[libgee] tests: implement read_only in testmap Entry

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit 4e6cc9209a2853f6b3ded41b70a1902ed9f3eee1
Author: Alban Browaeys <prahal yahoo com>
Date:   Mon Aug 20 18:49:57 2012 +0200

    tests: implement read_only in testmap Entry

 tests/testmap.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/tests/testmap.vala b/tests/testmap.vala
index 4507763..464ec0f 100644
--- a/tests/testmap.vala
+++ b/tests/testmap.vala
@@ -579,6 +579,7 @@ public abstract class MapTests : Gee.TestCase {
 		public override K key { get {return _key; } }
 		private K _key;
 		public override V value { get; set; }
+		public override bool read_only { get { return false; } }
 	}
 }