api: adding a gRPC call for listing passwords.

storage/conformance/conformance.go

@@ -5,6 +5,7 @@ package conformance
 
 import (
 	"reflect"
+	"sort"
 	"testing"
 	"time"
 
@@ -244,6 +245,12 @@ func testRefreshTokenCRUD(t *testing.T, s storage.Storage) {
 	}
 }
 
+type byEmail []storage.Password
+
+func (n byEmail) Len() int           { return len(n) }
+func (n byEmail) Less(i, j int) bool { return n[i].Email < n[j].Email }
+func (n byEmail) Swap(i, j int)      { n[i], n[j] = n[j], n[i] }
+
 func testPasswordCRUD(t *testing.T, s storage.Storage) {
 	// Use bcrypt.MinCost to keep the tests short.
 	passwordHash, err := bcrypt.GenerateFromPassword([]byte("secret"), bcrypt.MinCost)
@@ -294,6 +301,8 @@ func testPasswordCRUD(t *testing.T, s storage.Storage) {
 			t.Errorf("list password: %v", err)
 			return
 		}
+		sort.Sort(byEmail(want))
+		sort.Sort(byEmail(passwords))
 		if diff := pretty.Compare(want, passwords); diff != "" {
 			t.Errorf("password list retrieved from storage did not match: %s", diff)
 		}