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Testing Interpolation Search Algorithm Implementation in Algorithms Repository

This test suite validates the InterpolationSearch algorithm implementation using JUnit’s parameterized testing capabilities. The tests verify both successful search scenarios and edge cases where values are not found in the sorted array.

Test Coverage Overview

The test suite provides comprehensive coverage of the InterpolationSearch algorithm, focusing on boundary conditions and typical use cases.

Tests both found and not-found scenarios
Validates positive and negative input values
Checks boundary conditions with values outside array range
Verifies exact matches within array bounds

Implementation Analysis

The testing approach utilizes JUnit 5’s parameterized testing features to efficiently test multiple scenarios with minimal code duplication.

Uses @ParameterizedTest annotation for data-driven testing
Implements @MethodSource for test data generation
Employs Google Truth assertions for readable verifications
Structured test data covering multiple edge cases

Technical Details

JUnit Jupiter framework with parameterized testing extension
Google Truth assertion library for enhanced readability
Static test data generation through Arguments factory
Organized test structure with clear input/output mapping

Best Practices Demonstrated

The test implementation showcases several testing best practices including data-driven test design and clear test case organization.

Descriptive test naming using parameter substitution
Efficient test data organization
Clear separation of test data and test logic
Comprehensive edge case coverage

williamfiset/algorithms

src/test/java/com/williamfiset/algorithms/search/InterpolationSearchTest.java

            
package com.williamfiset.algorithms.search;

import static com.google.common.truth.Truth.assertThat;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.*;

public class InterpolationSearchTest {

  private static Arguments[] inputs() {
    return new Arguments[] {
      Arguments.of(2, 2), Arguments.of(5, 5), Arguments.of(-1, -1), Arguments.of(8, -1)
    };
  }

  @ParameterizedTest(name = "Search value: {0}, Expected index: {1}")
  @MethodSource("inputs")
  public void testCoverage(int val, int expected) {
    int[] arr = {0, 1, 2, 3, 4, 5};
    int index = InterpolationSearch.interpolationSearch(arr, val);
    assertThat(index).isEqualTo(expected);
  }
}