Resolve TestAkamaiPurgerDrainQueueFails race (#6844)

Fixes https://github.com/letsencrypt/boulder/issues/6837

test/integration/akamai_purger_drain_queue_test.go

@@ -77,13 +77,19 @@ func TestAkamaiPurgerDrainQueueFails(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	_, err = purgerClient.Purge(context.Background(), &akamaipb.PurgeRequest{
-		Urls: []string{"http://example.com/"},
-	})
-	if err != nil {
-		// Don't use t.Fatal here because we need to get as far as the SIGTERM or
-		// we'll hang on exit.
-		t.Error(err)
+
+	// We know that the purger is configured to only process two items per batch,
+	// so submitting 10 items should give it enough of a backlog to guarantee
+	// that our SIGTERM reaches the process before it's fully cleared the queue.
+	for i := 0; i < 10; i++ {
+		_, err = purgerClient.Purge(context.Background(), &akamaipb.PurgeRequest{
+			Urls: []string{fmt.Sprintf("http://example%d.com/", i)},
+		})
+		if err != nil {
+			// Don't use t.Fatal here because we need to get as far as the SIGTERM or
+			// we'll hang on exit.
+			t.Error(err)
+		}
 	}
 
 	purgerCmd.Process.Signal(syscall.SIGTERM)
@@ -91,7 +97,11 @@ func TestAkamaiPurgerDrainQueueFails(t *testing.T) {
 	if err == nil {
 		t.Error("expected error shutting down akamai-purger that could not reach backend")
 	}
-	test.AssertContains(t, outputBuffer.String(), "failed to purge OCSP responses for 1 certificates before exit: all attempts to submit purge request failed")
+
+	// Use two asserts because we're not sure what integer (10? 8?) will come in
+	// the middle of the error message.
+	test.AssertContains(t, outputBuffer.String(), "failed to purge OCSP responses for")
+	test.AssertContains(t, outputBuffer.String(), "certificates before exit: all attempts to submit purge request failed")
 }
 
 func TestAkamaiPurgerDrainQueueSucceeds(t *testing.T) {

test/integration/testdata/akamai-purger-queue-drain-config.json

@@ -1,29 +1,41 @@
 {
-    "akamaiPurger": {
-        "debugAddr": ":9766",
-        "purgeRetries": 10,
-        "purgeRetryBackoff": "50ms",
-        "baseURL": "http://localhost:6889",
-        "clientToken": "its-a-token",
-        "clientSecret": "its-a-secret",
-        "accessToken": "idk-how-this-is-different-from-client-token-but-okay",
-        "v3Network": "staging",
-        "tls": {
-          "caCertfile": "test/grpc-creds/minica.pem",
-          "certFile": "test/grpc-creds/akamai-purger.boulder/cert.pem",
-          "keyFile": "test/grpc-creds/akamai-purger.boulder/key.pem"
-        },
-        "grpc": {
-          "address": ":9199",
-          "clientNames": [
-            "health-checker.boulder",
-            "ra.boulder"
-          ]
-        }
-    },
-
-    "syslog": {
-      "stdoutlevel": 6,
-      "sysloglevel": 6
-    }
+	"akamaiPurger": {
+		"debugAddr": ":9766",
+		"purgeRetries": 10,
+		"purgeRetryBackoff": "50ms",
+		"throughput": {
+			"queueEntriesPerBatch": 2,
+			"purgeBatchInterval": "32ms"
+		},
+		"baseURL": "http://localhost:6889",
+		"clientToken": "its-a-token",
+		"clientSecret": "its-a-secret",
+		"accessToken": "idk-how-this-is-different-from-client-token-but-okay",
+		"v3Network": "staging",
+		"tls": {
+			"caCertfile": "test/grpc-creds/minica.pem",
+			"certFile": "test/grpc-creds/akamai-purger.boulder/cert.pem",
+			"keyFile": "test/grpc-creds/akamai-purger.boulder/key.pem"
+		},
+		"grpc": {
+			"address": ":9199",
+			"maxConnectionAge": "30s",
+			"services": {
+				"akamai.AkamaiPurger": {
+					"clientNames": [
+						"ra.boulder"
+					]
+				},
+				"grpc.health.v1.Health": {
+					"clientNames": [
+						"health-checker.boulder"
+					]
+				}
+			}
+		}
+	},
+	"syslog": {
+		"stdoutlevel": 6,
+		"sysloglevel": -1
+	}
 }