feat: add BeOneOf for numbers (#136)

Implement #134

Author: vbreuss

Source/Testably.Expectations/That/Numbers/ThatNumberShould.BeOneOf.cs

@@ -141,6 +141,52 @@ public static IThat<decimal> Should(this IExpectSubject<decimal> subject)
 	public static IThat<decimal?> Should(this IExpectSubject<decimal?> subject)
 		=> subject.Should(_ => { });
 
+	private readonly struct GenericArrayConstraint<T>(
+		T?[] expected,
+		Func<T?[], string> expectation,
+		Func<T, T?[], bool> condition,
+		Func<T, T?[], string> failureMessageFactory)
+		: IValueConstraint<T>
+		where T : struct
+	{
+		public ConstraintResult IsMetBy(T actual)
+		{
+			if (condition(actual, expected))
+			{
+				return new ConstraintResult.Success<T>(actual, ToString());
+			}
+
+			return new ConstraintResult.Failure(ToString(),
+				failureMessageFactory(actual, expected));
+		}
+
+		public override string ToString()
+			=> expectation(expected);
+	}
+
+	private readonly struct GenericArrayConstraint2<T>(
+		T[] expected,
+		Func<T[], string> expectation,
+		Func<T, T[], bool> condition,
+		Func<T, T[], string> failureMessageFactory)
+		: IValueConstraint<T>
+		where T : struct
+	{
+		public ConstraintResult IsMetBy(T actual)
+		{
+			if (condition(actual, expected))
+			{
+				return new ConstraintResult.Success<T>(actual, ToString());
+			}
+
+			return new ConstraintResult.Failure(ToString(),
+				failureMessageFactory(actual, expected));
+		}
+
+		public override string ToString()
+			=> expectation(expected);
+	}
+
 	private readonly struct GenericConstraint<T>(
 		T? expected,
 		Func<T?, string> expectation,
@@ -186,4 +232,50 @@ public ConstraintResult IsMetBy(T? actual)
 		public override string ToString()
 			=> expectation(expected);
 	}
+
+	private readonly struct NullableGenericArrayConstraint<T>(
+		T?[] expected,
+		Func<T?[], string> expectation,
+		Func<T?, T?[], bool> condition,
+		Func<T?, T?[], string> failureMessageFactory)
+		: IValueConstraint<T?>
+		where T : struct
+	{
+		public ConstraintResult IsMetBy(T? actual)
+		{
+			if (condition(actual, expected))
+			{
+				return new ConstraintResult.Success<T?>(actual, ToString());
+			}
+
+			return new ConstraintResult.Failure(ToString(),
+				failureMessageFactory(actual, expected));
+		}
+
+		public override string ToString()
+			=> expectation(expected);
+	}
+
+	private readonly struct NullableGenericArrayConstraint2<T>(
+		T[] expected,
+		Func<T[], string> expectation,
+		Func<T?, T[], bool> condition,
+		Func<T?, T[], string> failureMessageFactory)
+		: IValueConstraint<T?>
+		where T : struct
+	{
+		public ConstraintResult IsMetBy(T? actual)
+		{
+			if (condition(actual, expected))
+			{
+				return new ConstraintResult.Success<T?>(actual, ToString());
+			}
+
+			return new ConstraintResult.Failure(ToString(),
+				failureMessageFactory(actual, expected));
+		}
+
+		public override string ToString()
+			=> expectation(expected);
+	}
 }