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Add SecondMinMax (#4432)

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* Added Second Min/Max program

* Clang-format-lint error resolved

* Clang-format-error 2

* Added Program to find Second Minimum/Maximum element

* Test File & few changes

* Clang-lint-error resolved

* Maven Build Error Resolved

* Clang-lint-error resolved

* Clang-lint-error resolved 2

* Changes Resolved

* Test Arguements are Streamed

* Clang-lint-error resolved

* incresed code reusability

* Added Program to find Second Min / Max

* Program to find Second Min / Max

* Program to find Second Minimum / Maximum

* Program to find Second Best Number

* style: mark `initialVal` as `final`

* style: resolve `MultipleVariableDeclarations`

Each variable declaration must be in its own statement.

---------

Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com>
This commit is contained in:
Bharath Sanjeevi T
2023-10-01 20:58:37 +05:30
committed by GitHub
parent da687c11cb
commit 37b3844b98
2 changed files with 118 additions and 0 deletions
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src/test/java/com/thealgorithms/maths/SecondMinMaxTest.java Normal file
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package com.thealgorithms.maths;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import java.util.stream.Stream;
import org.junit.jupiter.api.Assertions;
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;
public class SecondMinMaxTest {
private static final String EXP_MSG_ARR_LEN_LESS_2 = "Input array must have length of at least two";
private static final String EXP_MSG_ARR_SAME_ELE = "Input array should have at least 2 distinct elements";
public static class TestCase {
public TestCase(final int[] inInputArray, final int inSecondMin, final int inSecondMax) {
inputArray = inInputArray;
secondMin = inSecondMin;
secondMax = inSecondMax;
}
final int[] inputArray;
final int secondMin;
final int secondMax;
}
@Test
public void testForEmptyInputArray() {
IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> SecondMinMax.findSecondMin(new int[] {}));
assertEquals(exception.getMessage(), EXP_MSG_ARR_LEN_LESS_2);
}
@Test
public void testForArrayWithSingleElement() {
IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> SecondMinMax.findSecondMax(new int[] {1}));
assertEquals(exception.getMessage(), EXP_MSG_ARR_LEN_LESS_2);
}
@Test
public void testForArrayWithSameElements() {
IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> SecondMinMax.findSecondMin(new int[] {1, 1, 1, 1}));
assertEquals(exception.getMessage(), EXP_MSG_ARR_SAME_ELE);
}
@ParameterizedTest
@MethodSource("inputStream")
void numberTests(final TestCase tc) {
Assertions.assertEquals(tc.secondMax, SecondMinMax.findSecondMax(tc.inputArray));
Assertions.assertEquals(tc.secondMin, SecondMinMax.findSecondMin(tc.inputArray));
}
private static Stream<Arguments> inputStream() {
return Stream.of(Arguments.of(new TestCase(new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, 2, 9)), Arguments.of(new TestCase(new int[] {5, 4, 5, 5, 5}, 5, 4)), Arguments.of(new TestCase(new int[] {-1, 0}, 0, -1)),
Arguments.of(new TestCase(new int[] {-10, -9, -8, -7, -6, -5, -4, -3, -2, -1}, -9, -2)), Arguments.of(new TestCase(new int[] {3, -2, 3, 9, -4, -4, 8}, -2, 8)));
}
}