diff --git a/test/NetLah.Extensions.Configuration.Test/ConfigurationBuilderBuilderTest.cs b/test/NetLah.Extensions.Configuration.Test/ConfigurationBuilderBuilderTest.cs
index e89a950..f7bb254 100644
--- a/test/NetLah.Extensions.Configuration.Test/ConfigurationBuilderBuilderTest.cs
+++ b/test/NetLah.Extensions.Configuration.Test/ConfigurationBuilderBuilderTest.cs
@@ -935,7 +935,7 @@ public void ConfigurationSourceDevelopmentSecrets_NoSources()
     {
         var configuration = ConfigurationBuilderBuilder.Create<ConfigurationBuilderBuilderTest>()
             .WithEnvironment("Development")
-            .WithAddPostConfiguration(builder => builder.AddConfigurationSource())
+            .WithConfigurationSource()
             .BuildConfigurationRoot();
 
         AssertProviders(configuration, new[] {
@@ -955,4 +955,159 @@ public void ConfigurationSourceDevelopmentSecrets_NoSources()
         AssertDevelopment(configuration);
     }
 
+    [Fact]
+    public void ConfigurationSourceProduction_configJson()
+    {
+        var configuration = ConfigurationBuilderBuilder.Create(
+            new string[] {
+                "/ConfigurationSource:0=Other-Config-Source/config.json"
+            })
+            .WithConfigurationSource()
+            .BuildConfigurationRoot();
+
+        AssertProviders(configuration, new[] {
+                "JsonConfigurationProvider",
+                "JsonConfigurationProvider",
+                "ChainedConfigurationProvider",
+                "EnvironmentVariablesConfigurationProvider",
+                "CommandLineConfigurationProvider",
+            }, new[] {
+                "appsettings.json",
+                "appsettings.Production.json",
+                null,
+                null,
+                null,
+            });
+
+        Assert.Equal("EnvironmentProductionValue1", configuration["EnvironmentKey"]);
+        Assert.Equal("Other-Config-Source/config.json", configuration["MainKey"]);
+        Assert.Equal("config.json", configuration["JsonSection:Other-Config-Source"]);
+    }
+
+    [Fact]
+    public void ConfigurationSourceProduction_configJsonIni()
+    {
+        var configuration = ConfigurationBuilderBuilder.Create(
+            new string[] {
+                "/ConfigurationSource:0=Other-Config-Source/config.json",
+                "/ConfigurationSource:1=Other-Config-Source/config.ini",
+            })
+            .WithConfigurationSource()
+            .BuildConfigurationRoot();
+
+        AssertProviders(configuration, new[] {
+                "JsonConfigurationProvider",
+                "JsonConfigurationProvider",
+                "ChainedConfigurationProvider",
+                "EnvironmentVariablesConfigurationProvider",
+                "CommandLineConfigurationProvider",
+            }, new[] {
+                "appsettings.json",
+                "appsettings.Production.json",
+                null,
+                null,
+                null,
+            });
+
+        Assert.Equal("EnvironmentProductionValue1", configuration["EnvironmentKey"]);
+        Assert.Equal("Other-Config-Source/config.ini", configuration["MainKey"]);
+        Assert.Equal("config.json", configuration["JsonSection:Other-Config-Source"]);
+        Assert.Equal("config.ini", configuration["IniSection:Other-Config-Source"]);
+    }
+
+    [Fact]
+    public void ConfigurationSourceProduction_configIniJson()
+    {
+        var configuration = ConfigurationBuilderBuilder.Create(
+            new string[] {
+                "/ConfigurationSource:0=Other-Config-Source/config.ini",
+                "/ConfigurationSource:1=Other-Config-Source/config.json",
+            })
+            .WithConfigurationSource()
+            .BuildConfigurationRoot();
+
+        AssertProviders(configuration, new[] {
+                "JsonConfigurationProvider",
+                "JsonConfigurationProvider",
+                "ChainedConfigurationProvider",
+                "EnvironmentVariablesConfigurationProvider",
+                "CommandLineConfigurationProvider",
+            }, new[] {
+                "appsettings.json",
+                "appsettings.Production.json",
+                null,
+                null,
+                null,
+            });
+
+        Assert.Equal("EnvironmentProductionValue1", configuration["EnvironmentKey"]);
+        Assert.Equal("Other-Config-Source/config.json", configuration["MainKey"]);
+        Assert.Equal("config.json", configuration["JsonSection:Other-Config-Source"]);
+        Assert.Equal("config.ini", configuration["IniSection:Other-Config-Source"]);
+    }
+
+    [Fact]
+    public void ConfigurationSourceProduction_configIniJsonXml()
+    {
+        var configuration = ConfigurationBuilderBuilder.Create(
+            new string[] {
+                "/ConfigurationSource:0=Other-Config-Source/config.ini",
+                "/ConfigurationSource:1=Other-Config-Source/config.json",
+                "/ConfigurationSource:2=Other-Config-Source/config.xml",
+            })
+            .WithConfigurationSource()
+            .BuildConfigurationRoot();
+
+        AssertProviders(configuration, new[] {
+                "JsonConfigurationProvider",
+                "JsonConfigurationProvider",
+                "ChainedConfigurationProvider",
+                "EnvironmentVariablesConfigurationProvider",
+                "CommandLineConfigurationProvider",
+            }, new[] {
+                "appsettings.json",
+                "appsettings.Production.json",
+                null,
+                null,
+                null,
+            });
+
+        Assert.Equal("EnvironmentProductionValue1", configuration["EnvironmentKey"]);
+        Assert.Equal("Other-Config-Source/config.xml", configuration["MainKey"]);
+        Assert.Equal("config.json", configuration["JsonSection:Other-Config-Source"]);
+        Assert.Equal("config.ini", configuration["IniSection:Other-Config-Source"]);
+        Assert.Equal("config.xml", configuration["XmlSection:Other-Config-Source"]);
+    }
+
+    [Fact]
+    public void ConfigurationSource_Transform()
+    {
+        var configuration = ConfigurationBuilderBuilder.Create(
+            new string[] {
+                "/configSrc:0=appsettings.Transform.json",
+            })
+            .WithConfigurationSource("configSrc")
+            .WithTransformConfiguration()
+            .BuildConfigurationRoot();
+
+        AssertProviders(configuration, new[] {
+                "JsonConfigurationProvider",
+                "JsonConfigurationProvider",
+                "ChainedConfigurationProvider",
+                "EnvironmentVariablesConfigurationProvider",
+                "CommandLineConfigurationProvider",
+                "TransformConfigurationProvider",
+            }, new[] {
+                "appsettings.json",
+                "appsettings.Production.json",
+                null,
+                null,
+                null,
+                null,
+            });
+
+        AssertProduction(configuration);
+        AssertTransform(configuration);
+    }
+
 }
diff --git a/test/NetLah.Extensions.Configuration.Test/NetLah.Extensions.Configuration.Test.csproj b/test/NetLah.Extensions.Configuration.Test/NetLah.Extensions.Configuration.Test.csproj
index deef18a..405962f 100644
--- a/test/NetLah.Extensions.Configuration.Test/NetLah.Extensions.Configuration.Test.csproj
+++ b/test/NetLah.Extensions.Configuration.Test/NetLah.Extensions.Configuration.Test.csproj
@@ -15,7 +15,8 @@
 
