fixed small issue in run_tests.sh and remove duplicate in CallTest.php

src/php/bin/run_tests.sh

@@ -32,9 +32,8 @@ php $extension_dir -d max_execution_time=300 $(which phpunit) -v --debug \
 export ZEND_DONT_UNLOAD_MODULES=1
 export USE_ZEND_ALLOC=0
 # Detect whether valgrind is executable
-if ! [ -x "$(command -v valgrind)" ]; then
-  echo 'Error: valgrind is not installed and is not executable' >&2
-  exit 1
-fi
-valgrind --error-exitcode=10 --leak-check=yes php $extension_dir -d max_execution_time=300 \
+if [ -x "$(command -v valgrind)" ]; then
+  valgrind --error-exitcode=10 --leak-check=yes php $extension_dir -d max_execution_time=300 \
 	../tests/MemoryLeakTest/MemoryLeakTest.php
+  exit 0
+fi

src/php/tests/unit_tests/CallTest.php

@@ -96,16 +96,6 @@ class CallTest extends PHPUnit_Framework_TestCase
         $this->assertTrue($result->send_metadata);
     }
 
-    public function testAddMultiAndMultiValueMetadata()
-    {
-        $batch = [
-            Grpc\OP_SEND_INITIAL_METADATA => ['key1' => ['value1', 'value2'],
-                                              'key2' => ['value3', 'value4'],],
-        ];
-        $result = $this->call->startBatch($batch);
-        $this->assertTrue($result->send_metadata);
-    }
-
     public function testGetPeer()
     {
         $this->assertTrue(is_string($this->call->getPeer()));