PCBC-746: add tests for transcoding empty value

Change-Id: Ic1155bded6597f7e2bec8baf0c366c0bab46735f
Reviewed-on: http://review.couchbase.org/c/php-couchbase/+/144286
Tested-by: Build Bot <[email protected]>
Reviewed-by: Sergey Avseyev <[email protected]>

Author: avsej

tests/BucketTest.php

@@ -3,6 +3,8 @@
 
 use \Couchbase\Cluster;
 use \Couchbase\ClusterOptions;
+use \Couchbase\GetOptions;
+use \Couchbase\UpsertOptions;
 
 class BucketTest extends CouchbaseTestCase {
 
@@ -77,6 +79,62 @@ function testBasicGet($c, $key) {
         return $key;
     }
 
+    /**
+     * Test reaction on empty value
+     *
+     * @depends testConnect
+     */
+    function testReadingEmptyString($c) {
+        $key = $this->makeKey('emptyString');
+
+        $passThruDecoder = function($bytes, $flags, $datatype) { return $bytes; };
+        $passThruEncoder = function($value) { return [$value, 0x00, 0x00]; };
+
+        $res = $c->upsert($key, "");
+        $this->assertNotNull($res->cas());
+        $cas = $res->cas();
+
+        $res = $c->get($key);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), "");
+
+        $options = new GetOptions();
+        $options->decoder($passThruDecoder);
+        $res = $c->get($key, $options);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), "");
+
+        $options = new UpsertOptions();
+        $options->encoder($passThruEncoder);
+        $res = $c->upsert($key, "", $options);
+        $this->assertNotNull($res->cas());
+        $cas = $res->cas();
+
+        $res = $c->get($key);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), "");
+
+        $options = new GetOptions();
+        $options->decoder($passThruDecoder);
+        $res = $c->get($key, $options);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), "");
+
+        $res = $c->upsert($key, null);
+        $this->assertNotNull($res->cas());
+        $cas = $res->cas();
+
+        $res = $c->get($key);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), null);
+
+        $options = new GetOptions();
+        $options->decoder($passThruDecoder);
+        $res = $c->get($key, $options);
+        $this->assertEquals($cas, $res->cas());
+        $this->assertEquals($res->content(), "null");
+    }
+
     /**
      * Test basic remove
      *