create tests against test infrastructure

Author: ceastwood

QueryBuilder.Tests/InfrastructureTests.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Linq;
+using SqlKata.Compilers;
+using Xunit;
+
+namespace SqlKata.Tests.Infrastructure
+{
+    public class InfrastructureTests : TestSupport
+    {
+        [Fact]
+        public void CanGetCompiler()
+        {
+            var compiler = Compilers.Get(EngineCodes.SqlServer);
+
+            Assert.NotNull(compiler);
+            Assert.IsType<SqlServerCompiler>(compiler);
+        }
+
+        [Fact]
+        public void CanCompile()
+        {
+            var results = Compilers.Compile(new Query("Table"));
+
+            Assert.NotNull(results);
+            Assert.Equal(Compilers.KnownEngineCodes.Count(), results.Count);
+        }
+
+        [Fact]
+        public void CanCompileSelectively()
+        {
+            var desiredEngines = new[] {EngineCodes.SqlServer, EngineCodes.MySql};
+            var results = Compilers.Compile(desiredEngines, new Query("Table"));
+
+            Assert.Equal(desiredEngines.Length, results.Count);
+            Assert.Contains(results, a =>a.Key == EngineCodes.SqlServer);
+            Assert.Contains(results, a => a.Key == EngineCodes.MySql);
+        }
+
+
+        [Fact]
+        public void ShouldThrowIfInvalidEngineCode()
+        {
+            Assert.Throws<InvalidOperationException>(() => Compilers.CompileFor("XYZ", new Query()));
+        }
+
+        [Fact]
+        public void ShouldThrowIfAnyEngineCodesAreInvalid()
+        {
+            var codes = new[] {EngineCodes.SqlServer, "123", EngineCodes.MySql, "abc"};
+            Assert.Throws<InvalidOperationException>(() => Compilers.Compile(codes, new Query()));
+        }
+    }
+}