diff --git a/test/Microsoft.NET.TestFramework/Assertions/CommandResultAssertions.cs b/test/Microsoft.NET.TestFramework/Assertions/CommandResultAssertions.cs
index a7220a60eb89..211e6a881728 100644
--- a/test/Microsoft.NET.TestFramework/Assertions/CommandResultAssertions.cs
+++ b/test/Microsoft.NET.TestFramework/Assertions/CommandResultAssertions.cs
@@ -143,9 +143,9 @@ public AndConstraint<CommandResultAssertions> HaveStdErrContainingOnce(string pa
         {
             var lines = _commandResult.StdErr?.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
             var matchingLines = lines?.Where(line => line.Contains(pattern)).Count();
-            Execute.Assertion.ForCondition(matchingLines == 0)
+            Execute.Assertion.ForCondition(matchingLines != 0)
                 .FailWith(AppendDiagnosticsTo($"The command error output did not contain expected result: {pattern}{Environment.NewLine}"));
-            Execute.Assertion.ForCondition(matchingLines != 1)
+            Execute.Assertion.ForCondition(matchingLines == 1)
                 .FailWith(AppendDiagnosticsTo($"The command error output was expected to contain the pattern '{pattern}' once, but found it {matchingLines} times.{Environment.NewLine}"));
             return new AndConstraint<CommandResultAssertions>(this);
         }
diff --git a/test/dotnet-run.Tests/GivenDotnetRunThrowsAParseError.cs b/test/dotnet-run.Tests/GivenDotnetRunThrowsAParseError.cs
index f03f4c618427..cb31366e3de9 100644
--- a/test/dotnet-run.Tests/GivenDotnetRunThrowsAParseError.cs
+++ b/test/dotnet-run.Tests/GivenDotnetRunThrowsAParseError.cs
@@ -19,7 +19,7 @@ public void ItFailsWithAnAppropriateErrorMessage()
                 .WithWorkingDirectory(Path.GetTempPath())
                 .Execute("--", "1")
                 .Should().Fail()
-                .And.HaveStdErrContainingOnce(LocalizableStrings.RunCommandExceptionNoProjects);
+                .And.HaveStdErrContainingOnce("Couldn't find a project to run.");
         }
     }
 }