Summary - Advanced testing

Combine integration, property and coverage to write a test suite.

Summary - Advanced testing

This group covered advanced testing: integration tests (component flow), property tests (random invariants), mock (fake dependencies), coverage (scope measurement), golden tests (golden file comparison).

Core: integration tests reality, property tests invariants, mock tests dependencies. Coverage shows how much code is exercised. Golden catches output changes.

These techniques are used together: integration tests isolated with mocks, invariants with property tests, measurement with coverage, visual/text output checks with golden.

Exercise Summary: calc + expect + loop

Define a Calculator class with int add(int a, int b) => a + b;. Define a global int testCount = 0; variable. Define a void expect(dynamic actual, dynamic expected, String label) function with testCount++; if (actual != expected) print('FAIL: $label');. In main create final calc = Calculator();; run 10 tests with for (var i = 0; i < 10; i++) { expect(calc.add(i, 0), i, 'identity $i'); }; finally add print('PASS: $testCount tests');.

Show example solution

int testCount = 0;

class Calculator {
  int add(int a, int b) => a + b;
}

void expect(dynamic actual, dynamic expected, String label) {
  testCount++;
  if (actual != expected) print('FAIL: $label');
}

void main() {
  final calc = Calculator();
  for (var i = 0; i < 10; i++) {
    expect(calc.add(i, 0), i, 'identity $i');
  }
  print('PASS: $testCount tests');
}

Test yourself

Which test checks invariants on random inputs?
- Integration test
- Golden test
- Property test
- Coverage report
Show answer

Property test — a property test checks invariants on random inputs.
Match the test types

Integration

Components
Property

Invariants
Mock

Fake
Golden

Reference
The expect call
```
  ____(result, 5);
```
Show answer
```
  expect(result, 5);
```

Next lesson: Project design

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