add unit test to active query tracker

tracker_test.go

@@ -0,0 +1,42 @@
+// Copyright 2020 Pilosa Corp.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pilosa
+
+import "testing"
+
+func TestQueryTracker(t *testing.T) {
+	tracker := newQueryTracker()
+	defer tracker.Stop()
+
+	if queries := tracker.ActiveQueries(); len(queries) > 0 {
+		t.Fatalf("expected no active queries; found %v", queries)
+	}
+
+	qs := tracker.Start("test query")
+
+	var queries []ActiveQueryStatus
+	for len(queries) < 1 {
+		queries = tracker.ActiveQueries()
+	}
+	if len(queries) > 1 || queries[0].Query != "test query" {
+		t.Fatalf("unexpected queries: %v", queries)
+	}
+
+	tracker.Finish(qs)
+
+	for len(queries) > 0 {
+		queries = tracker.ActiveQueries()
+	}
+}