[tests/MSBuildDeviceIntegration] Add test for dll's which have the same size.

Context xamarin/monodroid#1123

There seems to be a bug in the new fast deployment system
where if the dll was modified BUT had exactly the same size
as the existing dll on the device it would not be uploade.

This commit adds a test to make sure this does work as
expected.

Author: dellis1972

tests/MSBuildDeviceIntegration/Tests/InstallTests.cs

@@ -478,14 +478,15 @@ public void IncrementalFastDeployment ()
 				}
 			};
 
+			var class2src = new BuildItem.Source ("Class2.cs") {
+				TextContent = () => "namespace Library2 { public class Class2 { public static int foo = 0; } }"
+			};
 			var lib2 = new DotNetStandard {
 				ProjectName = "Library2",
 				Sdk = "Microsoft.NET.Sdk",
 				TargetFramework = "netstandard2.0",
 				Sources = {
-					new BuildItem.Source ("Class2.cs") {
-						TextContent = () => "namespace Library2 { public class Class2 { } }"
-					},
+					class2src,
 				}
 			};
 
@@ -507,21 +508,29 @@ public void IncrementalFastDeployment ()
 			using (var builder = CreateApkBuilder (Path.Combine (rootPath, app.ProjectName))) {
 				builder.ThrowOnBuildFailure = false;
 				Assert.IsTrue (builder.Install (app), "First install should have succeeded.");
+				var logLines = builder.LastBuildOutput;
+				Assert.IsTrue (logLines.Any (l => l.Contains ("NotifySync CopyFile") && l.Contains ("Library2.dll")), "Library2.dll should have been uploaded");
 				var firstInstallTime = builder.LastBuildTime;
 				Assert.IsTrue (builder.Install (app, doNotCleanupOnUpdate: true, saveProject: false), "Second install should have succeeded.");
 				var secondInstallTime = builder.LastBuildTime;
 
 				var filesToTouch = new [] {
 					Path.Combine (rootPath, lib1.ProjectName, "Class1.cs"),
-					Path.Combine (rootPath, lib2.ProjectName, "Class2.cs"),
 					Path.Combine (rootPath, app.ProjectName, "MainPage.xaml"),
 				};
 				foreach (var file in filesToTouch) {
 					FileAssert.Exists (file);
 					File.SetLastWriteTimeUtc (file, DateTime.UtcNow);
 				}
 
+				class2src.TextContent = () => "namespace Library2 { public class Class2 { public static int foo = 100; } }";
+				using (var lb2 = CreateDllBuilder (Path.Combine (rootPath, lib2.ProjectName)))
+					Assert.IsTrue (lb2.Build (lib2), "Second library build should have succeeded.");
+
 				Assert.IsTrue (builder.Install (app, doNotCleanupOnUpdate: true, saveProject: false), "Third install should have succeeded.");
+				Assert.IsTrue (logLines.Any (l => l.Contains ("NotifySync CopyFile") && l.Contains ("UnnamedProject.dll")), "UnnamedProject.dll should have been uploaded");
+				Assert.IsTrue (logLines.Any (l => l.Contains ("NotifySync CopyFile") && l.Contains ("Library2.dll")), "Library2.dll should have been uploaded");
+				Assert.IsTrue (logLines.Any (l => l.Contains ("NotifySync SkipCopyFile") && l.Contains ("Library1.dll")), "Library1.dll should not have been uploaded");
 				var thirdInstallTime = builder.LastBuildTime;
 				Assert.IsTrue (builder.Install (app, doNotCleanupOnUpdate: true, saveProject: false), "Fourth install should have succeeded.");
 				var fourthInstalTime = builder.LastBuildTime;