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Simplify unit test logic (#3548)

This commit is contained in:
Aprian Diaz Novandi 2018-01-31 15:58:52 +01:00 committed by Grzegorz Piwowarek
parent a48e062598
commit bd9a87c137
1 changed files with 27 additions and 33 deletions
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60
guava/src/test/java/org/baeldung/guava/GuavaMemoizerUnitTest.java
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@ -38,7 +38,7 @@ public class GuavaMemoizerUnitTest {
int n = 95; int n = 95;
// when // when
BigInteger factorial = new Factorial().getFactorial(n); BigInteger factorial = Factorial.getFactorial(n);
// then // then
BigInteger expectedFactorial = new BigInteger("10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000"); BigInteger expectedFactorial = new BigInteger("10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000");
@ -47,52 +47,46 @@ public class GuavaMemoizerUnitTest {
@Test @Test
public void givenMemoizedSupplier_whenGet_thenSubsequentGetsAreFast() { public void givenMemoizedSupplier_whenGet_thenSubsequentGetsAreFast() {
// given
Supplier<BigInteger> memoizedSupplier; Supplier<BigInteger> memoizedSupplier;
memoizedSupplier = Suppliers.memoize(CostlySupplier::generateBigNumber); memoizedSupplier = Suppliers.memoize(CostlySupplier::generateBigNumber);
Instant start = Instant.now(); // when
BigInteger bigNumber = memoizedSupplier.get(); BigInteger expectedValue = new BigInteger("12345");
Long durationInMs = Duration.between(start, Instant.now()).toMillis(); assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 2000D);
assertThat(bigNumber, is(equalTo(new BigInteger("12345"))));
assertThat(durationInMs.doubleValue(), is(closeTo(2000D, 100D)));
start = Instant.now(); // then
bigNumber = memoizedSupplier.get().add(BigInteger.ONE); assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 0D);
durationInMs = Duration.between(start, Instant.now()).toMillis(); assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 0D);
assertThat(bigNumber, is(equalTo(new BigInteger("12346"))));
assertThat(durationInMs.doubleValue(), is(closeTo(0D, 100D)));
start = Instant.now();
bigNumber = memoizedSupplier.get().add(BigInteger.TEN);
durationInMs = Duration.between(start, Instant.now()).toMillis();
assertThat(bigNumber, is(equalTo(new BigInteger("12355"))));
assertThat(durationInMs.doubleValue(), is(closeTo(0D, 100D)));
} }
@Test @Test
public void givenMemoizedSupplierWithExpiration_whenGet_thenSubsequentGetsBeforeExpiredAreFast() throws InterruptedException { public void givenMemoizedSupplierWithExpiration_whenGet_thenSubsequentGetsBeforeExpiredAreFast() throws InterruptedException {
// given
Supplier<BigInteger> memoizedSupplier; Supplier<BigInteger> memoizedSupplier;
memoizedSupplier = Suppliers.memoizeWithExpiration(CostlySupplier::generateBigNumber, 3, TimeUnit.SECONDS); memoizedSupplier = Suppliers.memoizeWithExpiration(CostlySupplier::generateBigNumber, 3, TimeUnit.SECONDS);
Instant start = Instant.now(); // when
BigInteger bigNumber = memoizedSupplier.get(); BigInteger expectedValue = new BigInteger("12345");
Long durationInMs = Duration.between(start, Instant.now()).toMillis(); assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 2000D);
assertThat(bigNumber, is(equalTo(new BigInteger("12345"))));
assertThat(durationInMs.doubleValue(), is(closeTo(2000D, 100D)));
start = Instant.now();
bigNumber = memoizedSupplier.get().add(BigInteger.ONE);
durationInMs = Duration.between(start, Instant.now()).toMillis();
assertThat(bigNumber, is(equalTo(new BigInteger("12346"))));
assertThat(durationInMs.doubleValue(), is(closeTo(0D, 100D)));
// then
assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 0D);
// add one more second until memoized Supplier is evicted from memory
TimeUnit.SECONDS.sleep(1); TimeUnit.SECONDS.sleep(1);
assertSupplierGetExecutionResultAndDuration(memoizedSupplier, expectedValue, 2000D);
}
start = Instant.now(); private <T> void assertSupplierGetExecutionResultAndDuration(Supplier<T> supplier,
bigNumber = memoizedSupplier.get().add(BigInteger.TEN); T expectedValue,
durationInMs = Duration.between(start, Instant.now()).toMillis(); double expectedDurationInMs) {
assertThat(bigNumber, is(equalTo(new BigInteger("12355")))); Instant start = Instant.now();
assertThat(durationInMs.doubleValue(), is(closeTo(2000D, 100D))); T value = supplier.get();
Long durationInMs = Duration.between(start, Instant.now()).toMillis();
double marginOfErrorInMs = 100D;
assertThat(value, is(equalTo(expectedValue)));
assertThat(durationInMs.doubleValue(), is(closeTo(expectedDurationInMs, marginOfErrorInMs)));
} }
} }