Add missing unittests to raise coverage above 90% again

[Rick-van-Dam]

No description provided.

[codecov]

Codecov Report

Merging #12 into develop will increase coverage by 14.41%.
The diff coverage is 69.56%.

@@             Coverage Diff             @@
##           develop     #12       +/-   ##
===========================================
+ Coverage    82.69%   97.1%   +14.41%     
===========================================
  Files           30      32        +2     
  Lines          624     657       +33     
  Branches        55      56        +1     
===========================================
+ Hits           516     638      +122     
+ Misses         106      18       -88     
+ Partials         2       1        -1

Impacted Files	Coverage Δ
Singularity/Extensions/EnumerableExtensions.cs	100% <ø> (ø)	⬆️
...gularity/Bindings/StronglyTypedDecoratorBinding.cs	100% <ø> (ø)	⬆️
Singularity/Graph/DecoratorExpressionGenerator.cs	100% <ø> (ø)	⬆️
Singularity/Graph/Graph.cs	100% <ø> (ø)	⬆️
Singularity/Graph/DependencyGraph.cs	100% <ø> (ø)	⬆️
Singularity/Extensions/ExpressionExtensions.cs	100% <ø> (+33.33%)	⬆️
Singularity/Graph/UnresolvedDependency.cs	100% <ø> (ø)	⬆️
.../Source/Code/Singularity.Duality/Scopes/ILogger.cs	0% <0%> (ø)
...de/Singularity.Duality/Scopes/SceneScopeFactory.cs	0% <0%> (ø)
...urce/Code/Singularity.Duality/SingularityPlugin.cs	0% <0%> (ø)	⬆️
... and 14 more

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