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

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packagecom.thealgorithms.maths;

importorg.junit.jupiter.api.Assertions;
importorg.junit.jupiter.api.Test;

/**
 * Test cases for {@link HeronsFormula}.
 */
classHeronsFormulaTest {

privatestaticfinaldoubleEPSILON = 1e-10;

@Test
voidtestRightTriangleThreeFourFive() {
Assertions.assertEquals(6.0, HeronsFormula.herons(3, 4, 5), EPSILON);
 }

@Test
voidtestTriangleTwentyFourThirtyEighteen() {
Assertions.assertEquals(216.0, HeronsFormula.herons(24, 30, 18), EPSILON);
 }

@Test
voidtestEquilateralTriangle() {
Assertions.assertEquals(0.4330127018922193, HeronsFormula.herons(1, 1, 1), EPSILON);
 }

@Test
voidtestScaleneTriangleFourFiveEight() {
Assertions.assertEquals(8.181534085976786, HeronsFormula.herons(4, 5, 8), EPSILON);
 }

@Test
voidtestEquilateralTriangleLargeSides() {
finaldoubleside = 10.0;
finaldoubleexpectedArea = Math.sqrt(3) / 4 * side * side;
Assertions.assertEquals(expectedArea, HeronsFormula.herons(side, side, side), EPSILON);
 }

@Test
voidtestIsoscelesTriangle() {
Assertions.assertEquals(12.0, HeronsFormula.herons(5, 5, 6), EPSILON);
 }

@Test
voidtestSmallTriangle() {
Assertions.assertEquals(0.4330127018922193, HeronsFormula.herons(1.0, 1.0, 1.0), EPSILON);
 }

@Test
voidtestLargeTriangle() {
Assertions.assertEquals(600.0, HeronsFormula.herons(30, 40, 50), EPSILON);
 }

@Test
voidtestDecimalSides() {
finaldoublearea = HeronsFormula.herons(2.5, 3.5, 4.0);
Assertions.assertTrue(area > 0);
Assertions.assertEquals(4.330127018922194, area, EPSILON);
 }

@Test
voidtestDegenerateTriangleEqualToSumOfOtherTwo() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(1, 2, 3); });
 }

@Test
voidtestDegenerateTriangleVariant2() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(2, 1, 3); });
 }

@Test
voidtestDegenerateTriangleVariant3() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(3, 2, 1); });
 }

@Test
voidtestDegenerateTriangleVariant4() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(1, 3, 2); });
 }

@Test
voidtestInvalidTriangleSideGreaterThanSum() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(1, 1, 5); });
 }

@Test
voidtestZeroFirstSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(0, 1, 1); });
 }

@Test
voidtestZeroSecondSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(1, 0, 1); });
 }

@Test
voidtestZeroThirdSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(1, 1, 0); });
 }

@Test
voidtestNegativeFirstSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(-1, 2, 2); });
 }

@Test
voidtestNegativeSecondSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(2, -1, 2); });
 }

@Test
voidtestNegativeThirdSide() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(2, 2, -1); });
 }

@Test
voidtestAllNegativeSides() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(-1, -2, -3); });
 }

@Test
voidtestAllZeroSides() {
Assertions.assertThrows(IllegalArgumentException.class, () -> { HeronsFormula.herons(0, 0, 0); });
 }

@Test
voidtestVerySmallTriangle() {
finaldoubleresult = HeronsFormula.herons(0.001, 0.001, 0.001);
Assertions.assertTrue(result > 0);
Assertions.assertTrue(result < 0.001);
 }

@Test
voidtestRightTriangleFiveTwelveThirteen() {
Assertions.assertEquals(30.0, HeronsFormula.herons(5, 12, 13), EPSILON);
 }

@Test
voidtestRightTriangleEightFifteenSeventeen() {
Assertions.assertEquals(60.0, HeronsFormula.herons(8, 15, 17), EPSILON);
 }
}