diff --git a/.editorconfig b/.editorconfig
index cb8910a..deceb67 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -218,6 +218,9 @@ csharp_style_prefer_pattern_matching = true:silent
 csharp_style_prefer_not_pattern = true:suggestion
 csharp_style_prefer_extended_property_pattern = true:suggestion
 
+[*.cs]
+dotnet_diagnostic.SA1402.severity = none
+
 # Xml project files
 [*.{csproj,props,targets}]
 indent_size = 2
diff --git a/Streamistry.Core/ExceptionRouterPipe.cs b/Streamistry.Core/ExceptionRouterPipe.cs
index 44c28ee..011a33c 100644
--- a/Streamistry.Core/ExceptionRouterPipe.cs
+++ b/Streamistry.Core/ExceptionRouterPipe.cs
@@ -16,7 +16,7 @@ public ExceptionRouterPipe(IChainablePort<TInput>? upstream)
     [Trace]
     public override void Emit(TInput obj)
     {
-        if (TryCatchInvoke(obj, out var value, out var exception))
+        if (TryCatchInvoke(obj, out var value, out var _))
             PushDownstream(value);
         else
             Alternate.PushDownstream(obj);
diff --git a/Streamistry.Core/Fluent/ParserBuilder.cs b/Streamistry.Core/Fluent/ParserBuilder.cs
index 0b56634..2a90321 100644
--- a/Streamistry.Core/Fluent/ParserBuilder.cs
+++ b/Streamistry.Core/Fluent/ParserBuilder.cs
@@ -40,9 +40,9 @@ public ParserBuilder(IPipeBuilder<TInput> upstream)
         => Upstream = upstream;
 
     public SpecializedParserBuilder<TInput, DateOnly> AsDate()
-        => new SpecializedParserBuilder<TInput, DateOnly>(Upstream, typeof(DateParser), FormatProvider);
+        => new (Upstream, typeof(DateParser), FormatProvider);
     public SpecializedParserBuilder<TInput, DateTime> AsDateTime()
-        => new SpecializedParserBuilder<TInput, DateTime>(Upstream, typeof(DateTimeParser), FormatProvider);
+        => new (Upstream, typeof(DateTimeParser), FormatProvider);
 
     public ParserBuilder<TInput> WithFormatProvider(IFormatProvider formatProvider)
     {
diff --git a/Streamistry.Core/OutputPort.cs b/Streamistry.Core/OutputPort.cs
index 14d4854..78e0598 100644
--- a/Streamistry.Core/OutputPort.cs
+++ b/Streamistry.Core/OutputPort.cs
@@ -27,7 +27,7 @@ public void PushDownstream(T? obj)
         => Downstream?.Invoke(obj);
 
     public Action<T>[] GetDownstreamInvocations()
-        => Downstream?.GetInvocationList().Cast<Action<T>>().ToArray() ?? Array.Empty<Action<T>>();
+        => Downstream?.GetInvocationList().Cast<Action<T>>().ToArray() ?? [];
 }
 
 public class MainOutputPort<T> : OutputPort<T>
diff --git a/Streamistry.Core/Pipes/Mappers/Caster.cs b/Streamistry.Core/Pipes/Mappers/Caster.cs
index 8afb1a8..a9e4dfe 100644
--- a/Streamistry.Core/Pipes/Mappers/Caster.cs
+++ b/Streamistry.Core/Pipes/Mappers/Caster.cs
@@ -62,8 +62,6 @@ public static bool HasInheritanceConversion()
         }
         return null;
     }
-
-
 }
 
 public class Caster<TInput, TOutput> : Mapper<TInput, TOutput>
diff --git a/Streamistry.Testing/Fluent/PipelineBuilderTests.cs b/Streamistry.Testing/Fluent/PipelineBuilderTests.cs
index 8644ebb..5b7b61d 100644
--- a/Streamistry.Testing/Fluent/PipelineBuilderTests.cs
+++ b/Streamistry.Testing/Fluent/PipelineBuilderTests.cs
@@ -62,8 +62,11 @@ public void Build_FilterCheckpoint_Success()
             .Filter(x => x % 2 != 0).Checkpoint(out var filter)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(filter, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(filter, Is.Not.Null);
+        });
 
         var output = filter.GetOutputs(pipeline.Start);
         Assert.That(output, Has.Length.EqualTo(2));
@@ -78,8 +81,11 @@ public void Build_PluckerCheckpoint_Success()
             .Pluck(x => x.Month).Checkpoint(out var plucker)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(plucker, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(plucker, Is.Not.Null);
+        });
 
         var output = plucker.GetOutputs(pipeline.Start);
         Assert.Multiple(() =>
@@ -98,8 +104,11 @@ public void Build_ConstantCheckpoint_Success()
             .Constant(0).Checkpoint(out var constant)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(constant, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(constant, Is.Not.Null);
+        });
 
