diff --git a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
index 94f0b2e9b..f27aa7ec5 100644
--- a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
+++ b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
@@ -41,6 +41,7 @@
     <Compile Include="StructuralTypes.fs" />
     <Compile Include="BaseTypesHtmlDocument.fs" />
     <Compile Include="XmlExtensions.fs" />
+    <Compile Include="InferenceEngines.fs" />
     <Compile Include="WorldBankRuntime.fs" />
     <Compile Include="Program.fs" />
   </ItemGroup>
diff --git a/tests/FSharp.Data.Core.Tests/InferenceEngines.fs b/tests/FSharp.Data.Core.Tests/InferenceEngines.fs
new file mode 100644
index 000000000..967083542
--- /dev/null
+++ b/tests/FSharp.Data.Core.Tests/InferenceEngines.fs
@@ -0,0 +1,208 @@
+module FSharp.Data.Tests.InferenceEngines
+
+open NUnit.Framework
+open FsUnit
+open System
+open System.Globalization
+open System.Xml.Linq
+open System.Reflection
+open FSharp.Data
+open FSharp.Data.Runtime
+open FSharp.Data.Runtime.StructuralTypes
+open FSharp.Data.Runtime.StructuralInference
+
+// Test JsonInference functionality through reflection since it's an internal module
+[<Test>]
+let ``JsonInference.inferType handles null values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    jsonInferenceModule |> should not' (be null)
+    
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    inferTypeMethod |> should not' (be null)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonNull = JsonValue.Null
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonNull |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles boolean values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonBool = JsonValue.Boolean true
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonBool |])
+    result |> should not' (be null)
+    
+[<Test>]
+let ``JsonInference.inferType handles string values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonString = JsonValue.String "hello"
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonString |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles integer number values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonNumber = JsonValue.Number 42M
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonNumber |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles decimal number values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonNumber = JsonValue.Number 42.5M
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonNumber |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles float values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonFloat = JsonValue.Float 3.14
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonFloat |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles Bit0 special case correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonZero = JsonValue.Number 0M
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonZero |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles Bit1 special case correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonOne = JsonValue.Number 1M
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonOne |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles array values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonArray = JsonValue.Array [| JsonValue.Number 1M; JsonValue.Number 2M |]
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonArray |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles record values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonRecord = JsonValue.Record [| ("name", JsonValue.String "John"); ("age", JsonValue.Number 30M) |]
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonRecord |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles NoInference mode correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.NoInference
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let jsonNumber = JsonValue.Number 0M // Should not infer Bit0 in NoInference mode
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; jsonNumber |])
+    result |> should not' (be null)
+
+[<Test>]
+let ``JsonInference.inferType handles large integer values correctly`` () =
+    let jsonInferenceModule = 
+        typeof<JsonValue>.Assembly.GetType("ProviderImplementation.JsonInference")
+    let inferTypeMethod = 
+        jsonInferenceModule.GetMethod("inferType", BindingFlags.Static ||| BindingFlags.Public ||| BindingFlags.NonPublic)
+    
+    let unitsOfMeasureProvider = null
+    let inferenceMode = InferenceMode'.ValuesOnly
+    let cultureInfo = CultureInfo.InvariantCulture
+    let parentName = "test"
+    let largeNumber = JsonValue.Number (decimal Int64.MaxValue)
+    
+    let result = inferTypeMethod.Invoke(null, [| unitsOfMeasureProvider; inferenceMode; cultureInfo; parentName; largeNumber |])
+    result |> should not' (be null)
\ No newline at end of file