protobuf/java/src/test/java/com/google/protobuf/LiteEqualsAndHashTest.java

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package com.google.protobuf;

import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Bar;
import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.BarPrime;
import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Foo;

import junit.framework.TestCase;

/**
 * Test generate equal and hash methods for the lite runtime.
 *
 * @author pbogle@google.com Phil Bogle
 */
public class LiteEqualsAndHashTest extends TestCase {

  public void testEquals() throws Exception {
    // Since the generated equals and hashCode methods for lite messages are a
    // mostly complete subset of those for regular messages, we can mostly assume
    // that the generated methods are already thoroughly tested by the regular tests.

    // This test mostly just verifies is that a proto with
    // optimize_for = LITE_RUNTIME and java_generates_equals_and_hash_compiles
    // correctly when linked only against the lite library.

    // We do however do some basic testing to make sure that equals is actually
    // overriden to test for value equality rather than simple object equality.

    // Check that two identical objs are equal.
    Foo foo1a = Foo.newBuilder()
        .setValue(1)
        .addBar(Bar.newBuilder().setName("foo1"))
        .build();
    Foo foo1b = Foo.newBuilder()
        .setValue(1)
        .addBar(Bar.newBuilder().setName("foo1"))
        .build();
    Foo foo2 = Foo.newBuilder()
        .setValue(1)
        .addBar(Bar.newBuilder().setName("foo2"))
        .build();

    // Check that equals is doing value rather than object equality.
    assertEquals(foo1a, foo1b);
    assertEquals(foo1a.hashCode(), foo1b.hashCode());

    // Check that a diffeent object is not equal.
    assertFalse(foo1a.equals(foo2));

    // Check that two objects which have different types but the same field values are not
    // considered to be equal.
    Bar bar = Bar.newBuilder().setName("bar").build();
    BarPrime barPrime = BarPrime.newBuilder().setName("bar").build();
    assertFalse(bar.equals(barPrime));
  }
}