test: Complete testing of calculate Order amount

[iamareebjamal]

No description provided.

[niranjan94]

Here is an overview of what got changed by this pull request:

Issues
======
- Added 1
           

Complexity increasing per file
==============================
- app/api/helpers/order.py  2
         

Clones added
============
- tests/all/integration/api/helpers/order/test_calculate_order_amount.py  3
         

See the complete overview on Codacy

[niranjan94]

Issue found: Function name "test_request_calculate_order_amount_without_discount" doesn't conform to '[a-z_][a-z0-9_]{1,50}$' pattern

[codecov]

Codecov Report

Merging #7007 into development will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development    #7007      +/-   ##
===============================================
+ Coverage        60.56%   60.60%   +0.03%     
===============================================
  Files              259      259              
  Lines            12893    12893              
===============================================
+ Hits              7809     7814       +5     
+ Misses            5084     5079       -5     

Impacted Files	Coverage Δ
app/api/custom/orders.py	19.17% <100.00%> (+0.61%)	⬆️
app/api/helpers/exceptions.py	100.00% <100.00%> (ø)
app/api/helpers/order.py	64.70% <100.00%> (+1.99%)	⬆️
app/instance.py	87.64% <0.00%> (+0.56%)	⬆️

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