Run test dummy through the app host

CliFx.Tests/CancellationSpecs.cs

@@ -41,11 +41,9 @@ public class CancellationSpecs : SpecsBase
             PipeTarget.ToStringBuilder(stdOutBuffer)
         );
 
-        var command = Cli.Wrap("dotnet")
-            .WithArguments(a => a
-                .Add(Dummy.Program.Location)
-                .Add("cancel-test")
-            ) | pipeTarget;
+        var command =
+            Cli.Wrap(Dummy.Program.FilePath).WithArguments("cancel-test") |
+            pipeTarget;
 
         // Act & assert
         await Assert.ThrowsAnyAsync<OperationCanceledException>(async () =>

CliFx.Tests/ConsoleSpecs.cs

@@ -27,11 +27,9 @@ public class ConsoleSpecs : SpecsBase
         // Can't verify our own console output, so using an external process for this test
 
         // Arrange
-        var command = "Hello world" | Cli.Wrap("dotnet")
-            .WithArguments(a => a
-                .Add(Dummy.Program.Location)
-                .Add("console-test")
-            );
+        var command =
+            "Hello world" |
+            Cli.Wrap(Dummy.Program.FilePath).WithArguments("console-test");
 
         // Act
         var result = await command.ExecuteBufferedAsync();

CliFx.Tests/DirectivesSpecs.cs

@@ -32,11 +32,9 @@ public class DirectivesSpecs : SpecsBase
                 cts.Cancel();
         }
 
-        var command = Cli.Wrap("dotnet")
-            .WithArguments(a => a
-                .Add(Dummy.Program.Location)
-                .Add("[debug]")
-            ) | HandleStdOut;
+        var command =
+            Cli.Wrap(Dummy.Program.FilePath).WithArguments("[debug]") |
+            HandleStdOut;
 
         // Act & assert
         try

CliFx.Tests/EnvironmentSpecs.cs

@@ -169,11 +169,8 @@ public class EnvironmentSpecs : SpecsBase
         // System.Environment when they are not provided explicitly to CliApplication.
 
         // Arrange
-        var command = Cli.Wrap("dotnet")
-            .WithArguments(a => a
-                .Add(Dummy.Program.Location)
-                .Add("env-test")
-            )
+        var command = Cli.Wrap(Dummy.Program.FilePath)
+            .WithArguments("env-test")
             .WithEnvironmentVariables(e => e
                 .Set("ENV_TARGET", "Mars")
             );