Refactor (#94)

CliFx.Analyzers.Tests/GeneralSpecs.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Linq;
+using FluentAssertions;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Xunit;
+
+namespace CliFx.Analyzers.Tests
+{
+    public class GeneralSpecs
+    {
+        [Fact]
+        public void All_analyzers_have_unique_diagnostic_IDs()
+        {
+            // Arrange
+            var analyzers = typeof(AnalyzerBase)
+                .Assembly
+                .GetTypes()
+                .Where(t => !t.IsAbstract && t.IsAssignableTo(typeof(DiagnosticAnalyzer)))
+                .Select(t => (DiagnosticAnalyzer) Activator.CreateInstance(t)!)
+                .ToArray();
+
+            // Act
+            var diagnosticIds = analyzers
+                .SelectMany(a => a.SupportedDiagnostics.Select(d => d.Id))
+                .ToArray();
+
+            // Assert
+            diagnosticIds.Should().OnlyHaveUniqueItems();
+        }
+    }
+}