Tests: more specificity to expiration and a bit more leadway

StackExchange.Redis.Tests/Expiry.cs

@@ -81,16 +81,15 @@ public void TestBasicExpiryDateTime(bool disablePTimes, bool utc)
                 Assert.Null(muxer.Wait(a));
                 var time = muxer.Wait(b);
                 Assert.NotNull(time);
-                Output.WriteLine("Time: {0}, Expected: {1}", time, resultOffset + TimeSpan.FromMinutes(59));
-                Assert.True(time > resultOffset + TimeSpan.FromMinutes(59) && time <= resultOffset + TimeSpan.FromMinutes(60));
+                Output.WriteLine("Time: {0}, Expected: {1}-{2}", time, resultOffset + TimeSpan.FromMinutes(58), resultOffset + TimeSpan.FromMinutes(60));
+                Assert.True(time >= resultOffset + TimeSpan.FromMinutes(58));
+                Assert.True(time <= resultOffset + TimeSpan.FromMinutes(60));
                 Assert.Null(muxer.Wait(c));
                 time = muxer.Wait(d);
                 Assert.NotNull(time);
-                Assert.True(time > resultOffset + TimeSpan.FromMinutes(89) && time <= resultOffset + TimeSpan.FromMinutes(90));
+                Assert.True(time >= resultOffset + TimeSpan.FromMinutes(88));
+                Assert.True(time <= resultOffset + TimeSpan.FromMinutes(90));
                 Assert.Null(muxer.Wait(e));
-
-                // Cleanup
-                conn.KeyDelete(key, CommandFlags.FireAndForget);
             }
         }
     }