Add regression testing for snake case

Bonsai.Sgen.Tests/CasingGenerationTests.cs

@@ -0,0 +1,56 @@
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NJsonSchema;
+
+namespace Bonsai.Sgen.Tests
+{
+    [TestClass]
+    public class CasingGenerationTests
+    {
+        private static Task<JsonSchema> CreateTestSchema()
+        {
+            return JsonSchema.FromJsonAsync(@"
+{
+    ""$schema"": ""http://json-schema.org/draft-04/schema#"",
+    ""type"": ""object"",
+    ""title"": ""Container"",
+    ""properties"": {
+      ""base_type"": {
+        ""oneOf"": [
+          {
+            ""$ref"": ""#/definitions/thing_container""
+          },
+          {
+            ""type"": ""null""
+          }
+        ]
+      }
+    },
+    ""definitions"": {
+      ""thing_container"": {
+        ""type"": ""object"",
+        ""properties"": {
+          ""bar"": {
+            ""type"": [
+              ""null"",
+              ""string""
+            ]
+          }
+        }
+      }
+    }
+}
+");
+        }
+
+        [TestMethod]
+        public async Task GenerateFromSnakeCase_GeneratePascalCaseNames()
+        {
+            var schema = await CreateTestSchema();
+            var generator = TestHelper.CreateGenerator(schema);
+            var code = generator.GenerateFile();
+            Assert.IsTrue(code.Contains("public ThingContainer BaseType"), "Incorrect casing for property name.");
+            CompilerTestHelper.CompileFromSource(code);
+        }
+    }
+}