testy: don't give Clock.Step==0 magical behavior.
Turns out it's sometimes useful to stop time entirely.
// called, beginning at Start.
//
// The zero value starts virtual time at an arbitrary value recorded
-// in Start on the first call to Now, and increments by one second
-// between calls to Now.
+// in Start on the first call to Now, and time never advances.
type Clock struct {
// Start is the first value returned by Now.
Start time.Time
// Step is how much to advance with each Now call.
- // Zero means 1 second.
Step time.Duration
// Present is the time that the next Now call will receive.
Present time.Time
@@ -30,9 +28,6 @@ func (c *Clock) Now() time.Time {
c.Present = c.Start
}
step := c.Step
- if step == 0 {
- step = time.Second
- }
ret := c.Present
c.Present = c.Present.Add(step)
return ret
