[Solved] Consider this test snippet using @DataJpaTest: @Test void testCount() { long countBefore = repo.count(); repo.save(new User(null, "Alice")); long countAfter = repo.count(); System.out.... | Spring Boot

Spring Boot - Testing Spring Boot Applications

Consider this test snippet using @DataJpaTest:

@Test
void testCount() {
  long countBefore = repo.count();
  repo.save(new User(null, "Alice"));
  long countAfter = repo.count();
  System.out.println(countAfter - countBefore);
}

What will be printed?

A0

B1

C-1

DCompilation error

Step-by-Step Solution

Solution:

Step 1: Understand repo.count() before and after save
Initially, countBefore is the number of users. After saving one user, countAfter increases by 1.
Step 2: Calculate difference
The difference is 1, so printing countAfter - countBefore outputs 1.
Final Answer:
1 -> Option B
Quick Check:
Count increases by one after save [OK]

Quick Trick: Saving adds one entity, increasing count by 1 [OK]

Common Mistakes:

Assuming count does not change
Confusing countBefore and countAfter
Expecting compilation errors

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More Spring Boot Quizzes

Consider this test snippet using @DataJpaTest:

Step 1: Understand repo.count() before and after save

Step 2: Calculate difference

Final Answer:

Quick Check:

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