add estimator extension tests (dotnet#24)

Author: daholste

src/AutoML/EstimatorExtensions/EstimatorExtensions.cs

@@ -1,8 +1,5 @@
-using System;
-using System.Collections.Generic;
-using Microsoft.ML.Core.Data;
+using Microsoft.ML.Core.Data;
 using Microsoft.ML.Data;
-using Microsoft.ML.Transforms;
 using Microsoft.ML.Transforms.Categorical;
 using Microsoft.ML.Transforms.Conversions;
 

src/Test/EstimatorExtensionTests.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Linq;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Microsoft.ML.Auto.Test
+{
+    [TestClass]
+    public class EstimatorExtensionTests
+    {
+        [TestMethod]
+        public void EstimatorExtensionInstanceTests()
+        {
+            var context = new MLContext();
+            var pipelineNode = new PipelineNode()
+            {
+                InColumns = new string[] { "Input" },
+                OutColumns = new string[] { "Output" }
+            };
+
+            var estimatorNames = Enum.GetValues(typeof(EstimatorName)).Cast<EstimatorName>();
+            foreach (var estimatorName in estimatorNames)
+            {
+                var extension = EstimatorExtensionCatalog.GetExtension(estimatorName);
+                var instance = extension.CreateInstance(context, pipelineNode);
+                Assert.IsNotNull(instance);
+            }
+        }
+
+        [TestMethod]
+        public void EstimatorExtensionStaticTests()
+        {
+            var context = new MLContext();
+            var inCol = "Input";
+            var outCol = "Output";
+            var inCols = new string[] { inCol };
+            var outCols = new string[] { outCol };
+            Assert.IsNotNull(ColumnConcatenatingExtension.CreateSuggestedTransform(context, inCols, outCol));
+            Assert.IsNotNull(ColumnCopyingExtension.CreateSuggestedTransform(context, inCol, outCol));
+            Assert.IsNotNull(MissingValueIndicatorExtension.CreateSuggestedTransform(context, inCols, outCols));
+            Assert.IsNotNull(NormalizingExtension.CreateSuggestedTransform(context, inCol, outCol));
+            Assert.IsNotNull(OneHotEncodingExtension.CreateSuggestedTransform(context, inCols, outCols));
+            Assert.IsNotNull(OneHotHashEncodingExtension.CreateSuggestedTransform(context, inCols, outCols));
+            Assert.IsNotNull(TextFeaturizingExtension.CreateSuggestedTransform(context, inCol, outCol));
+            Assert.IsNotNull(TypeConvertingExtension.CreateSuggestedTransform(context, inCols, outCols));
+            Assert.IsNotNull(ValueToKeyMappingExtension.CreateSuggestedTransform(context, inCol, outCol));
+        }
+    }
+}