CIF-1533 - [React components] The "add to cart" mutation uses a string instead of a float

[dplaton]

Description

Convert the item quantity explicitly to a float before sending the query.

Other trivial things:

• remove an unused debug function from a test
• name the Add to cart mutation to show up nicely in Apollo DevTools

Related Issue

CIF-1533

Motivation and Context

Fix the incompatibility between our React component and the graphql schema.

How Has This Been Tested?

Functional testing

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #351 into master will increase coverage by 0.54%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #351      +/-   ##
============================================
+ Coverage     66.13%   66.67%   +0.54%     
  Complexity      852      852              
============================================
  Files           192      192              
  Lines          5843     5845       +2     
  Branches        912      912              
============================================
+ Hits           3864     3897      +33     
+ Misses         1853     1822      -31     
  Partials        126      126              

Flag	Coverage Δ	Complexity Δ
#integration	66.86% <ø> (ø)	628.00 <ø> (ø)
#jest	45.70% <100.00%> (+1.08%)	0.00 <0.00> (ø)
#karma	93.93% <ø> (ø)	0.00 <ø> (ø)
#unittests	85.81% <ø> (ø)	821.00 <ø> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...omponents/src/queries/mutation_add_to_cart.graphql	61.53% <ø> (+49.03%)	0.00 <0.00> (ø)
...-components/src/components/Minicart/useMinicart.js	96.15% <100.00%> (+0.15%)	0.00 <0.00> (ø)

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