fix test runs in the same process

Author: zengin

src/GraphODataTemplateWriter/CodeHelpers/PHP/TypeHelperPHP.cs

@@ -203,7 +203,7 @@ public static string GetPHPNamespace(OdcmType currentType, TemplateWriterSetting
             var namespacePrefix = string.Empty;
             // TemplateWriterSettings.Properties are set at the Typewriter command line. Check the command line 
             // documentation for more information on how the TemplateWriterSettings.Properties is used.
-            if (settings.Properties.ContainsKey("php.namespacePrefix"))
+            if (settings.Properties?.ContainsKey("php.namespacePrefix") == true)
             {
                 namespacePrefix = settings.Properties["php.namespacePrefix"];
             }
@@ -262,7 +262,7 @@ public static string GetPHPEntityTypeReference(string @namespace, TemplateWriter
                 case "Beta\\Microsoft\\Graph\\Model":
                     return "Entity";
                 default:
-                    if (settings.Properties.ContainsKey("php.namespacePrefix"))
+                    if (settings.Properties?.ContainsKey("php.namespacePrefix") == true)
                     {
                         return $"\\{settings.Properties["php.namespacePrefix"]}\\Microsoft\\Graph\\Model\\Entity";
                     }

src/GraphODataTemplateWriter/PathWriters/PHPPathWriter.cs

@@ -46,7 +46,7 @@ private string CreateNamespace(string @namespace, string folderName)
 
             // TemplateWriterSettings.Properties are set at the Typewriter command line. Check the command line 
             // documentation for more information on how the TemplateWriterSettings.Properties is used.
-            if (ConfigurationService.Settings.Properties.ContainsKey("php.namespacePrefix"))
+            if (ConfigurationService.Settings.Properties?.ContainsKey("php.namespacePrefix") == true)
             {
                 namespaceBuilder.Append($"{ConfigurationService.Settings.Properties["php.namespacePrefix"]}."); // e.g. "com.Beta."
             }

src/GraphODataTemplateWriter/Settings/ConfigurationService.cs

@@ -4,6 +4,7 @@ namespace Microsoft.Graph.ODataTemplateWriter.Settings
 {
     using System;
     using System.Collections.Generic;
+    using System.Linq;
     using System.Reflection;
     using System.Reflection.Emit;
     using Vipr.Core;
@@ -105,7 +106,13 @@ public static TemplateWriterSettings Settings
         {
             get
             {
-                if (templateWriterSettings == null || templateWriterSettings.TargetLanguage != ConfigurationService.targetLanguage)
+                // settings are considered new if
+                // 1. templateWriterSettings are not initialized
+                // 2. targetLanguage or properties are different between templateWriterSettings and ConfigurationService
+                if (templateWriterSettings == null
+                    || templateWriterSettings.TargetLanguage != ConfigurationService.targetLanguage
+                    || (templateWriterSettings.Properties == null ^ ConfigurationService.properties == null) // when only one of them is null, they are different
+                    || (templateWriterSettings.Properties != null && templateWriterSettings.Properties.SequenceEqual(ConfigurationService.properties)))
                 {
                     templateWriterSettings = _configurationProvider != null
                         ? LoadSettingsForLanguage()

test/Typewriter.Test/MultipleNamespacesTestRunner.cs

@@ -62,11 +62,19 @@ string getMetadataFile(TestLanguage testLanguage)
             var outputDirectory = Path.Combine(currentDirectory, outputDirectoryName);
             var dataDirectory = Path.Combine(currentDirectory, testDataDirectoryName);
             var metadataFile = Path.Combine(currentDirectory, MetadataDirectoryName, getMetadataFile(language));
-            var typewriterParameters = $"-v Info -m {metadataFile} -o {outputDirectory} -g Files -l {languageStr}";
+
+            var csdlContents = MetadataResolver.GetMetadata(metadataFile);
+            var options = new Options
+            {
+                Verbosity = VerbosityLevel.Info,
+                Output = outputDirectory,
+                GenerationMode = GenerationMode.Files,
+                Language = languageStr
+            };
 
             if (isPhpBeta)
             {
-                typewriterParameters += " -p php.namespacePrefix:Beta";
+                options.Properties = new List<string> { "php.namespacePrefix:Beta" };
             }
 
             // Act
@@ -75,7 +83,7 @@ string getMetadataFile(TestLanguage testLanguage)
                 Directory.Delete(outputDirectory, recursive: true); // clean up any previous runs
             }
 
-            Program.Main(typewriterParameters.Split(' '));
+            Generator.GenerateFiles(csdlContents, options);
 
             // Assert
             var testOutputBuilder = new StringBuilder();