Import code from previous AssetBuilder version

test/ZoneCodeGeneratorTests/Parsing/Matching/Matchers/MatcherGroupOptionalTest.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+using ZoneCodeGenerator.Parsing;
+using ZoneCodeGenerator.Parsing.Matching;
+using ZoneCodeGenerator.Parsing.Matching.Matchers;
+
+namespace ZoneCodeGeneratorTests.Parsing.Matching.Matchers
+{
+    [TestClass]
+    public class MatcherGroupOptionalTest
+    {
+        private Mock<ILexer> lexerMock;
+        private MatchingContext matchingContext;
+
+        [TestInitialize]
+        public void Setup()
+        {
+            lexerMock = new Mock<ILexer>();
+            matchingContext = new MatchingContext(lexerMock.Object, new Dictionary<string, TokenMatcher>());
+        }
+
+        [TestMethod]
+        public void EnsureIsSuccessfulWhenMatcherIsSuccessful()
+        {
+            var matcherGroup = new MatcherGroupOptional(new TestMatcher(true, 5));
+
+            var result = matcherGroup.Test(matchingContext, 0);
+
+            Assert.IsTrue(result.Successful);
+            Assert.AreEqual(5, result.ConsumedTokenCount);
+        }
+
+        [TestMethod]
+        public void EnsureIsSuccessfulWhenMatcherIsUnsuccessful()
+        {
+            var matcherGroup = new MatcherGroupOptional(new TestMatcher(false, 0));
+
+            var result = matcherGroup.Test(matchingContext, 0);
+
+            Assert.IsTrue(result.Successful);
+            Assert.AreEqual(0, result.ConsumedTokenCount);
+        }
+    }
+}