Add integration test for label_replace

scripts/docker-integration-tests/query_fanout/warning.sh

@@ -203,7 +203,6 @@ function test_label_values {
 ATTEMPTS=3 TIMEOUT=1 retry_with_backoff test_label_values 100
 ATTEMPTS=3 TIMEOUT=1 retry_with_backoff test_label_values 1 max_fetch_series_limit_applied
 
-
 GRAPHITE="foo.bar.$t"
 function write_carbon {
   CLUSTER=$1
@@ -307,3 +306,24 @@ ATTEMPTS=3 TIMEOUT=1 retry_with_backoff render_carbon 9 14 max_fetch_series_limi
 ATTEMPTS=3 TIMEOUT=1 retry_with_backoff find_carbon 16 remote_store_cluster-c_complete_tags_warning
 ATTEMPTS=3 TIMEOUT=1 retry_with_backoff find_carbon 9 max_fetch_series_limit_applied,remote_store_cluster-c_complete_tags_warning
 
+# NB (arnikola): following tests are unrelated to fanout but there's no good
+# testbed story yet; reported query execution errors will be added here and
+# migrated to a proper testbed when it becomes available.
+
+function func {
+  QUERY=$1
+  EXPECTED_COUNT=$2
+  EXPECTED=$3
+  RESPONSE=$(curl -sSL "http://localhost:7201/api/v1/query?query=$QUERY")
+  ACTUAL_COUNT=$(echo $RESPONSE | jq '.data.result | length')
+  ACTUAL=$(echo $RESPONSE | jq .data.result[].metric.foo | tr "\n" ":")
+  CONCAT=$(echo $EXPECTED | tr " " ":")
+  test $ACTUAL_COUNT = $EXPECTED_COUNT && test $ACTUAL = $CONCAT
+}
+
+METRIC_NAME="quail_$t"
+write_metrics coordinator-cluster-a 5
+func "label_replace($METRIC_NAME,\"foo\",\"bar_\$1\",\"val\",\"(.*)\")" label_replace 5 "\"bar_0\" \"bar_1\" \"bar_2\" \"bar_3\" \"bar_4\""
+
+## Regression suite vs user reports
+func "label_replace($METRIC_NAME,\"foo\",\"bar_\$1\",\"val\",\"(.*)\")+0" label_replace 5 "\"bar_0\" \"bar_1\" \"bar_2\" \"bar_3\" \"bar_4\""