Add test to verify patches without files work

Resolves wixtoolset/issues#4912

4 files changed, 74 insertions, 0 deletions

diff --git a/src/test/WixToolsetTest.CoreIntegration/PatchFixture.cs b/src/test/WixToolsetTest.CoreIntegration/PatchFixture.cs
index dda4ca28..788cc01f 100644
--- a/src/test/WixToolsetTest.CoreIntegration/PatchFixture.cs
+++ b/src/test/WixToolsetTest.CoreIntegration/PatchFixture.cs
@@ -53,6 +53,38 @@ namespace WixToolsetTest.CoreIntegration
         }
 
         [Fact]
+        public void CanBuildSimplePatchWithNoFileChanges()
+        {
+            var folder = TestData.Get(@"TestData\PatchNoFileChanges");
+
+            using (var fs = new DisposableFileSystem())
+            {
+                var tempFolder = fs.GetFolder();
+
+                var baselinePdb = BuildMsi("Baseline.msi", folder, tempFolder, "1.0.0", "1.0.0", "1.0.0");
+                var update1Pdb = BuildMsi("Update.msi", folder, tempFolder, "1.0.1", "1.0.1", "1.0.1");
+                var patchPdb = BuildMsp("Patch1.msp", folder, tempFolder, "1.0.1", hasNoFiles: true);
+                var patchPath = Path.ChangeExtension(patchPdb, ".msp");
+
+                Assert.True(File.Exists(baselinePdb));
+                Assert.True(File.Exists(update1Pdb));
+
+                var doc = GetExtractPatchXml(patchPath);
+                Assert.Equal("{7D326855-E790-4A94-8611-5351F8321FCA}", doc.Root.Element(PatchNamespace + "TargetProductCode").Value);
+
+                var names = Query.GetSubStorageNames(patchPath);
+                Assert.Equal(new[] { "#RTM.1", "RTM.1" }, names);
+
+                var cab = Path.Combine(tempFolder, "foo.cab");
+                Query.ExtractStream(patchPath, "foo.cab", cab);
+                Assert.True(File.Exists(cab));
+
+                var files = Query.GetCabinetFiles(cab);
+                Assert.Empty(files);
+            }
+        }
+
+        [Fact]
         public void CanBuildBundleWithNonSpecificPatches()
         {
             var folder = TestData.Get(@"TestData\PatchNonSpecific");
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/.data/A.txt b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/.data/A.txt
new file mode 100644
index 00000000..6fd385bd
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/.data/A.txt
@@ -0,0 +1 @@
+This is A v1.0.0
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Package.wxs b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Package.wxs
new file mode 100644
index 00000000..9d530376
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Package.wxs
@@ -0,0 +1,25 @@
+<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
+  <Package Name="~Test Package" Version="$(V)" Manufacturer="Example Corporation" Language="1033" UpgradeCode="7d326855-e790-4a94-8611-5351f8321fca" Compressed="yes" Scope="perMachine" ProductCode="7d326855-e790-4a94-8611-5351f8321fca">
+
+    <MajorUpgrade DowngradeErrorMessage="Newer version already installed." />
+    <MediaTemplate EmbedCab="yes" />
+
+    <Directory Id="INSTALLFOLDER" Name="ProgramFilesFolder:\~Test App" />
+
+    <Feature Id="Main">
+      <ComponentGroupRef Id="Components" />
+    </Feature>
+  </Package>
+
+  <Fragment>
+    <ComponentGroup Id="Components" Directory="INSTALLFOLDER">
+      <Component>
+        <File Id="a.txt" Name="a.txt" Source="A.txt" />
+      </Component>
+
+      <Component>
+        <RegistryValue Root="HKLM" Key="SOFTWARE\!(bind.property.ProductName)\Patch" Name="Version" Value="$(V)" />
+      </Component>
+    </ComponentGroup>
+  </Fragment>
+</Wix>
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Patch.wxs b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Patch.wxs
new file mode 100644
index 00000000..889b1220
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/PatchNoFileChanges/Patch.wxs
@@ -0,0 +1,16 @@
+<Wix xmlns='http://wixtoolset.org/schemas/v4/wxs'>
+  <Patch
+    AllowRemoval="yes"
+    DisplayName="~Test Patch v$(V)"
+    Description="~Test Small Update Patch v$(V)"
+    MoreInfoURL="http://www.example.com/"
+    Manufacturer="Example Corporation"
+    Classification="Update">
+
+    <Media Id="1" Cabinet="foo.cab">
+      <PatchBaseline Id="RTM" BaselineFile="Baseline.wixpdb" UpdateFile="Update.wixpdb" />
+    </Media>
+
+    <PatchFamily Id='SequenceFamily' Version='$(V)' />
+  </Patch>
+</Wix>