Add extensive tests

osu.Game.Tests/Beatmaps/Formats/ParsingTest.cs

@@ -0,0 +1,72 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Globalization;
+using NUnit.Framework;
+using osu.Game.Beatmaps.Formats;
+
+namespace osu.Game.Tests.Beatmaps.Formats
+{
+    [TestFixture]
+    public class ParsingTest
+    {
+        [Test]
+        public void TestNaNHandling() => allThrow<FormatException>("NaN");
+
+        [Test]
+        public void TestBadStringHandling() => allThrow<FormatException>("Random string 123");
+
+        [TestCase(Parsing.MAX_PARSE_VALUE)]
+        [TestCase(-1)]
+        [TestCase(0)]
+        [TestCase(1)]
+        [TestCase(-Parsing.MAX_PARSE_VALUE)]
+        [TestCase(10, 10)]
+        [TestCase(-10, 10)]
+        public void TestValidRanges(double input, double limit = Parsing.MAX_PARSE_VALUE)
+        {
+            Assert.AreEqual(Parsing.ParseInt((input).ToString(CultureInfo.InvariantCulture), (int)limit), (int)input);
+            Assert.AreEqual(Parsing.ParseFloat((input).ToString(CultureInfo.InvariantCulture), (float)limit), (float)input);
+            Assert.AreEqual(Parsing.ParseDouble((input).ToString(CultureInfo.InvariantCulture), limit), input);
+        }
+
+        [TestCase(double.PositiveInfinity)]
+        [TestCase(double.NegativeInfinity)]
+        [TestCase(999999999999)]
+        [TestCase(Parsing.MAX_PARSE_VALUE * 1.1)]
+        [TestCase(-Parsing.MAX_PARSE_VALUE * 1.1)]
+        [TestCase(11, 10)]
+        [TestCase(-11, 10)]
+        public void TestOutOfRangeHandling(double input, double limit = Parsing.MAX_PARSE_VALUE)
+            => allThrow<OverflowException>(input.ToString(CultureInfo.InvariantCulture), limit);
+
+        private void allThrow<T>(string input, double limit = Parsing.MAX_PARSE_VALUE)
+            where T : Exception
+        {
+            Assert.Throws(getIntParseException(input) ?? typeof(T), () => Parsing.ParseInt(input, (int)limit));
+            Assert.Throws<T>(() => Parsing.ParseFloat(input, (float)limit));
+            Assert.Throws<T>(() => Parsing.ParseDouble(input, limit));
+        }
+
+        /// <summary>
+        /// <see cref="int"/> may not be able to parse some inputs.
+        /// In this case we expect to receive the raw parsing exception.
+        /// </summary>
+        /// <param name="input">The input attempting to be parsed.</param>
+        /// <returns>The type of exception thrown by <see cref="int.Parse(string)"/>. Null if no exception is thrown.</returns>
+        private Type getIntParseException(string input)
+        {
+            try
+            {
+                var _ = int.Parse(input);
+            }
+            catch (Exception e)
+            {
+                return e.GetType();
+            }
+
+            return null;
+        }
+    }
+}