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Testing ObjectKey Signature Generation in Glide

This test suite validates the ObjectKey implementation in Glide’s signature system, focusing on key equality, hash code generation, and message digest functionality. The tests ensure consistent object identification and caching behavior in the Glide image loading library.

Test Coverage Overview

The test suite provides comprehensive coverage of ObjectKey’s core functionality, focusing on object equality comparisons and hash code generation.

Tests equivalent object key pairs with same underlying objects
Verifies distinct keys for different objects
Validates string-based key equality
Includes regression testing with specific hash expectations

Implementation Analysis

The testing approach uses JUnit4 framework with a custom KeyTester utility to streamline equivalence testing. The implementation leverages equivalence groups to verify correct object identity preservation and hash code consistency across multiple scenarios.

The test structure employs method chaining pattern with the KeyTester utility, allowing for concise and readable test cases that cover multiple aspects of key behavior in a single test method.

Technical Details

JUnit4 test runner and annotations
Custom KeyTester utility for equivalence testing
NoSuchAlgorithmException handling for digest operations
SHA-256 hash verification for regression testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Java unit testing.

Rule-based test configuration
Grouped assertion testing
Regression test hash verification
Clear test method naming
Efficient test case organization

bumptech/glide

library/test/src/test/java/com/bumptech/glide/signature/ObjectKeyTest.java

            
package com.bumptech.glide.signature;

import com.bumptech.glide.tests.KeyTester;
import java.security.NoSuchAlgorithmException;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class ObjectKeyTest {
  @Rule public final KeyTester keyTester = new KeyTester();

  @Test
  public void testEqualsHashCodeAndDigest() throws NoSuchAlgorithmException {
    Object object = new Object();
    keyTester
        .addEquivalenceGroup(new ObjectKey(object), new ObjectKey(object))
        .addEquivalenceGroup(new ObjectKey(new Object()))
        .addEquivalenceGroup(new ObjectKey("test"), new ObjectKey("test"))
        .addRegressionTest(
            new ObjectKey("test"),
            "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08")
        .test();
  }
}