Added tests for Program class

MavenVersionChecker.Action.Tests/ProgramTests.cs

@@ -0,0 +1,75 @@
+/*
+ * This file is part of Maven Version Checker <https://github.com/StevenJDH/maven-version-checker>.
+ * Copyright (C) 2024 Steven Jenkins De Haro.
+ *
+ * Maven Version Checker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Maven Version Checker is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Maven Version Checker.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System.Reflection;
+
+namespace MavenVersionChecker.Action.Tests;
+
+[TestFixture]
+public class ProgramTests
+{
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        Environment.SetEnvironmentVariable("INPUT_LOCATION", null);
+    }
+
+    [Test, Description("Should load and exit when no location input is provided.")]
+    public async Task Should_LoadAndExit_When_NoLocationInputIsProvided()
+    {
+        var program = typeof(Program).GetTypeInfo();
+        var mainMethod = program.DeclaredMethods.Single(m => m.Name == "<Main>$");
+        var originalConsoleOut = Console.Out;
+        await using var sw = new StringWriter();
+        Console.SetOut(sw);
+        const string expectedMessage = "::error::Required input not supplied. (Parameter 'location')";
+
+        int exitCode = await (Task<int>) mainMethod.Invoke(null, [Array.Empty<string>()])!;
+        string output = sw.ToString();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(exitCode, Is.EqualTo(1));
+            Assert.That(output, Contains.Substring(expectedMessage));
+        });
+
+        Console.SetOut(originalConsoleOut);
+    }
+
+    [Test, Description("Should have matching version in console for version defined in assembly.")]
+    public async Task Should_HaveMatchingVersionInConsole_ForVersionDefinedInAssembly()
+    {
+        var program = typeof(Program).GetTypeInfo();
+        var mainMethod = program.DeclaredMethods.Single(m => m.Name == "<Main>$");
+        var originalConsoleOut = Console.Out;
+        await using var sw = new StringWriter();
+        Console.SetOut(sw);
+        string expectedTitleVersion = $"Maven Version Checker {typeof(Program).Assembly.GetName().Version!.ToString()}";
+
+        int exitCode = await (Task<int>)mainMethod.Invoke(null, [Array.Empty<string>()])!;
+        string output = sw.ToString();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(exitCode, Is.EqualTo(1));
+            Assert.That(output, Contains.Substring(expectedTitleVersion));
+        });
+
+        Console.SetOut(originalConsoleOut);
+    }
+}