spec: ensure 100% coverage

[q9f]

No description provided.

[codecov-commenter]

Codecov Report

Merging #56 (9e7acbb) into master (fea580b) will increase coverage by 0.72%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   99.13%   99.85%   +0.72%     
==========================================
  Files          13       14       +1     
  Lines        1387     1413      +26     
==========================================
+ Hits         1375     1411      +36     
+ Misses         12        2      -10     

Impacted Files	Coverage Δ
lib/money-tree/node.rb	99.45% <ø> (+3.64%)	⬆️
lib/money-tree.rb	100.00% <100.00%> (ø)
lib/money-tree/address.rb	100.00% <100.00%> (+18.75%)	⬆️
lib/money-tree/support.rb	100.00% <100.00%> (ø)
spec/money-tree/money_tree_spec.rb	100.00% <100.00%> (ø)
spec/money-tree/node_spec.rb	100.00% <100.00%> (ø)

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