Fixed tests to use exe name, rather than hardcoding testhost

The exe name appears to differ in CI

Author: KathleenDollard

src/System.CommandLine.Tests/ParserTests.cs

@@ -1748,7 +1748,7 @@ public void Location_in_ValueResult_correct_for_arguments()
             {
                 command
             };
-            var expectedOuterLocation = new Location("testhost", Location.User, -1, null);
+            var expectedOuterLocation = new Location(CliExecutable.ExecutableName, Location.User, -1, null);
             var expectedLocation1 = new Location("Kirk", Location.User, 1, expectedOuterLocation);
             var expectedLocation2 = new Location("Spock", Location.User, 2, expectedOuterLocation);
 
@@ -1775,7 +1775,7 @@ public void Location_in_ValueResult_correct_for_options()
             {
                 command
             };
-            var expectedOuterLocation = new Location("testhost", Location.User, -1, null);
+            var expectedOuterLocation = new Location(CliExecutable.ExecutableName, Location.User, -1, null);
             var expectedLocation1 = new Location("Kirk", Location.User, 3, expectedOuterLocation);
             var expectedLocation2 = new Location("Spock", Location.User, 5, expectedOuterLocation);
 
@@ -1802,7 +1802,7 @@ public void Location_offsets_in_ValueResult_correct_for_arguments()
             {
                 command
             };
-            var expectedOuterLocation = new Location("testhost", Location.User, -1, null);
+            var expectedOuterLocation = new Location(CliExecutable.ExecutableName, Location.User, -1, null);
             var expectedLocation1 = new Location("Kirk", Location.User, 1, expectedOuterLocation);
             var expectedLocation2 = new Location("Spock", Location.User, 2, expectedOuterLocation);
 
@@ -1826,7 +1826,7 @@ public void Location_offsets_in_ValueResult_correct_for_options()
             {
                 command
             };
-            var expectedOuterLocation = new Location("testhost", Location.User, -1, null);
+            var expectedOuterLocation = new Location(CliExecutable.ExecutableName, Location.User, -1, null);
             var expectedLocation1 = new Location("Kirk", Location.User, 3, expectedOuterLocation);
             var expectedLocation2 = new Location("Spock", Location.User, 5, expectedOuterLocation);
 
@@ -1852,7 +1852,7 @@ public void Location_offset_correct_when_colon_or_equal_used()
             {
                 command
             };
-            var expectedOuterLocation = new Location("testhost", Location.User, -1, null);
+            var expectedOuterLocation = new Location(CliExecutable.ExecutableName, Location.User, -1, null);
             var expectedLocation1 = new Location("Kirk", Location.User, 2, expectedOuterLocation, 7);
             var expectedLocation2 = new Location("Spock", Location.User, 3, expectedOuterLocation, 8);
 

src/System.CommandLine.Tests/TokenizerTests.cs

@@ -56,8 +56,8 @@ public void Location_stack_ToString_is_correct()
             errors.Should().BeNull();
             tokens.Count.Should().Be(3); 
             locations.Count.Should().Be(2);
-            locations[0].Should().Be("testhost from User[-1, 8, 0]; --hello from User[0, 7, 0]");
-            locations[1].Should().Be("testhost from User[-1, 8, 0]; world from User[1, 5, 0]");
+            locations[0].Should().Be($"{CliExecutable.ExecutableName} from User[-1, {CliExecutable.ExecutableName.Length}, 0]; --hello from User[0, 7, 0]");
+            locations[1].Should().Be($"{CliExecutable.ExecutableName} from User[-1, {CliExecutable.ExecutableName.Length}, 0]; world from User[1, 5, 0]");
         }
 
         [Fact]