add poc ; add testing data

MidiMetronome.asmdef

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+{
+    "name": "MidiMetronome",
+    "rootNamespace": "",
+    "references": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "Melanchall.DryWetMidi.dll"
+    ],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Utility.Tests/GeneralTests.cs

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+using MidiMetronome;
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+public class GeneralTests
+{
+    readonly string[] MidiTestFiles = new string[]
+    {
+        "MIDI_sample",
+        "darude-sandstorm",
+        "dr.dre-still",
+        "Under-The-Sea-(From-'The-Little-Mermaid')"
+    };
+
+    [Test]
+    public void Dev()
+    {
+        var assets = AssetDatabase.FindAssets(nameof(GeneralTests))
+                                  .Select(guid => AssetDatabase.GUIDToAssetPath(guid))
+                                  .Select(path => AssetDatabase.LoadAssetAtPath<MonoScript>(path))
+                                  .Distinct();
+
+        var script = assets.FirstOrDefault();
+
+        if (script == null)
+            throw new Exception($"Can't locate the script in the project!");
+
+        var path = AssetDatabase.GetAssetPath(script);
+        var root = Path.GetDirectoryName(path);
+        var sampleDir = $@"{root}\Samples";
+
+        var midiFiles = Directory.GetFiles(sampleDir, "*.mid")
+                                 .Select(x => new { name = Path.GetFileName(x), rawMidi = File.ReadAllBytes(x) });
+
+        foreach (var x in midiFiles)
+            TestMidi(x.rawMidi, x.name);
+    }
+    void TestMidi(byte[] rawMidi, string name)
+    {
+
+        TickInfo[] ticks = null;
+
+        try
+        {
+            ticks = MetronomeUtility.GenerateBeats(rawMidi);
+        }
+        catch (Exception e)
+        {
+            Debug.LogError(name);
+            Debug.LogException(e);
+        }
+
+        if (ticks == null)
+            return;
+
+        Debug.Log($"{name}");
+
+        foreach (var x in ticks)
+        {
+            Debug.Log($"[{x.BPM:F0}] {x.Time:0.###}s");
+        }
+
+        Debug.Log("======================");
+    }
+}

Utility.Tests/MidiMetronome.Tests.asmdef

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+{
+    "name": "MidiMetronome.Tests",
+    "rootNamespace": "",
+    "references": [
+        "MidiMetronome"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "Melanchall.DryWetMidi.dll",
+        "nunit.framework.dll"
+    ],
+    "autoReferenced": false,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}