Collector milestone 5: end-to-end integration tests
cmd/agent-watcher/main_test.go builds the real binary in TestMain, then
launches it twice with temp configs to exercise the full path:
TestEndToEnd_BothSourcesEmitToInbox
- drops a *.json file via tmp+rename (mirrors Syncthing semantics)
- POSTs a webhook with template variables ({{ .repo }}, {{ .actor }})
- POSTs a urgent alert with empty body and fixed-string template
- asserts 3 JSONL lines land in bob.inbox with exact shape
- confirms each event's source field tracks origin
("drop-folder:drop1.json", "webhook:/forgejo/push")
- hits /health and verifies emitted=2 (one webhook didn't 200, that
counter only counts successful emits)
TestEndToEnd_GracefulShutdown
- SIGTERM after listener up
- asserts process exits within 3s
Total: 43 tests across 5 packages, all passing. Real binary verified
end-to-end on Linux/amd64.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
bob-boat
parent
2183850c03
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1 changed files with 299 additions and 0 deletions
299
cmd/agent-watcher/main_test.go
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299
cmd/agent-watcher/main_test.go
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package main
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"syscall"
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"testing"
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"time"
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)
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// TestMain builds the agent-watcher binary once for the integration tests.
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func TestMain(m *testing.M) {
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bin, err := buildBinary()
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if err != nil {
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fmt.Fprintln(os.Stderr, "build failed:", err)
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os.Exit(1)
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}
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binaryPath = bin
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code := m.Run()
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os.Remove(bin)
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os.Exit(code)
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}
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var binaryPath string
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func buildBinary() (string, error) {
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dir, err := os.MkdirTemp("", "agent-watcher-bin-*")
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if err != nil {
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return "", err
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}
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out := filepath.Join(dir, "agent-watcher")
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cmd := exec.Command("go", "build", "-o", out, ".")
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cmd.Stderr = os.Stderr
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if err := cmd.Run(); err != nil {
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return "", err
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}
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return out, nil
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}
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// freePort returns an unused loopback "127.0.0.1:N" port.
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func freePort(t *testing.T) string {
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t.Helper()
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l, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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addr := l.Addr().String()
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l.Close()
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return addr
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}
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// startBinary launches agent-watcher with the given config file and returns
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// the running cmd. The test is responsible for sending SIGINT/SIGTERM.
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func startBinary(t *testing.T, configPath string) *exec.Cmd {
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t.Helper()
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cmd := exec.Command(binaryPath, "--config", configPath)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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if err := cmd.Start(); err != nil {
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t.Fatal(err)
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}
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t.Cleanup(func() {
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if cmd.Process != nil {
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cmd.Process.Signal(syscall.SIGTERM)
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cmd.Wait()
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}
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})
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return cmd
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}
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// waitFor polls predicate until true or timeout.
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func waitFor(t *testing.T, name string, pred func() bool, timeout time.Duration) {
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t.Helper()
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deadline := time.Now().Add(timeout)
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for time.Now().Before(deadline) {
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if pred() {
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return
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}
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time.Sleep(20 * time.Millisecond)
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}
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t.Fatalf("waitFor %q: predicate did not become true within %s", name, timeout)
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}
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func waitForListener(t *testing.T, addr string, timeout time.Duration) {
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t.Helper()
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deadline := time.Now().Add(timeout)
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for time.Now().Before(deadline) {
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c, err := net.DialTimeout("tcp", addr, 50*time.Millisecond)
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if err == nil {
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c.Close()
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return
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}
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time.Sleep(20 * time.Millisecond)
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}
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t.Fatalf("listener at %s never came up", addr)
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}
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func readInbox(t *testing.T, path string) []map[string]any {
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t.Helper()
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body, err := os.ReadFile(path)
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if err != nil {
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return nil
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}
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out := []map[string]any{}
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for _, line := range strings.Split(strings.TrimRight(string(body), "\n"), "\n") {
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if line == "" {
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continue
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}
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var m map[string]any
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if err := json.Unmarshal([]byte(line), &m); err != nil {
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t.Errorf("non-JSON line: %s", line)
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continue
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}
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out = append(out, m)
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}
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return out
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}
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// TestEndToEnd_BothSourcesEmitToInbox builds and runs the real binary,
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// exercises both webhook and drop-folder sources, and verifies the inbox
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// file contains one bit-identical JSONL line per emitted event.
