Fix test

[54k1]

This Pull Request fixes the compilation error in exec/tests. Also, sorry about the Rustfmt check failing .. I'll make sure not to do that again.

[codecov]

Codecov Report

Merging #650 into master will increase coverage by 1.24%.
The diff coverage is 77.48%.

@@            Coverage Diff             @@
##           master     #650      +/-   ##
==========================================
+ Coverage   71.25%   72.50%   +1.24%     
==========================================
  Files         176      179       +3     
  Lines       11557    13376    +1819     
==========================================
+ Hits         8235     9698    +1463     
- Misses       3322     3678     +356     

Impacted Files	Coverage Δ
boa/src/builtins/mod.rs	22.58% <0.00%> (-0.76%)	⬇️
boa/src/environment/function_environment_record.rs	27.08% <ø> (ø)
boa/src/environment/global_environment_record.rs	27.95% <0.00%> (ø)
boa/src/syntax/ast/op.rs	9.19% <0.00%> (-0.11%)	⬇️
boa/src/syntax/ast/punctuator.rs	2.10% <0.00%> (-0.03%)	⬇️
boa_cli/src/helper.rs	0.00% <0.00%> (ø)
boa_cli/src/main.rs	33.33% <ø> (+27.45%)	⬆️
boa_wasm/src/lib.rs	0.00% <0.00%> (ø)
boa/src/builtins/error/mod.rs	32.00% <12.50%> (-4.37%)	⬇️
boa/src/builtins/object/iter.rs	14.14% <14.14%> (ø)
... and 94 more

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[Razican]

This seems to be a duplicate of #646