Java/src/test/java/com/thealgorithms/maths/AverageTest.java at master · TheAlgorithms/Java · GitHub

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packagecom.thealgorithms.maths;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertThrows;

importjava.util.stream.Stream;
importorg.junit.jupiter.api.Test;
importorg.junit.jupiter.params.ParameterizedTest;
importorg.junit.jupiter.params.provider.Arguments;
importorg.junit.jupiter.params.provider.MethodSource;

publicclassAverageTest {

privatestaticfinaldoubleSMALL_VALUE = 0.00001d;

@ParameterizedTest(name = "average({0}) should be approximately {1}")
@MethodSource("provideDoubleArrays")
voidtestAverageDouble(double[] numbers, doubleexpected) {
assertEquals(expected, Average.average(numbers), SMALL_VALUE);
 }

@ParameterizedTest(name = "average({0}) should be {1}")
@MethodSource("provideIntArrays")
voidtestAverageInt(int[] numbers, longexpected) {
assertEquals(expected, Average.average(numbers));
 }

@Test
voidtestAverageDoubleThrowsExceptionOnNullOrEmpty() {
assertThrows(IllegalArgumentException.class, () -> Average.average((double[]) null));
assertThrows(IllegalArgumentException.class, () -> Average.average(newdouble[0]));
 }

@Test
voidtestAverageIntThrowsExceptionOnNullOrEmpty() {
assertThrows(IllegalArgumentException.class, () -> Average.average((int[]) null));
assertThrows(IllegalArgumentException.class, () -> Average.average(newint[0]));
 }

privatestaticStream<Arguments> provideDoubleArrays() {
returnStream.of(Arguments.of(newdouble[] {3d, 6d, 9d, 12d, 15d, 18d, 21d}, 12d), Arguments.of(newdouble[] {5d, 10d, 15d, 20d, 25d, 30d, 35d}, 20d), Arguments.of(newdouble[] {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d}, 4.5d), Arguments.of(newdouble[] {0d, 0d, 0d}, 0d),
Arguments.of(newdouble[] {-1d, -2d, -3d}, -2d), Arguments.of(newdouble[] {1e-10, 1e-10, 1e-10}, 1e-10));
 }

privatestaticStream<Arguments> provideIntArrays() {
returnStream.of(Arguments.of(newint[] {2, 4, 10}, 5L), Arguments.of(newint[] {0, 0, 0}, 0L), Arguments.of(newint[] {-1, -2, -3}, -2L), Arguments.of(newint[] {1, 1, 1, 1, 1}, 1L));
 }
}