         var output = constant.GetOutputs(pipeline.Start);
         Assert.Multiple(() =>
@@ -118,8 +127,11 @@ public void Build_SplitterCheckpoint_Success()
             .Split(x => x?.Split('-') ?? []).Checkpoint(out var splitter)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(splitter, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(splitter, Is.Not.Null);
+        });
 
         var output = splitter.GetOutputs(pipeline.Start);
         Assert.Multiple(() =>
@@ -137,8 +149,11 @@ public void Build_AggregateMaxCheckpoint_Success()
             .Aggregate().AsMax().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(3));
@@ -152,8 +167,11 @@ public void Build_AggregateMinCheckpoint_Success()
             .Aggregate().AsMin().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(1));
@@ -167,8 +185,11 @@ public void Build_AggregateAverageCheckpoint_Success()
             .Aggregate().AsAverage().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(2));
@@ -182,8 +203,11 @@ public void Build_AggregateMedianCheckpoint_Success()
             .Aggregate().AsMedian().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(2));
@@ -197,8 +221,11 @@ public void Build_AggregateSumCheckpoint_Success()
             .Aggregate().AsSum().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(6));
@@ -212,8 +239,11 @@ public void Build_AggregateCountCheckpoint_Success()
             .Aggregate().AsCount().Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(3));
@@ -227,8 +257,11 @@ public void Build_AggregateUniversalCheckpoint_Success()
             .Aggregate((x, y) => x + y).Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo("fooBar"));
@@ -242,8 +275,11 @@ public void Build_AggregateUniversal2Checkpoint_Success()
             .Aggregate<int>((x, y) => x + (string.IsNullOrEmpty(y) ? 0 : y!.Length)).Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(6));
@@ -260,8 +296,11 @@ public void Build_AggregateUniversal3Checkpoint_Success()
                 .Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(false));
@@ -278,8 +317,11 @@ public void Build_AggregateUniversal4Checkpoint_Success()
                 .Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(true));
@@ -295,8 +337,11 @@ public void Build_ParserDateCheckpoint_Success()
                 .Checkpoint(out var parser)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(parser, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(parser, Is.Not.Null);
+        });
 
         var output = parser.GetOutputs(pipeline.Start);
         Assert.That(output, Does.Contain(new DateOnly(2024, 09, 14)));
@@ -313,8 +358,11 @@ public void Build_ParserDateTimeCheckpoint_Success()
                 .Checkpoint(out var parser)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(parser, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(parser, Is.Not.Null);
+        });
 
         var output = parser.GetOutputs(pipeline.Start);
         Assert.That(output, Has.Length.EqualTo(2));
@@ -341,8 +389,11 @@ public void Build_ParserRomanFiguresCheckpoint_Success()
             }).Checkpoint(out var parser)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(parser, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(parser, Is.Not.Null);
+        });
 
         var output = parser.GetOutputs(pipeline.Start);
         Assert.That(output, Has.Length.EqualTo(2));
@@ -364,8 +415,11 @@ public void Build_ComplexTryOnlyMainCheckpoint_Success()
                 .Checkpoint(out var aggr)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(aggr, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(aggr, Is.Not.Null);
+        });
 
         var output = aggr.GetOutputs(pipeline.Start);
         Assert.That(output.Last(), Is.EqualTo(16));
@@ -385,8 +439,11 @@ public void Build_CombineTwoUpstreamsCheckpoint_Success()
             .Zip((day, month) => $"{day} {month}").Checkpoint(out var zip)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(zip, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(zip, Is.Not.Null);
+        });
 
         var output = zip.GetOutputs(pipeline.Start);
         Assert.That(output, Does.Contain("15 September"));
@@ -407,8 +464,11 @@ public void Build_CombineThreeUpstreamsCheckpoint_Success()
             .Zip((day, month, year) => $"on {day} {month} {year}").Checkpoint(out var zip)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(zip, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(zip, Is.Not.Null);
+        });
 
         var output = zip.GetOutputs(pipeline.Start);
         Assert.That(output, Does.Contain("on 15 September 2025"));
@@ -428,8 +488,11 @@ public void Build_InBranchCheckpoint_Success()
             ).Checkpoints(out var ports)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(ports, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(ports, Is.Not.Null);
+        });
         Assert.That(ports, Has.Length.EqualTo(2));
 
         var outputMonth = ((IChainablePort<string>)ports[1]).GetOutputs(pipeline.Start);
@@ -449,8 +512,11 @@ public void Build_InBranchCheckpointForAllPorts_Success()
             ).Checkpoints(out var ports)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(ports, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(ports, Is.Not.Null);
+        });
         Assert.That(ports, Has.Length.EqualTo(2));
 
