import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.util.Arrays;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
import static org.assertj.core.api.Assertions.*;
{
@Test
@DisplayName("A new sum can be started, if it does not exist")
- public void testCanStartSumIfNotExists()
+ public void testStartSumPossibleIfNotExists()
{
SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
assertThatNoException().isThrownBy(() -> sumBusinessLogic.startSum("foo"));
@Test
@DisplayName("An empty Optional should be returned, for a non-existing sum")
- public void testEmptyOptionalForNonExistingSum()
+ public void testGetSumReturnsEmptyOptionalForNonExistingSum()
{
SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
assertThat(sumBusinessLogic.getSum("foo")).isEmpty();
@Test
@DisplayName("A non-empty Optional should be returned, for an existing sum")
- public void testNonEmptyOptionalForExistingSum()
+ public void testGetSumReturnsNonEmptyOptionalForExistingSum()
{
SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
sumBusinessLogic.startSum("foo");
@Test
@DisplayName("A sum can be ended, if it does exist")
- public void testCanEndIfSumExists()
+ public void testEndSumPossibleIfSumExists()
{
SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
sumBusinessLogic.startSum("foo");
assertThatNoException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
}
+ @Test
+ @DisplayName("An existing sum is removed, if ended")
+ public void testEndSumRemovesSumIfSumExists()
+ {
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ sumBusinessLogic.startSum("foo");
+ sumBusinessLogic.endSum("foo");
+ assertThat(sumBusinessLogic.getSum("foo")).isEmpty();
+ }
+
@Test
@DisplayName("An existing Sum returns a non-null value, if ended")
public void testEndSumReturnsNonNullValueIfSumExists()
SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.endSum("foo"));
}
+
+ @Test
+ @DisplayName("Adding to a non-existent sum causes an IllegalStateException")
+ public void testAddToSumCausesExceptionIfNotExists()
+ {
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ assertThatIllegalStateException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", 1));
+ }
+
+ @Test
+ @DisplayName("Adding a null-value to an existing sum causes an IllegalArgumentException")
+ public void testAddSumWithNullValueToExistingSumCausesException()
+ {
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ sumBusinessLogic.startSum("foo");
+ assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", null));
+ }
+
+ @ParameterizedTest(name = "{index}: Adding {0}")
+ @DisplayName("Adding a non-positive value to an existing sum causes an IllegalArgumentException")
+ @ValueSource(ints = { 0, -1, -6, -66, Integer.MIN_VALUE })
+ public void testAddSumWithNonPositiveValueToExistingSumCausesException(int value)
+ {
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ sumBusinessLogic.startSum("foo");
+ assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", value));
+ }
+
+ @Test
+ @DisplayName("Can add a positive value to an existing sum")
+ public void testAddSumWithPositiveValuePossibleIfSumExists()
+ {
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ sumBusinessLogic.startSum("foo");
+ assertThatIllegalArgumentException().isThrownBy(() -> sumBusinessLogic.addToSum("foo", -1));
+ }
+
+ @ParameterizedTest(name = "{index}: Summing up {0}")
+ @DisplayName("Adds up numbers correctly")
+ @MethodSource("numbersProvider")
+ public void testAddSumAddsUpNumbersCorrectlyIfSumExists(int... numbers)
+ {
+ long expectedResult = Arrays.stream(numbers).sum();
+ SumBusinessLogic sumBusinessLogic = new SumBusinessLogic();
+ sumBusinessLogic.startSum("foo");
+ Arrays.stream(numbers).forEach(number -> sumBusinessLogic.addToSum("foo", number));
+ assertThat(sumBusinessLogic.endSum("foo")).isEqualTo(expectedResult);
+ }
+
+ static Stream<Arguments> numbersProvider() {
+ return Stream.of(
+ Arguments.of((Object) IntStream.rangeClosed(1,9).toArray()),
+ Arguments.of((Object) IntStream.rangeClosed(1,19).toArray()),
+ Arguments.of((Object) IntStream.rangeClosed(1,66).toArray()));
+ }
}