Syquel commented on a change in pull request #12:
URL: https://github.com/apache/maven-gpg-plugin/pull/12#discussion_r583828058
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File path: src/test/java/org/apache/maven/plugins/gpg/GpgVersionTest.java
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@@ -48,4 +50,22 @@ public void testOpposite()
assertFalse( GpgVersion.parse( "gpg (GnuPG) 2.0.26 (Gpg4win 2.2.3)" )
.isBefore( GpgVersion.parse( "2.0.26" ) ) );
}
+
+ @Test
+ public void testEquality()
+ {
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.2.1" ),
GpgVersion.parse( "gpg (GnuPG) 2.2.1" ) );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.2.1" ),
GpgVersion.parse( "2.2.1" ) );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG/MacGPG2) 2.2.10" ),
GpgVersion.parse( "2.2.10" ) );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.0.26 (Gpg4win 2.2.3)"
), GpgVersion.parse( "2.0.26" ) );
+
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.2.1" ).hashCode(),
GpgVersion.parse( "gpg (GnuPG) 2.2.1" ).hashCode() );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.2.1" ).hashCode(),
GpgVersion.parse( "2.2.1" ).hashCode() );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG/MacGPG2) 2.2.10"
).hashCode(), GpgVersion.parse( "2.2.10" ).hashCode() );
+ assertEquals( GpgVersion.parse( "gpg (GnuPG) 2.0.26 (Gpg4win 2.2.3)"
).hashCode(), GpgVersion.parse( "2.0.26" ).hashCode() );
+
+ assertNotEquals( GpgVersion.parse( "gpg (GnuPG) 2.2.1" ),
GpgVersion.parse( "2.2.0" ) );
Review comment:
While objects which are equal must produce the same hash code it is
neither required nor expected that unequal objects always produce different
hash codes.
`Arrays.hashCode` should already provide a reasonable implementation to
minimize hash collisions.
[Object#hashCode
JavaDoc](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--):
> Returns a hash code value for the object. This method is supported for the
benefit of hash tables such as those provided by java.util.HashMap.
> The general contract of hashCode is:
> [ ... ]
> * If two objects are equal according to the equals(Object) method, then
calling the hashCode method on each of the two objects must produce the same
integer result.
> * It is not required that if two objects are unequal according to the
equals(Object) method, then calling the hashCode method on each of the two
objects must produce distinct integer results. However, the programmer should
be aware that producing distinct integer results for unequal objects may
improve the performance of hash tables.
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