         var outputMonth = ((IChainablePort<string>)ports[1]).GetOutputs(pipeline.Start);
@@ -472,8 +538,11 @@ public void Build_InBranchCheckpointWithDiscardedPorts_Success()
             ).Checkpoints(out var _, out var monthPort, out var _)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(monthPort, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(monthPort, Is.Not.Null);
+        });
 
         var outputMonth = monthPort.GetOutputs(pipeline.Start);
         Assert.That(outputMonth, Does.Contain("September"));
@@ -492,15 +561,21 @@ public void Build_InBranchCheckpointForAllPortsAllAsserted_Success()
             ).Checkpoints(out var ports)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(ports, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(ports, Is.Not.Null);
+        });
         Assert.That(ports, Has.Length.EqualTo(2));
 
         var action = pipeline.Start;
         var (outputDay, outputMonth) = action.GetMultipleOutputs((IChainablePort<int>)ports[0], (IChainablePort<string>)ports[1]);
         Assert.That(outputDay, Does.Contain(15));
-        Assert.That(outputDay, Does.Contain(16));
-        Assert.That(outputMonth, Does.Contain("September"));
+        Assert.Multiple(() =>
+        {
+            Assert.That(outputDay, Does.Contain(16));
+            Assert.That(outputMonth, Does.Contain("September"));
+        });
     }
 
     [Test]
@@ -516,15 +591,21 @@ public void Build_InBranchCheckpointForAllPortsTypedAllAsserted_Success()
             ).Checkpoints(out var portDay, out var portMonth)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(portDay, Is.Not.Null);
-        Assert.That(portMonth, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(portDay, Is.Not.Null);
+            Assert.That(portMonth, Is.Not.Null);
+        });
 
         var action = pipeline.Start;
         var (outputDay, outputMonth) = action.GetMultipleOutputs(portDay, portMonth);
         Assert.That(outputDay, Does.Contain(15));
-        Assert.That(outputDay, Does.Contain(16));
-        Assert.That(outputMonth, Does.Contain("September"));
+        Assert.Multiple(() =>
+        {
+            Assert.That(outputDay, Does.Contain(16));
+            Assert.That(outputMonth, Does.Contain("September"));
+        });
     }
 
     [Test]
@@ -543,15 +624,21 @@ public void Build_InBranchOfBranchCheckpointForAllPortsTypedAllAsserted_Success(
             ).Checkpoints(out var portDay, out var portMonth)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(portDay, Is.Not.Null);
-        Assert.That(portMonth, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(portDay, Is.Not.Null);
+            Assert.That(portMonth, Is.Not.Null);
+        });
 
         var action = pipeline.Start;
         var (outputDay, outputMonth) = action.GetMultipleOutputs(portDay, portMonth);
         Assert.That(outputDay, Does.Contain(33));
-        Assert.That(outputDay, Does.Contain(35));
-        Assert.That(outputMonth, Does.Contain("September"));
+        Assert.Multiple(() =>
+        {
+            Assert.That(outputDay, Does.Contain(35));
+            Assert.That(outputMonth, Does.Contain("September"));
+        });
     }
 
     [Test]
@@ -568,8 +655,11 @@ public void Build_CombineFiveUpstreamsCheckpoint_Success()
             .Zip((stream1, stream2, stream3, stream4, stream5) => stream1 + stream2 + stream3 + stream4 + stream5).Checkpoint(out var zip)
             .Build();
 
-        Assert.That(pipeline, Is.Not.Null);
-        Assert.That(zip, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(pipeline, Is.Not.Null);
+            Assert.That(zip, Is.Not.Null);
+        });
 
         var output = zip.GetOutputs(pipeline.Start);
         Assert.That(output, Does.Contain(20));
diff --git a/Streamistry.Testing/UnionTests.cs b/Streamistry.Testing/UnionTests.cs
index 01a7975..5841ff1 100644
--- a/Streamistry.Testing/UnionTests.cs
+++ b/Streamistry.Testing/UnionTests.cs
@@ -13,12 +13,12 @@ public class UnionTests
     [Test]
     public void Union_ManyPipes_AsSinglePipe()
     {
-        
         var firstSource = new EnumerableSource<int>([1, 2, 3]);
         var secondSource = new EnumerableSource<int>([10, 20, 30]);
         var pipeline = new Pipeline([firstSource, secondSource]);
         var union = new Union<int>([firstSource, secondSource]);
 
-        Assert.That(union.GetOutputs(pipeline.Start), Is.EqualTo(new int[] { 1, 2, 3, 10, 20, 30 }));
+        var expected = new int[] { 1, 2, 3, 10, 20, 30 };
+        Assert.That(union.GetOutputs(pipeline.Start), Is.EqualTo(expected));
     }
 }