Java/src/test/java/com/thealgorithms/maths/MeansTest.java at master · YanYan-Rf/Java · GitHub

History

269 lines (224 loc) · 9.3 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

package com.thealgorithms.maths;

import static org.junit.jupiter.api.Assertions.assertEquals;

import static org.junit.jupiter.api.Assertions.assertThrows;

import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.LinkedHashSet;

import java.util.LinkedList;

import java.util.List;

import java.util.Set;

import java.util.TreeSet;

import java.util.Vector;

import org.junit.jupiter.api.Test;

/**

* Test class for {@link Means}.

* <p>

* This class provides comprehensive test coverage for all mean calculation

* methods,

* including edge cases, various collection types, and error conditions.

* </p>

class MeansTest {

private static final double EPSILON = 1e-9;

// ========== Arithmetic Mean Tests ==========

@Test

void testArithmeticMeanThrowsExceptionForEmptyList() {

List<Double> numbers = new ArrayList<>();

IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> Means.arithmetic(numbers));

assertTrue(exception.getMessage().contains("Empty list"));

}

@Test

void testArithmeticMeanSingleNumber() {

List<Double> numbers = Arrays.asList(2.5);

assertEquals(2.5, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanTwoNumbers() {

List<Double> numbers = Arrays.asList(2.0, 4.0);

assertEquals(3.0, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanMultipleNumbers() {

List<Double> numbers = Arrays.asList(1.0, 2.0, 3.0, 4.0, 5.0);

assertEquals(3.0, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanWithTreeSet() {

Set<Double> numbers = new TreeSet<>(Arrays.asList(1.0, 2.5, 83.3, 25.9999, 46.0001, 74.7, 74.5));

assertEquals(44.0, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanWithNegativeNumbers() {

List<Double> numbers = Arrays.asList(-5.0, -3.0, -1.0, 1.0, 3.0, 5.0);

assertEquals(0.0, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanWithDecimalNumbers() {

List<Double> numbers = Arrays.asList(1.1, 2.2, 3.3, 4.4, 5.5);

assertEquals(3.3, Means.arithmetic(numbers), EPSILON);

}

@Test

void testArithmeticMeanWithVector() {

Vector<Double> numbers = new Vector<>(Arrays.asList(10.0, 20.0, 30.0));

assertEquals(20.0, Means.arithmetic(numbers), EPSILON);

}

// ========== Geometric Mean Tests ==========

@Test

void testGeometricMeanThrowsExceptionForEmptyList() {

List<Double> numbers = new ArrayList<>();

IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> Means.geometric(numbers));

assertTrue(exception.getMessage().contains("Empty list"));

}

@Test

void testGeometricMeanSingleNumber() {

Set<Double> numbers = new LinkedHashSet<>(Arrays.asList(2.5));

assertEquals(2.5, Means.geometric(numbers), EPSILON);

}

@Test

void testGeometricMeanTwoNumbers() {

List<Double> numbers = Arrays.asList(2.0, 8.0);

assertEquals(4.0, Means.geometric(numbers), EPSILON);

}

@Test

void testGeometricMeanMultipleNumbers() {

LinkedList<Double> numbers = new LinkedList<>(Arrays.asList(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 1.25));

assertEquals(2.6426195539300585, Means.geometric(numbers), EPSILON);

}

@Test

void testGeometricMeanPerfectSquares() {

List<Double> numbers = Arrays.asList(1.0, 4.0, 9.0, 16.0);

double expected = Math.pow(1.0 * 4.0 * 9.0 * 16.0, 1.0 / 4.0);

assertEquals(expected, Means.geometric(numbers), EPSILON);

}

@Test

void testGeometricMeanIdenticalNumbers() {

List<Double> numbers = Arrays.asList(5.0, 5.0, 5.0, 5.0);

assertEquals(5.0, Means.geometric(numbers), EPSILON);

}

@Test

void testGeometricMeanWithLinkedHashSet() {

LinkedHashSet<Double> numbers = new LinkedHashSet<>(Arrays.asList(2.0, 4.0, 8.0));

double expected = Math.pow(2.0 * 4.0 * 8.0, 1.0 / 3.0);

assertEquals(expected, Means.geometric(numbers), EPSILON);

}

// ========== Harmonic Mean Tests ==========

@Test

void testHarmonicMeanThrowsExceptionForEmptyList() {

List<Double> numbers = new ArrayList<>();

IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> Means.harmonic(numbers));

assertTrue(exception.getMessage().contains("Empty list"));

}

@Test

void testHarmonicMeanSingleNumber() {

LinkedHashSet<Double> numbers = new LinkedHashSet<>(Arrays.asList(2.5));

assertEquals(2.5, Means.harmonic(numbers), EPSILON);

}

@Test

void testHarmonicMeanTwoNumbers() {

List<Double> numbers = Arrays.asList(2.0, 4.0);

double expected = 2.0 / (1.0 / 2.0 + 1.0 / 4.0);

assertEquals(expected, Means.harmonic(numbers), EPSILON);

}

@Test

void testHarmonicMeanMultipleNumbers() {

Vector<Double> numbers = new Vector<>(Arrays.asList(1.0, 2.5, 83.3, 25.9999, 46.0001, 74.7, 74.5));

assertEquals(4.6697322801074135, Means.harmonic(numbers), EPSILON);

