Add tests of MetadataSerializer

- #4914 (2 of probably 3 or 4)

nit: Use more `var`

Author: dougbu

src/Tools/Extensions.ApiDescription.Client/test/GetCurrentOpenApiReferenceTest.cs

@@ -13,7 +13,7 @@ public class GetCurrentOpenApiReferenceTest
         public void Execute_ReturnsExpectedItem()
         {
             // Arrange
-            string input = "Identity=../files/azureMonitor.json|ClassName=azureMonitorClient|" +
+            var input = "Identity=../files/azureMonitor.json|ClassName=azureMonitorClient|" +
                 "CodeGenerator=NSwagCSharp|Namespace=ConsoleClient|Options=|OutputPath=" +
                 "C:\\dd\\dnx\\AspNetCore\\artifacts\\obj\\ConsoleClient\\azureMonitorClient.cs|" +
                 "OriginalItemSpec=../files/azureMonitor.json|FirstForGenerator=true";
@@ -22,8 +22,8 @@ public void Execute_ReturnsExpectedItem()
                 Input = input,
             };
 
-            string expectedIdentity = "../files/azureMonitor.json";
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedIdentity = "../files/azureMonitor.json";
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", "azureMonitorClient" },
                 { "CodeGenerator", "NSwagCSharp" },

src/Tools/Extensions.ApiDescription.Client/test/GetOpenApiReferenceMetadataTest.cs

@@ -27,7 +27,7 @@ public void Execute_AddsExpectedMetadata()
                 OutputDirectory = "obj",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", "NSwagClient" },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -85,7 +85,7 @@ public void Execute_DoesNotOverrideClassName()
                 OutputDirectory = "obj",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -143,7 +143,7 @@ public void Execute_DoesNotOverrideNamespace()
                 OutputDirectory = "obj",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", "NSwagClient" },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -201,7 +201,7 @@ public void Execute_DoesNotOverrideOutputPath_IfRooted()
                 OutputDirectory = "bin",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -351,7 +351,7 @@ public void Execute_SetsClassName_BasedOnOutputPath()
                 OutputDirectory = "bin",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -414,7 +414,7 @@ public void Execute_SetsClassName_BasedOnSanitizedOutputPath(string outputPath,
                 OutputDirectory = "bin",
             };
 
-            IDictionary<string, string> expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className },
                 { "CodeGenerator", "NSwagCSharp" },
@@ -481,7 +481,7 @@ public void Execute_SetsFirstForGenerator_UsesCorrectExtension()
                 OutputDirectory = "obj",
             };
 
-            IDictionary<string, string> expectedMetadata1 = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata1 = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className12 },
                 { "CodeGenerator", codeGenerator13 },
@@ -496,7 +496,7 @@ public void Execute_SetsFirstForGenerator_UsesCorrectExtension()
                     $"OutputPath={outputPath1}|ClassName={className12}|Namespace={@namespace}"
                 },
             };
-            IDictionary<string, string> expectedMetadata2 = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata2 = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className12 },
                 { "CodeGenerator", codeGenerator2 },
@@ -511,7 +511,7 @@ public void Execute_SetsFirstForGenerator_UsesCorrectExtension()
                     $"OutputPath={outputPath2}|ClassName={className12}|Namespace={@namespace}"
                 },
             };
-            IDictionary<string, string> expectedMetadata3 = new SortedDictionary<string, string>(StringComparer.Ordinal)
+            var expectedMetadata3 = new SortedDictionary<string, string>(StringComparer.Ordinal)
             {
                 { "ClassName", className3 },
                 { "CodeGenerator", codeGenerator13 },