Update expected error message due to changes in file provider

build/dependencies.props

@@ -4,11 +4,11 @@
   </PropertyGroup>
   <PropertyGroup Label="Package Versions">
     <InternalAspNetCoreSdkPackageVersion>3.0.0-alpha1-20180821.3</InternalAspNetCoreSdkPackageVersion>
-    <MicrosoftAspNetCoreTestingPackageVersion>3.0.0-alpha1-10352</MicrosoftAspNetCoreTestingPackageVersion>
+    <MicrosoftAspNetCoreTestingPackageVersion>3.0.0-alpha1-10382</MicrosoftAspNetCoreTestingPackageVersion>
     <MicrosoftAzureKeyVaultPackageVersion>2.3.2</MicrosoftAzureKeyVaultPackageVersion>
     <MicrosoftAzureServicesAppAuthenticationPackageVersion>1.0.1</MicrosoftAzureServicesAppAuthenticationPackageVersion>
-    <MicrosoftExtensionsFileProvidersPhysicalPackageVersion>3.0.0-alpha1-10352</MicrosoftExtensionsFileProvidersPhysicalPackageVersion>
-    <MicrosoftExtensionsPrimitivesPackageVersion>3.0.0-alpha1-10352</MicrosoftExtensionsPrimitivesPackageVersion>
+    <MicrosoftExtensionsFileProvidersPhysicalPackageVersion>3.0.0-alpha1-10382</MicrosoftExtensionsFileProvidersPhysicalPackageVersion>
+    <MicrosoftExtensionsPrimitivesPackageVersion>3.0.0-alpha1-10382</MicrosoftExtensionsPrimitivesPackageVersion>
     <MicrosoftNETCoreApp20PackageVersion>2.0.9</MicrosoftNETCoreApp20PackageVersion>
     <MicrosoftNETCoreApp21PackageVersion>2.1.2</MicrosoftNETCoreApp21PackageVersion>
     <MicrosoftNETCoreApp22PackageVersion>2.2.0-preview1-26618-02</MicrosoftNETCoreApp22PackageVersion>
@@ -16,7 +16,7 @@
     <MoqPackageVersion>4.7.49</MoqPackageVersion>
     <NETStandardLibrary20PackageVersion>2.0.3</NETStandardLibrary20PackageVersion>
     <NewtonsoftJsonPackageVersion>11.0.2</NewtonsoftJsonPackageVersion>
-    <SystemSecurityCryptographyXmlPackageVersion>4.6.0-preview1-26817-04</SystemSecurityCryptographyXmlPackageVersion>
+    <SystemSecurityCryptographyXmlPackageVersion>4.6.0-preview1-26828-04</SystemSecurityCryptographyXmlPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>
     <XunitRunnerVisualStudioPackageVersion>2.4.0</XunitRunnerVisualStudioPackageVersion>
   </PropertyGroup>

test/Config.KeyPerFile.Test/KeyPerFileTests.cs

@@ -28,7 +28,7 @@ namespace Microsoft.Extensions.Configuration.KeyPerFile.Test
         public void ThrowsWhenNotOptionalAndDirectoryDoesntExist()
         {
             var e = Assert.Throws<ArgumentException>(() => new ConfigurationBuilder().AddKeyPerFile("nonexistent", false).Build());
-            Assert.Contains("The directory name", e.Message);
+            Assert.Contains("The path must be absolute.", e.Message);
         }
 
         [Fact]
@@ -305,4 +305,4 @@ namespace Microsoft.Extensions.Configuration.KeyPerFile.Test
             return new MemoryStream(Encoding.UTF8.GetBytes(_contents));
         }
     }
-}
+}