Skip System.Text.Json tests on iOS/tvOS that don't work

[akoeplinger]

A number of tests using dynamic can't work on iOS devices due to "dynamic invoke" (where Mono does an indirect runtime invoke using a single universal invoke wrapper) not being supported, added PlatformDetection checks for System.Reflection.Emit since that is a close enough approximation for those.

A few other tests run into an "Attempting to JIT compile method" issue that is tracked by #58204

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Issue Details

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A number of tests using dynamic can't work on iOS devices due to System.Reflection.Emit not being supported, added PlatformDetection checks for those.

A few other tests run into an "Attempting to JIT compile method" issue that is tracked by #58204

Author:	akoeplinger
Assignees:	-
Labels:	area-System.Text.Json
Milestone:	-

[danmoseley]

does this mean there are missing [UnsupportedOSPlatform..] attributes?

[akoeplinger]

I don't know an easy way to attach UnsupportedOSPlatform in this case since there are a couple special cases e.g. it works in the iOS Simulator since we can JIT there, or if we enable the Mono interpreter on iOS like we did for Browser.

[lambdageek]

A number of tests using dynamic can't work on iOS devices due to System.Reflection.Emit not being supported, added PlatformDetection checks for those.

nit: I was wrong. They're not using dynamic (from C#). They're using "dynamic invoke" (where Mono does an indirect runtime invoke using a single universal invoke wrapper)

nit2: wrong again. They really do use dynamic. (And also they happen to fall into the dynamic invoke code in the runtime.)

[steveharter]

LGTM although please change the ConvertJSONArrayToIListOfJsonNode test to not use dynamic and remove the [ConditionalFact] from the test.