Improve assertion messages

Author: adutra

integration-tests/src/test/java/com/datastax/dse/driver/api/core/cql/continuous/ContinuousPagingITBase.java

@@ -105,17 +105,21 @@ public static Object[][] pagingOptions() {
 
   protected void validateMetrics(CqlSession session) {
     Node node = session.getMetadata().getNodes().values().iterator().next();
-    assertThat(session.getMetrics()).isPresent();
+    assertThat(session.getMetrics()).as("assert session.getMetrics() present").isPresent();
     Metrics metrics = session.getMetrics().get();
-    assertThat(metrics.getNodeMetric(node, DefaultNodeMetric.CQL_MESSAGES)).isPresent();
+    assertThat(metrics.getNodeMetric(node, DefaultNodeMetric.CQL_MESSAGES))
+        .as("assert metrics.getNodeMetric(node, DefaultNodeMetric.CQL_MESSAGES) present")
+        .isPresent();
     Timer messages = (Timer) metrics.getNodeMetric(node, DefaultNodeMetric.CQL_MESSAGES).get();
-    assertThat(messages.getCount()).isGreaterThan(0);
-    assertThat(messages.getMeanRate()).isGreaterThan(0);
-    assertThat(metrics.getSessionMetric(DseSessionMetric.CONTINUOUS_CQL_REQUESTS)).isPresent();
+    assertThat(messages.getCount()).as("assert messages.getCount() >= 0").isGreaterThan(0);
+    assertThat(messages.getMeanRate()).as("assert messages.getMeanRate() >= 0").isGreaterThan(0);
+    assertThat(metrics.getSessionMetric(DseSessionMetric.CONTINUOUS_CQL_REQUESTS))
+        .as("assert metrics.getSessionMetric(DseSessionMetric.CONTINUOUS_CQL_REQUESTS) present")
+        .isPresent();
     Timer requests =
         (Timer) metrics.getSessionMetric(DseSessionMetric.CONTINUOUS_CQL_REQUESTS).get();
-    assertThat(requests.getCount()).isGreaterThan(0);
-    assertThat(requests.getMeanRate()).isGreaterThan(0);
+    assertThat(requests.getCount()).as("assert requests.getCount() >= 0").isGreaterThan(0);
+    assertThat(requests.getMeanRate()).as("assert requests.getMeanRate() >= 0").isGreaterThan(0);
   }
 
   public static class Options {