[#71] Weighing: Fix reconnection behaviour when COM port is connected/disconnected

Tests/UnitTests/WeighingTests/ScaleTestHaugsdorfDMA02.cs

@@ -100,7 +100,7 @@ namespace Tests.UnitTests.WeighingTests {
             Mock.Weight = 1_000;
             Mock.Tare = 41;
             Mock.Error = "moving";
-            IOException ex = Assert.ThrowsAsync<IOException>(async () => await Scale!.Weigh());
+            var ex = Assert.ThrowsAsync<WeighingException>(async () => await Scale!.Weigh());
             Assert.That(ex.Message, Contains.Substring("Waage in Bewegung"));
         }
 
@@ -109,7 +109,7 @@ namespace Tests.UnitTests.WeighingTests {
             Mock.Weight = 1_000;
             Mock.Tare = 41;
             Mock.Error = "invalid";
-            Assert.ThrowsAsync<IOException>(async () => await Scale!.Weigh());
+            Assert.ThrowsAsync<FormatException>(async () => await Scale!.Weigh());
         }
     }
 }