Fix device list test

tests/csapi/device_lists_test.go

@@ -1,9 +1,12 @@
 package csapi_tests
 
 import (
+	"encoding/base64"
 	"fmt"
 	"testing"
 
+	"math/rand"
+
 	"github.com/matrix-org/complement"
 	"github.com/matrix-org/complement/client"
 	"github.com/matrix-org/complement/helpers"
@@ -18,15 +21,22 @@ import (
 //  1. `/sync`'s `device_lists.changed/left` contain the correct user IDs.
 //  2. `/keys/query` returns the correct information after device list updates.
 func TestDeviceListUpdates(t *testing.T) {
+	prng := rand.New(rand.NewSource(42))
 	// uploadNewKeys uploads a new set of keys for a given client.
 	// Returns a check function that can be passed to mustQueryKeys.
 	uploadNewKeys := func(t *testing.T, user *client.CSAPI) []match.JSON {
 		t.Helper()
 		ed25519KeyID := fmt.Sprintf("ed25519:%s", user.DeviceID)
 		curve25519KeyID := fmt.Sprintf("curve25519:%s", user.DeviceID)
-		// valid keys generated by a client
-		ed25519Key := "aPtHi1NV5O66InHYyrAtjEBTP+Ua33St/3aS4PVR+IE"
-		curve25519Key := "BLTpDRieneXv24C4IVCAq6pte9u2qo1zT5Ee3jB0pzk"
+		// generate key-like looking values
+		ed25519KeyBytes := make([]byte, 32)
+		_, err := prng.Read(ed25519KeyBytes)
+		must.NotError(t, "failed to read from prng", err)
+		ed25519Key := base64.RawStdEncoding.EncodeToString(ed25519KeyBytes)
+		curve25519KeyBytes := make([]byte, 32)
+		_, err = prng.Read(curve25519KeyBytes)
+		must.NotError(t, "failed to read from prng", err)
+		curve25519Key := base64.RawStdEncoding.EncodeToString(curve25519KeyBytes)
 
 		user.MustDo(t, "POST", []string{"_matrix", "client", "v3", "keys", "upload"},
 			client.WithJSONBody(t, map[string]interface{}{