 @@ func TestSimpleQuery(t *testing.T) {
 	})
 }
 
+func TestConfigReload(t *testing.T) {
+	t.Parallel()
+
+	t.Run("Successfully reloads to a valid new configuration file with SIGHUP", func(t *testing.T) {
+		// Can be very slow, compiles the router binary if needed
+		err := testenv.RunRouterBinary(t, &testenv.Config{
+			DemoMode: true,
+		}, func(t *testing.T, xEnv *testenv.Environment) {
+			t.Logf("running router binary, cwd: %s", xEnv.GetRouterProcessCwd())
+
+			ctx := context.Background()
+
+			require.NoError(t, xEnv.WaitForServer(ctx, xEnv.RouterURL+"/health/ready", 600, 60), "healthcheck pre-reload failed")
+
+			f, err := os.Create(filepath.Join(xEnv.GetRouterProcessCwd(), "config.yaml"))
+			require.NoError(t, err)
+
+			_, err = f.WriteString(`
+version: "1"
+
+readiness_check_path: "/after"
+`)
+			require.NoError(t, err)
+
+			require.NoError(t, f.Close())
+
+			err = xEnv.SignalRouterProcess(syscall.SIGHUP)
+			require.NoError(t, err)
+
+			require.NoError(t, xEnv.WaitForServer(ctx, xEnv.RouterURL+"/after", 600, 60), "healthcheck post-reload failed")
+		})
+
+		require.NoError(t, err)
+	})
+
+	t.Run("Falls back to initial configuration if new configuration file is invalid", func(t *testing.T) {
+		// Can be very slow, compiles the router binary if needed
+		err := testenv.RunRouterBinary(t, &testenv.Config{
+			DemoMode: true,
+		}, func(t *testing.T, xEnv *testenv.Environment) {
+			t.Logf("running router binary, cwd: %s", xEnv.GetRouterProcessCwd())
+
+			ctx := context.Background()
+
+			require.NoError(t, xEnv.WaitForServer(ctx, xEnv.RouterURL+"/health/ready", 600, 60), "healthcheck pre-reload failed")
+
+			f, err := os.Create(filepath.Join(xEnv.GetRouterProcessCwd(), "config.yaml"))
+			require.NoError(t, err)
+
+			_, err = f.WriteString(`
+asdasdasdasdas: "NOT WORKING CONFIG!!!"
+`)
+			require.NoError(t, err)
+
+			require.NoError(t, f.Close())
+
+			err = xEnv.SignalRouterProcess(syscall.SIGHUP)
+			require.NoError(t, err)
+
+			require.NoError(t, xEnv.WaitForServer(ctx, xEnv.RouterURL+"/health/ready", 600, 60), "healthcheck post-reload failed")
+		})
+
+		require.NoError(t, err)
+	})
+
+}
+
 func TestNoSubgraphConfigWithoutDemoMode(t *testing.T) {
 	t.Parallel()
 

router-tests/lifecycle/supervisor_test.go

@@ -0,0 +1,46 @@
+package integration
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"github.com/wundergraph/cosmo/router-tests/testenv"
+	"go.uber.org/goleak"
+)
+
+func TestRouterSupervisor(t *testing.T) {
+	defer goleak.VerifyNone(t,
+		goleak.IgnoreTopFunction("github.com/hashicorp/consul/sdk/freeport.checkFreedPorts"), // Freeport, spawned by init
+		goleak.IgnoreAnyFunction("net/http.(*conn).serve"),                                   // HTTPTest server I can't close if I want to keep the problematic goroutine open for the test
+	)
+
+	xEnv, err := testenv.CreateTestSupervisorEnv(t, &testenv.Config{})
+	require.NoError(t, err)
+
+	// Start in untracked goroutine, should get cleaned up automatically
+	go xEnv.RouterSupervisor.Start()
+
+	// Ready 1
+	err = xEnv.WaitForServer(context.Background(), xEnv.RouterURL+"/health/ready", 250, 30)
+	require.NoError(t, err, "ready 1 timed out")
+
+	// Reload the router
+	xEnv.RouterSupervisor.Reload()
+
+	// Ready 2
+	err = xEnv.WaitForServer(context.Background(), xEnv.RouterURL+"/health/ready", 500, 30)
+	require.NoError(t, err, "ready 2 timed out")
+
+	// Shutdown the router and all the httptest servers
+	xEnv.RouterSupervisor.Stop()
+	xEnv.Shutdown()
+
+	// Let everything settle
+	time.Sleep(1 * time.Second)
+
+	// Should fail, since everything should be off now
+	err = xEnv.WaitForServer(context.Background(), xEnv.RouterURL+"/health/ready", 250, 1)
+	require.Error(t, err)
+}