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Factorial Steps

Create Factorial Project
Switch to project window
Create a test class inside the src/test/java - FactorialCalculatorTest
Create a test method
return1IfTheNumberIsLessThan2
new FactorialCalculator(1)
Quick fix - Create a class inside the src/main/java - FactorialCalculator
Quick fix - create a data field for the parameter
Go to test class
Extract variable new FactorialCalculator(1)
new FactorialCalculator.calculate()
Quick fix - create a method inside the class
return type int; return value null;
Extract variable new FactorialCalculator.calculate()
Assertions.assertEquals("0", fc.calculate(0));
Assertions.assertEquals("1", fc.calculate(0));
Run tests
./gradlew test
if(number < 2) return 1;
./gradlew test
create test method shoudlReturn2ItTheNumberIs2()
new FactorialCalculator()

Extreme Programming Xp And Test Driven Development Tdd

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