}

@Test

void testHarmonicMeanThreeNumbers() {

List<Double> numbers = Arrays.asList(1.0, 2.0, 4.0);

double expected = 3.0 / (1.0 / 1.0 + 1.0 / 2.0 + 1.0 / 4.0);

assertEquals(expected, Means.harmonic(numbers), EPSILON);

}

@Test

void testHarmonicMeanIdenticalNumbers() {

List<Double> numbers = Arrays.asList(6.0, 6.0, 6.0);

assertEquals(6.0, Means.harmonic(numbers), EPSILON);

}

@Test

void testHarmonicMeanWithLinkedList() {

LinkedList<Double> numbers = new LinkedList<>(Arrays.asList(3.0, 6.0, 9.0));

double expected = 3.0 / (1.0 / 3.0 + 1.0 / 6.0 + 1.0 / 9.0);

assertEquals(expected, Means.harmonic(numbers), EPSILON);

}

// ========== Quadratic Mean Tests ==========

@Test

void testQuadraticMeanThrowsExceptionForEmptyList() {

List<Double> numbers = new ArrayList<>();

IllegalArgumentException exception = assertThrows(IllegalArgumentException.class, () -> Means.quadratic(numbers));

assertTrue(exception.getMessage().contains("Empty list"));

}

@Test

void testQuadraticMeanSingleNumber() {

LinkedHashSet<Double> numbers = new LinkedHashSet<>(Arrays.asList(2.5));

assertEquals(2.5, Means.quadratic(numbers), EPSILON);

}

@Test

void testQuadraticMeanTwoNumbers() {

List<Double> numbers = Arrays.asList(1.0, 7.0);

assertEquals(5.0, Means.quadratic(numbers), EPSILON);

}

@Test

void testQuadraticMeanMultipleNumbers() {

Vector<Double> numbers = new Vector<>(Arrays.asList(1.0, 2.5, 3.0, 7.5, 10.0));

double expected = Math.sqrt(34.5);

assertEquals(expected, Means.quadratic(numbers), EPSILON);

}

@Test

void testQuadraticMeanThreeNumbers() {

List<Double> numbers = Arrays.asList(3.0, 6.0, 9.0);

double expected = Math.sqrt(42.0);

assertEquals(expected, Means.quadratic(numbers), EPSILON);

}

@Test

void testQuadraticMeanIdenticalNumbers() {

List<Double> numbers = Arrays.asList(5.0, 5.0, 5.0);

assertEquals(5.0, Means.quadratic(numbers), EPSILON);

}

@Test

void testQuadraticMeanWithLinkedList() {

LinkedList<Double> numbers = new LinkedList<>(Arrays.asList(1.0, 5.0, 11.0));

assertEquals(7.0, Means.quadratic(numbers), EPSILON);

}

// ========== Additional Edge Case Tests ==========

@Test

void testArithmeticMeanWithVeryLargeNumbers() {

List<Double> numbers = Arrays.asList(1e100, 2e100, 3e100);

assertEquals(2e100, Means.arithmetic(numbers), 1e90);

}

@Test

void testArithmeticMeanWithVerySmallNumbers() {

List<Double> numbers = Arrays.asList(1e-100, 2e-100, 3e-100);

assertEquals(2e-100, Means.arithmetic(numbers), 1e-110);

}

@Test

void testGeometricMeanWithOnes() {

List<Double> numbers = Arrays.asList(1.0, 1.0, 1.0, 1.0);

assertEquals(1.0, Means.geometric(numbers), EPSILON);

}

@Test

void testAllMeansConsistencyForIdenticalValues() {

List<Double> numbers = Arrays.asList(7.5, 7.5, 7.5, 7.5);

double arithmetic = Means.arithmetic(numbers);

double geometric = Means.geometric(numbers);

double harmonic = Means.harmonic(numbers);

double quadratic = Means.quadratic(numbers);

assertEquals(7.5, arithmetic, EPSILON);

assertEquals(7.5, geometric, EPSILON);

assertEquals(7.5, harmonic, EPSILON);

assertEquals(7.5, quadratic, EPSILON);

}

@Test

void testMeansRelationship() {

// For positive numbers, harmonic mean ≤ geometric mean ≤ arithmetic mean ≤ quadratic mean

List<Double> numbers = Arrays.asList(2.0, 4.0, 8.0);

double arithmetic = Means.arithmetic(numbers);

double geometric = Means.geometric(numbers);

double harmonic = Means.harmonic(numbers);

double quadratic = Means.quadratic(numbers);

assertTrue(harmonic <= geometric, "Harmonic mean should be ≤ geometric mean");

assertTrue(geometric <= arithmetic, "Geometric mean should be ≤ arithmetic mean");

assertTrue(arithmetic <= quadratic, "Arithmetic mean should be ≤ quadratic mean");

}

Java/src/test/java/com/thealgorithms/maths/MeansTest.java at master · YanYan-Rf/Java · GitHub

Expand file tree

Breadcrumbs

MeansTest.java

Latest commit

History

Breadcrumbs

MeansTest.java

File metadata and controls