Increase code coverage

[nilay-kapadia]

Increase low code coverage of the repository by:

• Adding new test cases
• Removing dead code
• Adding new models to cover additional code

Closes #5

[jarz]

These four files need to be checked-in again with the correct line endings, when I run dotnet test locally they're modified.

• test/Generator.Tests.Generated/Address.cs
• test/Generator.Tests.Generated/AddressTestMap.cs
• test/Generator.Tests.Generated/TestModel.cs
• test/Generator.Tests.Generated/TestModelData.cs

[jarz]

We should also bump this number up: https://github.com/microsoft/dtdl-model-generator/blob/2fc93de6ed017d531945d5231f9eca5027481853/.github/workflows/build.yml#LL21C6-L21C28

[jarz]

I had to use WSL to figure out the problem:

"Could not find a part of the path '/home/tim/dtdl-model-generator/test/Generator.Tests/bin/Debug/net6/TestDtdlErrorModels\\TestDtdlErrorUnsupportedContentType'."

Since Linux uses / (and the Build action runs on Linux) we just had to adjust the directory separator. Luckily, Windows can also treat / as a directory separator too.

[jarz]

One final thing: can this line be updated to add CS0612 to the list? That will stop the obsolete warnings that are noise.