1 files changed, 88 insertions, 0 deletions

diff --git a/src/internal/WixBuildTools.TestSupport/Builder.cs b/src/internal/WixBuildTools.TestSupport/Builder.cs
index ef0de8c9..31df0084 100644
--- a/src/internal/WixBuildTools.TestSupport/Builder.cs
+++ b/src/internal/WixBuildTools.TestSupport/Builder.cs
@@ -66,5 +66,93 @@ namespace WixBuildTools.TestSupport
                 return Query.QueryDatabase(outputPath, tables);
             }
         }
+
+        public void BuildAndDecompileAndBuild(Action<string[]> buildFunc, Action<string[]> decompileFunc, string decompilePath)
+        {
+            var sourceFiles = Directory.GetFiles(this.SourceFolder, "*.wxs");
+            var wxlFiles = Directory.GetFiles(this.SourceFolder, "*.wxl");
+
+            using (var fs = new DisposableFileSystem())
+            {
+                var intermediateFolder = fs.GetFolder();
+                var outputFolder = Path.Combine(intermediateFolder, "bin");
+                var decompileExtractFolder = Path.Combine(intermediateFolder, "decompiled", "extract");
+                var decompileIntermediateFolder = Path.Combine(intermediateFolder, "decompiled", "obj");
+                var decompileBuildFolder = Path.Combine(intermediateFolder, "decompiled", "bin");
+                var outputPath = Path.Combine(outputFolder, this.OutputFile);
+                var decompileBuildPath = Path.Combine(decompileBuildFolder, this.OutputFile);
+
+                // First build.
+                var firstBuildArgs = new List<string>
+                {
+                    "build",
+                    "-o", outputPath,
+                    "-intermediateFolder", intermediateFolder,
+                };
+
+                if (this.ExtensionType != null)
+                {
+                    firstBuildArgs.Add("-ext");
+                    firstBuildArgs.Add(Path.GetFullPath(new Uri(this.ExtensionType.Assembly.CodeBase).LocalPath));
+                }
+
+                firstBuildArgs.AddRange(sourceFiles);
+
+                foreach (var wxlFile in wxlFiles)
+                {
+                    firstBuildArgs.Add("-loc");
+                    firstBuildArgs.Add(wxlFile);
+                }
+
+                foreach (var bindPath in this.BindPaths)
+                {
+                    firstBuildArgs.Add("-bindpath");
+                    firstBuildArgs.Add(bindPath);
+                }
+
+                buildFunc(firstBuildArgs.ToArray());
+
+                // Decompile built output.
+                var decompileArgs = new List<string>
+                {
+                    "msi", "decompile",
+                    outputPath,
+                    "-intermediateFolder", decompileIntermediateFolder,
+                    "-x", decompileExtractFolder,
+                    "-o", decompilePath
+                };
+
+                if (this.ExtensionType != null)
+                {
+                    decompileArgs.Add("-ext");
+                    decompileArgs.Add(Path.GetFullPath(new Uri(this.ExtensionType.Assembly.CodeBase).LocalPath));
+                }
+
+                decompileFunc(decompileArgs.ToArray());
+
+                // Build decompiled output.
+                var secondBuildArgs = new List<string>
+                {
+                    "build",
+                    decompilePath,
+                    "-o", decompileBuildPath,
+                    "-intermediateFolder", decompileIntermediateFolder
+                };
+
+                if (this.ExtensionType != null)
+                {
+                    secondBuildArgs.Add("-ext");
+                    secondBuildArgs.Add(Path.GetFullPath(new Uri(this.ExtensionType.Assembly.CodeBase).LocalPath));
+                }
+
+                secondBuildArgs.Add("-bindpath");
+                secondBuildArgs.Add(outputFolder);
+
+                secondBuildArgs.Add("-bindpath");
+                secondBuildArgs.Add(decompileExtractFolder);
+
+                buildFunc(secondBuildArgs.ToArray());
+            }
+        }
     }
 }