Rework tests from 1-to-1 mapping into specifications (#46)

CliFx.Tests/ArgumentBindingSpecs.Types.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace CliFx.Tests
+{
+    public partial class ArgumentBindingSpecs
+    {
+        private enum CustomEnum
+        {
+            Value1 = 1,
+            Value2 = 2,
+            Value3 = 3
+        }
+
+        private class StringConstructable
+        {
+            public string Value { get; }
+
+            public StringConstructable(string value)
+            {
+                Value = value;
+            }
+        }
+
+        private class StringParseable
+        {
+            public string Value { get; }
+
+            private StringParseable(string value)
+            {
+                Value = value;
+            }
+
+            public static StringParseable Parse(string value) => new StringParseable(value);
+        }
+
+        private class StringParseableWithFormatProvider
+        {
+            public string Value { get; }
+
+            private StringParseableWithFormatProvider(string value)
+            {
+                Value = value;
+            }
+
+            public static StringParseableWithFormatProvider Parse(string value, IFormatProvider formatProvider) =>
+                new StringParseableWithFormatProvider(value + " " + formatProvider);
+        }
+
+        private class DummyType
+        {
+        }
+
+        public class CustomEnumerable<T> : IEnumerable<T>
+        {
+            private readonly T[] _arr = new T[0];
+
+            public IEnumerator<T> GetEnumerator() => ((IEnumerable<T>) _arr).GetEnumerator();
+
+            IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+        }
+    }
+}