Nearly working version

AspectedRouting.Test/FunctionsTest.cs

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+using System.Collections.Generic;
+using AspectedRouting.IO.jsonParser;
+using AspectedRouting.Language;
+using AspectedRouting.Language.Expression;
+using AspectedRouting.Language.Functions;
+using Xunit;
+
+namespace AspectedRouting.Test
+{
+    public class FunctionsTest
+    {
+        private IExpression MustMatchJson()
+        {
+            var json = "{" +
+                       "\"name\":\"test\"," +
+                       "\"description\":\"test\"," +
+                       "\"$mustMatch\":{\"a\":\"b\",\"x\":\"y\"}}";
+            return JsonParser.AspectFromJson(new Context(), json, "test.json");
+        }
+
+
+        [Fact]
+        public void TestAll_AllTags_Yes()
+        {
+            var tagsAx = new Dictionary<string, string>
+            {
+                {"a", "b"},
+                {"x", "y"}
+            };
+
+            var expr = new Apply(MustMatchJson(), new Constant(tagsAx)).Optimize();
+            var result = expr.Evaluate(new Context());
+            Assert.Equal("yes", result);
+        }
+
+        [Fact]
+        public void TestAll_NoMatch_No()
+        {
+            var tagsAx = new Dictionary<string, string>
+            {
+                {"a", "b"},
+            };
+
+            var expr = new Apply(MustMatchJson(), new Constant(tagsAx)).Optimize();
+            var result = expr.Evaluate(new Context());
+            Assert.Equal("no", result);
+        }
+
+        [Fact]
+        public void TestAll_NoMatchDifferent_No()
+        {
+            var tagsAx = new Dictionary<string, string>
+            {
+                {"a", "b"},
+                {"x", "someRandomValue"}
+            };
+
+            var expr = new Apply(MustMatchJson(), new Constant(tagsAx)).Optimize();
+            var result = expr.Evaluate(new Context());
+            Assert.Equal("no", result);
+        }
+    }
+}