   <ItemGroup>
     <Content Include="appsettings.*" CopyToOutputDirectory="PreserveNewest" />
-    <Content Include="New-Location\*.json" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="New-Location/*.json" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="Other-Config-Source/**" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.ini b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.ini
new file mode 100644
index 0000000..d3179d9
--- /dev/null
+++ b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.ini
@@ -0,0 +1,4 @@
+MainKey = "Other-Config-Source/config.ini"
+
+[IniSection]
+Other-Config-Source = config.ini
diff --git a/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.json b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.json
new file mode 100644
index 0000000..e14b95e
--- /dev/null
+++ b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.json
@@ -0,0 +1,6 @@
+{
+  "MainKey": "Other-Config-Source/config.json",
+  "JsonSection": {
+    "Other-Config-Source": "config.json"
+  }
+}
diff --git a/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.xml b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.xml
new file mode 100644
index 0000000..d4c2191
--- /dev/null
+++ b/test/NetLah.Extensions.Configuration.Test/Other-Config-Source/config.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <MainKey>Other-Config-Source/config.xml</MainKey>
+  <XmlSection>
+    <Other-Config-Source>config.xml</Other-Config-Source>
+  </XmlSection>
+</configuration>
diff --git a/test/NetLah.Extensions.Configuration.Test/appsettings.ini b/test/NetLah.Extensions.Configuration.Test/appsettings.ini
index 0874a9d..ecd111d 100644
--- a/test/NetLah.Extensions.Configuration.Test/appsettings.ini
+++ b/test/NetLah.Extensions.Configuration.Test/appsettings.ini
@@ -1,4 +1,4 @@
 IniKey1="ini Value2"
 
 [IniSection3:Section4]
-Key5 = Value6
\ No newline at end of file
+Key5 = Value6
diff --git a/test/NetLah.Extensions.Configuration.Test/appsettings.xml b/test/NetLah.Extensions.Configuration.Test/appsettings.xml
index 8ce213f..3b9f52c 100644
--- a/test/NetLah.Extensions.Configuration.Test/appsettings.xml
+++ b/test/NetLah.Extensions.Configuration.Test/appsettings.xml
@@ -4,4 +4,4 @@
   <XmlSection3>
     <Key4>Value5</Key4>
   </XmlSection3>
-</configuration>
\ No newline at end of file
+</configuration>