feat: TestSkipHeights skip 5 seconds per every height

examples/gno.land/r/x/skip_height_to_skip_time/skiptime.gno

@@ -0,0 +1 @@
+package skiptime

examples/gno.land/r/x/skip_height_to_skip_time/skiptime_test.gno

@@ -0,0 +1,27 @@
+package skiptime
+
+import (
+	"std"
+	"testing"
+	"time"
+)
+
+func TestSkipHeights(t *testing.T) {
+	oldHeight := std.GetHeight()
+	shouldEQ(t, oldHeight, 123)
+
+	oldNow := time.Now().Unix()
+	shouldEQ(t, oldNow, 1234567890)
+
+	// skip 3 blocks == 15 seconds
+	std.TestSkipHeights(3)
+
+	shouldEQ(t, std.GetHeight()-oldHeight, 3)
+	shouldEQ(t, time.Now().Unix()-oldNow, 15)
+}
+
+func shouldEQ(t *testing.T, got, expected int64) {
+	if got != expected {
+		t.Fatalf("expected %d, got %d.", expected, got)
+	}
+}

gnovm/tests/stdlibs/std/std.go

@@ -48,6 +48,7 @@ func TestCurrentRealm(m *gno.Machine) string {
 func TestSkipHeights(m *gno.Machine, count int64) {
 	ctx := m.Context.(std.ExecContext)
 	ctx.Height += count
+	ctx.Timestamp += (count * 5)
 	m.Context = ctx
 }