Add Blazor SWA Baseline Mismatched Assets Logging

[TanayParikh]

Fixes: dotnet/aspnetcore#43834

[danmoseley]

Seems fine, but would it be more likely to avoid rot if it was pasted into AspNetSdkBaselineTest.cs and instructions directed there instead?

[javiercn]

I think we need to make sure we are getting the desired outcome before moving forward with the changes.

We should also just put a link to the wiki with the appropriate instructions (there is a script to deal with it now in one go)

[TanayParikh]

Also added some more instructions to make this more actionable: e585f49

[TanayParikh]

There isn't a great way to have super customized error message with fluent assertions, but after playing around with it a bit, I'm getting the following.

Same number of manifest assets, `AssetTraitValue` property differs on one asset:

    Expected differences to be empty because the generated manifest should match the expected baseline.

If the difference in baselines is expected, please re-generate the baselines.
Note, baseline generation must be done on a Windows device.
Start by ensuring you're dogfooding the SDK from the current branch (dotnet --version should be '*.0.0-dev').
    If you're not on the dogfood sdk, from the root of the repository run:
        1. dotnet clean
        2. .\restore.cmd
        3. .\build.cmd
        4. .\eng\dogfood.cmd

Then, using the dogfood SDK run the .\src\RazorSdk\update-test-baselines.ps1 script.

, but found {"
==================================================

For C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\PackageLibraryDirectDependency.bundle.scp.css:

Expected manifest AssetTraitValue of ProjectBundle but found {{Some fake trait value}}.

=================================================="}.

Same number of manifest assets, `AssetTraitValue` property differs on **all** assets:

Expected differences to be empty because the generated manifest should match the expected baseline.

If the difference in baselines is expected, please re-generate the baselines.
Note, baseline generation must be done on a Windows device.
Start by ensuring you're dogfooding the SDK from the current branch (dotnet --version should be '*.0.0-dev').
    If you're not on the dogfood sdk, from the root of the repository run:
        1. dotnet clean
        2. .\restore.cmd
        3. .\build.cmd
        4. .\eng\dogfood.cmd

Then, using the dogfood SDK run the .\src\RazorSdk\update-test-baselines.ps1 script.

, but found {"
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\AnotherClassLib\wwwroot\AnotherClassLib.lib.module.build.js:

Expected manifest AssetTraitValue of JSLibraryModule but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\AnotherClassLib\wwwroot\css\site.css:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\AnotherClassLib\wwwroot\js\project-direct-dep.js:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\AppWithPackageAndP2PReference\obj\Debug\net7.0\jsmodules\jsmodules.build.manifest.json:

Expected manifest AssetTraitValue of JSModuleManifest but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\AppWithPackageAndP2PReference\obj\Debug\net7.0\scopedcss\bundle\AppWithPackageAndP2PReference.styles.css:

Expected manifest AssetTraitValue of ApplicationBundle but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\ClassLibrary\obj\Debug\net7.0\scopedcss\projectbundle\ClassLibrary.bundle.scp.css:

Expected manifest AssetTraitValue of ProjectBundle but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\ClassLibrary\wwwroot\js\project-transitive-dep.js:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\tmp\Debug\PublishProjec---84E11935\ClassLibrary\wwwroot\js\project-transitive-dep.v4.js:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\css\site.css:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\js\pkg-direct-dep.js:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\PackageLibraryDirectDependency.bundle.scp.css:

Expected manifest AssetTraitValue of ProjectBundle but found {{Some fake trait value}}.

==================================================", "
==================================================

For C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarytransitivedependency\[[CustomPackageVersion]]\staticwebassets\js\pkg-transitive-dep.js:

Expected manifest AssetTraitValue of  but found {{Some fake trait value}}.

=================================================="}.

Different number of manifest assets:

(just did a skip 2)

    System.Exception : The following expected assets weren't found in the manifest:
	C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\css\site.css
	C:\Users\taparik\dev\sdk\artifacts\.nuget\packages\packagelibrarydirectdependency\[[CustomPackageVersion]]\staticwebassets\js\pkg-direct-dep.js

If the difference in baselines is expected, please re-generate the baselines.
Note, baseline generation must be done on a Windows device.
Start by ensuring you're dogfooding the SDK from the current branch (dotnet --version should be '*.0.0-dev').
    If you're not on the dogfood sdk, from the root of the repository run:
        1. dotnet clean
        2. .\restore.cmd
        3. .\build.cmd
        4. .\eng\dogfood.cmd

Then, using the dogfood SDK run the .\src\RazorSdk\update-test-baselines.ps1 script.