Keep the unit level within its bound: the counter test counts 400 not 2000, the deadline test waits 50 ms not 1 s (issue 895)

Both still prove what they did: the counter test still collides every run and fails when an increment
writes without its revision; the deadline test fails when the read after a failed write takes a later
deadline than the ask's.

go/cli/refusal_test.go

@@ -106,7 +106,7 @@ func TestAFailedWriteWaitsNoLongerThanTheDeadline(t *testing.T) {
 		default:
 		}
 	})
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
 	defer cancel()
 	start := time.Now()
 	_, err = Ask(ctx, socket, aLineTheSocketCannotHold())
@@ -117,7 +117,7 @@ func TestAFailedWriteWaitsNoLongerThanTheDeadline(t *testing.T) {
 	if !errors.Is(err, os.ErrDeadlineExceeded) {
 		t.Fatalf("the error is not the deadline: %v", err)
 	}
-	if waited > 3*time.Second {
-		t.Fatalf("waited %s with a deadline of 1s", waited)
+	if waited > time.Second {
+		t.Fatalf("waited %s with a deadline of 50ms", waited)
 	}
 }