syncapi: add more tests; fix more bugs (#2338)

* syncapi: add more tests; fix more bugs

bugfixes:
 - The postgres impl of TopologyTable.SelectEventIDsInRange did not use the provided txn
 - The postgres impl of EventsTable.SelectEvents did not preserve the ordering of the input event IDs in the output events slice
 - The sqlite impl of EventsTable.SelectEvents did not use a bulk `IN ($1)` query.

Added tests:
 - `TestGetEventsInRangeWithTopologyToken`
 - `TestOutputRoomEventsTable`
 - `TestTopologyTable`

* -p 1 for now

test/db.go

@@ -121,6 +121,7 @@ func WithAllDatabases(t *testing.T, testFn func(t *testing.T, db DBType)) {
 	for dbName, dbType := range dbs {
 		dbt := dbType
 		t.Run(dbName, func(tt *testing.T) {
+			tt.Parallel()
 			testFn(tt, dbt)
 		})
 	}

test/event.go

@@ -15,7 +15,9 @@
 package test
 
 import (
+	"bytes"
 	"crypto/ed25519"
+	"testing"
 	"time"
 
 	"github.com/matrix-org/gomatrixserverlib"
@@ -49,3 +51,40 @@ func WithUnsigned(unsigned interface{}) eventModifier {
 		e.unsigned = unsigned
 	}
 }
+
+// Reverse a list of events
+func Reversed(in []*gomatrixserverlib.HeaderedEvent) []*gomatrixserverlib.HeaderedEvent {
+	out := make([]*gomatrixserverlib.HeaderedEvent, len(in))
+	for i := 0; i < len(in); i++ {
+		out[i] = in[len(in)-i-1]
+	}
+	return out
+}
+
+func AssertEventIDsEqual(t *testing.T, gotEventIDs []string, wants []*gomatrixserverlib.HeaderedEvent) {
+	t.Helper()
+	if len(gotEventIDs) != len(wants) {
+		t.Fatalf("length mismatch: got %d events, want %d", len(gotEventIDs), len(wants))
+	}
+	for i := range wants {
+		w := wants[i].EventID()
+		g := gotEventIDs[i]
+		if w != g {
+			t.Errorf("event at index %d mismatch:\ngot  %s\n\nwant %s", i, string(g), string(w))
+		}
+	}
+}
+
+func AssertEventsEqual(t *testing.T, gots, wants []*gomatrixserverlib.HeaderedEvent) {
+	t.Helper()
+	if len(gots) != len(wants) {
+		t.Fatalf("length mismatch: got %d events, want %d", len(gots), len(wants))
+	}
+	for i := range wants {
+		w := wants[i].JSON()
+		g := gots[i].JSON()
+		if !bytes.Equal(w, g) {
+			t.Errorf("event at index %d mismatch:\ngot  %s\n\nwant %s", i, string(g), string(w))
+		}
+	}
+}