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func TestEndToEnd_BothSourcesEmitToInbox(t *testing.T) {
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tmp := t.TempDir()
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inboxDir := filepath.Join(tmp, "pings")
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dropDir := filepath.Join(tmp, "incoming")
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configPath := filepath.Join(tmp, "collector.yaml")
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addr := freePort(t)
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cfg := fmt.Sprintf(`
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agent: foreman
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inbox_dir: %s
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sources:
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webhook:
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listen: %s
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routes:
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/forgejo/push:
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recipient: bob
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type: INFO
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payload_template: "push {{ .repo }} by {{ .actor }}"
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/alert:
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recipient: bob
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type: NEEDS-RESPONSE
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priority: urgent
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payload_template: "fixed alert"
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drop_folder:
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path: %s
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poll_fallback_seconds: 0
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`, inboxDir, addr, dropDir)
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if err := os.WriteFile(configPath, []byte(cfg), 0644); err != nil {
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t.Fatal(err)
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}
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startBinary(t, configPath)
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waitForListener(t, addr, 3*time.Second)
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// 1) drop a file
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dropContent := `{"recipient":"bob","type":"INFO","payload":"from drop"}`
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dropTmp := filepath.Join(dropDir, "drop1.json.tmp")
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if err := os.WriteFile(dropTmp, []byte(dropContent), 0644); err != nil {
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t.Fatal(err)
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}
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if err := os.Rename(dropTmp, filepath.Join(dropDir, "drop1.json")); err != nil {
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t.Fatal(err)
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}
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// 2) post a webhook
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resp, err := http.Post("http://"+addr+"/forgejo/push", "application/json",
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strings.NewReader(`{"repo":"agent-ping","actor":"angus"}`))
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if err != nil {
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t.Fatal(err)
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}
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resp.Body.Close()
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if resp.StatusCode != http.StatusAccepted {
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t.Fatalf("webhook status = %d", resp.StatusCode)
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}
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// 3) post a urgent alert
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resp2, err := http.Post("http://"+addr+"/alert", "application/json", strings.NewReader(""))
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if err != nil {
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t.Fatal(err)
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}
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resp2.Body.Close()
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// Wait for 3 lines in bob's inbox.
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bobInbox := filepath.Join(inboxDir, "bob.inbox")
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waitFor(t, "3 inbox lines", func() bool {
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return len(readInbox(t, bobInbox)) == 3
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}, 3*time.Second)
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got := readInbox(t, bobInbox)
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payloads := map[string]map[string]any{}
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for _, m := range got {
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payloads[m["payload"].(string)] = m
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}
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// drop event
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drop := payloads["from drop"]
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if drop == nil {
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t.Fatalf("missing drop event; got: %+v", got)
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}
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if drop["type"] != "INFO" || drop["from"] != "collector" {
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t.Errorf("drop event shape: %+v", drop)
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}
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if !strings.HasPrefix(drop["source"].(string), "drop-folder:drop1.json") {
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t.Errorf("drop source: %v", drop["source"])
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}
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// webhook push event
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push := payloads["push agent-ping by angus"]
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if push == nil {
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t.Fatalf("missing push event; got: %+v", got)
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}
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if push["type"] != "INFO" || push["priority"] != "normal" {
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t.Errorf("push event shape: %+v", push)
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}
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if push["source"] != "webhook:/forgejo/push" {
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t.Errorf("push source: %v", push["source"])
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}
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// alert event with priority urgent
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alert := payloads["fixed alert"]
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if alert == nil {
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t.Fatalf("missing alert event; got: %+v", got)
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}
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if alert["priority"] != "urgent" || alert["type"] != "NEEDS-RESPONSE" {
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t.Errorf("alert event shape: %+v", alert)
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}
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// Health endpoint is wired and returns sane counters.
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resp3, err := http.Get("http://" + addr + "/health")
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if err != nil {
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t.Fatal(err)
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}
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defer resp3.Body.Close()
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var stats map[string]any
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if err := json.NewDecoder(resp3.Body).Decode(&stats); err != nil {
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t.Fatal(err)
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}
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if int(stats["emitted"].(float64)) != 2 {
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t.Errorf("health emitted = %v, want 2", stats["emitted"])
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}
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}
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// TestEndToEnd_GracefulShutdown ensures SIGTERM stops the binary cleanly.
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func TestEndToEnd_GracefulShutdown(t *testing.T) {
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tmp := t.TempDir()
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configPath := filepath.Join(tmp, "collector.yaml")
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addr := freePort(t)
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cfg := fmt.Sprintf(`
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agent: foreman
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inbox_dir: %s/pings
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sources:
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webhook:
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listen: %s
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routes:
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/x:
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recipient: r
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type: INFO
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payload_template: ok
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`, tmp, addr)
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if err := os.WriteFile(configPath, []byte(cfg), 0644); err != nil {
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t.Fatal(err)
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}
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cmd := exec.Command(binaryPath, "--config", configPath)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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if err := cmd.Start(); err != nil {
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t.Fatal(err)
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}
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waitForListener(t, addr, 3*time.Second)
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if err := cmd.Process.Signal(syscall.SIGTERM); err != nil {
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t.Fatal(err)
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}
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done := make(chan error, 1)
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go func() { done <- cmd.Wait() }()
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select {
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case err := <-done:
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if err != nil {
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// Some Go runtimes return an exitstatus error after signal-driven
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// shutdown; that's OK as long as we exited.
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if _, ok := err.(*exec.ExitError); !ok {
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t.Errorf("unexpected exit error: %v", err)
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}
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}
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case <-time.After(3 * time.Second):
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cmd.Process.Kill()
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t.Fatal("did not shut down within 3s of SIGTERM")
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}
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}
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