avoid requiring that json parsing consumes all input

(the input could end with \n if human readable)

1 files changed, 1 insertions, 1 deletions

diff --git a/metrics/src/tests/metricmanagertest.cpp b/metrics/src/tests/metricmanagertest.cpp
index a086cf70ca9..aea13de69da 100644
--- a/metrics/src/tests/metricmanagertest.cpp
+++ b/metrics/src/tests/metricmanagertest.cpp
@@ -779,7 +779,7 @@ void MetricManagerTest::testJsonOutput()
     using namespace vespalib::slime;
     vespalib::Slime slime;
     size_t parsed = JsonFormat::decode(vespalib::Memory(jsonData), slime);
-    if (jsonData.size() != parsed) {
+    if (!parsed) {
         vespalib::SimpleBuffer buffer;
         JsonFormat::encode(slime, buffer, false);
         std::ostringstream ost;