Re-enable tests for hidden extensions on all targets

[atifaziz]

This PR re-enables tests for extensions hidden in PR #945. This not only helps recover the coverage (from 90.7% to 93.3%), requires less maintenance of conditionally compiled code, but also exercises those extensions that are still accessible via MoreLinq.Extensions.*Extension wrappers.

Coverage before:

Summary
  Parser: MultiReport (4x OpenCover)
  Assemblies: 1
  Classes: 20
  Files: 113
  Line coverage: 90.7%
  Covered lines: 3104
  Uncovered lines: 318
  Coverable lines: 3422
  Total lines: 15386
  Branch coverage: 87.4% (2097 of 2399)
  Covered branches: 2097
  Total branches: 2399
  Method coverage: 91.6% (482 of 526)
  Covered methods: 482
  Total methods: 526

MoreLinq                                    90.7%
  Delegating.Delegate                      100.0%
  Delegating.DelegatingDisposable           87.5%
  Delegating.DelegatingObserver<T>          90.9%
  MoreLinq.Assume                          100.0%
  MoreLinq.CollectionLike                   85.7%
  MoreLinq.CollectionLike<T>               100.0%
  MoreLinq.Collections.Dictionary<T1, T2>  100.0%
  MoreLinq.Debug                           100.0%
  MoreLinq.Disposable                        0.0%
  MoreLinq.EmptyArray<T>                   100.0%
  MoreLinq.Grouping<T1, T2>                 59.4%
  MoreLinq.ListLike                         88.8%
  MoreLinq.ListLike<T>                     100.0%
  MoreLinq.Lookup<T1, T2>                   58.8%
  MoreLinq.MoreEnumerable                   94.2%
  MoreLinq.PendNode<T>                       0.0%
  MoreLinq.Reactive.Observable             100.0%
  MoreLinq.Reactive.Subject<T>              81.5%
  MoreLinq.ReverseComparer<T>              100.0%
  MoreLinq.SequenceException                50.0%

Coverage after:

Summary
  Parser: MultiReport (4x OpenCover)
  Assemblies: 1
  Classes: 20
  Files: 113
  Line coverage: 93.3%
  Covered lines: 3196
  Uncovered lines: 226
  Coverable lines: 3422
  Total lines: 15386
  Branch coverage: 90% (2161 of 2399)
  Covered branches: 2161
  Total branches: 2399
  Method coverage: 94.1% (495 of 526)
  Covered methods: 495
  Total methods: 526

MoreLinq                                    93.3%
  Delegating.Delegate                      100.0%
  Delegating.DelegatingDisposable           87.5%
  Delegating.DelegatingObserver<T>          90.9%
  MoreLinq.Assume                          100.0%
  MoreLinq.CollectionLike                   85.7%
  MoreLinq.CollectionLike<T>               100.0%
  MoreLinq.Collections.Dictionary<T1, T2>  100.0%
  MoreLinq.Debug                           100.0%
  MoreLinq.Disposable                        0.0%
  MoreLinq.EmptyArray<T>                   100.0%
  MoreLinq.Grouping<T1, T2>                 59.4%
  MoreLinq.ListLike                         88.8%
  MoreLinq.ListLike<T>                     100.0%
  MoreLinq.Lookup<T1, T2>                   58.8%
  MoreLinq.MoreEnumerable                   95.1%
  MoreLinq.PendNode<T>                      98.4%
  MoreLinq.Reactive.Observable             100.0%
  MoreLinq.Reactive.Subject<T>              81.5%
  MoreLinq.ReverseComparer<T>              100.0%
  MoreLinq.SequenceException                50.0%

Coverage delta:

diff --git a/before.txt b/after.txt
index d3e601c2..61df92fd 100644
--- a/before.txt
+++ b/after.txt
@@ -3,19 +3,19 @@ Summary
   Assemblies: 1
   Classes: 20
   Files: 113
-  Line coverage: 90.7%
-  Covered lines: 3104
-  Uncovered lines: 318
+  Line coverage: 93.3%
+  Covered lines: 3196
+  Uncovered lines: 226
   Coverable lines: 3422
   Total lines: 15386
-  Branch coverage: 87.4% (2097 of 2399)
-  Covered branches: 2097
+  Branch coverage: 90% (2161 of 2399)
+  Covered branches: 2161
   Total branches: 2399
-  Method coverage: 91.6% (482 of 526)
-  Covered methods: 482
+  Method coverage: 94.1% (495 of 526)
+  Covered methods: 495
   Total methods: 526
 
-MoreLinq                                    90.7%
+MoreLinq                                    93.3%
   Delegating.Delegate                      100.0%
   Delegating.DelegatingDisposable           87.5%
   Delegating.DelegatingObserver<T>          90.9%
@@ -30,8 +30,8 @@ MoreLinq                                    90.7%
   MoreLinq.ListLike                         88.8%
   MoreLinq.ListLike<T>                     100.0%
   MoreLinq.Lookup<T1, T2>                   58.8%
-  MoreLinq.MoreEnumerable                   94.2%
-  MoreLinq.PendNode<T>                       0.0%
+  MoreLinq.MoreEnumerable                   95.1%
+  MoreLinq.PendNode<T>                      98.4%
   MoreLinq.Reactive.Observable             100.0%
   MoreLinq.Reactive.Subject<T>              81.5%
   MoreLinq.ReverseComparer<T>              100.0%

[codecov]

Codecov Report

Merging #1009 (c5fca69) into master (d739f65) will increase coverage by 2.07%.
The diff coverage is n/a.

❗ Current head c5fca69 differs from pull request most recent head e98d632. Consider uploading reports for the commit e98d632 to get more accurate results

@@            Coverage Diff             @@
##           master    #1009      +/-   ##
==========================================
+ Coverage   90.50%   92.57%   +2.07%     
==========================================
  Files         113      113              
  Lines        3422     3422              
  Branches     1055     1055              
==========================================
+ Hits         3097     3168      +71     
+ Misses        263      191      -72     
- Partials       62       63       +1     

see 6 files with indirect coverage changes

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