C#: Make some FileContent unit tests.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp.Standalone/FileContent.cs

@@ -163,4 +163,4 @@ public IEnumerable<string> ReadLines(string file)
             yield return line;
         }
     }
-}
+}

csharp/extractor/Semmle.Extraction.Tests/FileContent.cs

@@ -0,0 +1,95 @@
+using Xunit;
+using Semmle.BuildAnalyser;
+using Semmle.Util.Logging;
+using System.Collections.Generic;
+
+namespace Semmle.Extraction.Tests
+{
+
+    internal class LoggerStub : ILogger
+    {
+        public void Log(Severity severity, string message) { }
+
+        public void Dispose() { }
+    }
+
+    internal class UnsafeFileReaderStub : IUnsafeFileReader
+    {
+        private readonly List<string> lines;
+
+        public UnsafeFileReaderStub(List<string> lines)
+        {
+            this.lines = lines;
+        }
+
+        public IEnumerable<string> ReadLines(string file)
+        {
+            foreach (var line in lines)
+            {
+                yield return line;
+            }
+        }
+    }
+
+    internal class TestFileContent : FileContent
+    {
+        public TestFileContent(List<string> lines) : base(() => new HashSet<string>(),
+            new ProgressMonitor(new LoggerStub()),
+            () => new List<string>() { "test1.cs" },
+            new UnsafeFileReaderStub(lines))
+        { }
+    }
+
+    public class FileContentTests
+    {
+        [Fact]
+        public void TestFileContent1()
+        {
+            // Setup
+            var lines = new List<string>()
+            {
+                "<Project Sdk=\"Microsoft.NET.Sdk\">",
+                "<PackageReference Include=\"DotNetAnalyzers.DocumentationAnalyzers\" Version=\"1.0.0-beta.59\" PrivateAssets=\"all\" />",
+                "<PackageReference Version=\"7.0.0\" Include=\"Microsoft.CodeAnalysis.NetAnalyzers\"PrivateAssets=\"all\" />",
+                "<PackageReference Include=\"StyleCop.Analyzers\" Version=\"1.2.0-beta.406\">",
+                "<FrameworkReference Include=\"My.Framework\"/>"
+            };
+            var fileContent = new TestFileContent(lines);
+
+            // Execute
+            var notYetDownloadedPackages = fileContent.NotYetDownloadedPackages;
+            var useAspNetDlls = fileContent.UseAspNetDlls;
+
+            // Verify
+            Assert.False(useAspNetDlls);
+            Assert.Equal(3, notYetDownloadedPackages.Count);
+            Assert.Contains("DotNetAnalyzers.DocumentationAnalyzers".ToLowerInvariant(), notYetDownloadedPackages);
+            Assert.Contains("Microsoft.CodeAnalysis.NetAnalyzers".ToLowerInvariant(), notYetDownloadedPackages);
+            Assert.Contains("StyleCop.Analyzers".ToLowerInvariant(), notYetDownloadedPackages);
+        }
+
+        [Fact]
+        public void TestFileContent2()
+        {
+            // Setup
+            var lines = new List<string>()
+                {
+                    "<Project Sdk=\"Microsoft.NET.Sdk.Web\">",
+                    "<FrameworkReference Include=\"My.Framework\"/>",
+                    "<PackageReference Version=\"7.0.0\" Include=\"Microsoft.CodeAnalysis.NetAnalyzers\"PrivateAssets=\"all\" />",
+                    "<PackageReference Include=\"StyleCop.Analyzers\" Version=\"1.2.0-beta.406\">"
+                };
+            var fileContent = new TestFileContent(lines);
+
+            // Execute
+            var useAspNetDlls = fileContent.UseAspNetDlls;
+            var notYetDownloadedPackages = fileContent.NotYetDownloadedPackages;
+
+            // Verify
+            Assert.True(useAspNetDlls);
+            Assert.Equal(2, notYetDownloadedPackages.Count);
+            Assert.Contains("Microsoft.CodeAnalysis.NetAnalyzers".ToLowerInvariant(), notYetDownloadedPackages);
+            Assert.Contains("StyleCop.Analyzers".ToLowerInvariant(), notYetDownloadedPackages);
+        }
+    }
+}

csharp/extractor/Semmle.Util/Initializer.cs

@@ -25,4 +25,4 @@ public void Run()
             var _ = doInit.Value;
         }
     }
-}
+}