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How should you write a test for a Django model method that calculates the total price by multiplying quantity and unit price fields?

hard📝 Conceptual Q9 of 15
Django - Testing Django Applications
How should you write a test for a Django model method that calculates the total price by multiplying quantity and unit price fields?
AMock the model method and check if it is called
BCreate an instance with known quantity and unit price, then assert the method returns their product
CTest only the database save without calling the method
DUse a form to validate the total price field
Step-by-Step Solution
Solution:

  1. Step 1: Understand the method's purpose

    The method computes total price = quantity * unit price.

  2. Step 2: Write test logic

    Create a model instance with fixed quantity and unit price, then assert the method returns the correct product.

  3. Final Answer:

    Create an instance with known quantity and unit price, then assert the method returns their product correctly tests the computed property by asserting expected output.

  4. Quick Check:

    Test computed output with known inputs [OK]
Quick Trick: Test computed methods with fixed inputs [OK]
Common Mistakes:
MISTAKES
  • Mocking instead of testing actual output
  • Ignoring method return value
  • Testing unrelated model aspects

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