Initial backend for metrics in Observatory

tests/lib/profiler/metrics_test.dart

Index: tests/lib/profiler/metrics_test.dart
diff --git a/tests/lib/profiler/metrics_test.dart b/tests/lib/profiler/metrics_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..55e85b189cbfe589752e953ccabdca06b1f716b0
--- /dev/null
+++ b/tests/lib/profiler/metrics_test.dart
@@ -0,0 +1,116 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+
+import 'dart:profiler';
+import 'package:expect/expect.dart';
+
+testGauge1() {
+  var gauge = new Gauge('test', 'alpha bravo', 0.0, 100.0);
+  Expect.equals(0.0, gauge.min);
+  Expect.equals(0.0, gauge.value);
+  Expect.equals(100.0, gauge.max);
+  Expect.equals('test', gauge.name);
+  Expect.equals('alpha bravo', gauge.description);
+  gauge.value = 44.0;
+  Expect.equals(44.0, gauge.value);
+  // Test setting below min.
+  gauge.value = -1.0;
+  Expect.equals(0.0, gauge.value);
+  // Test setting above max.
+  gauge.value = 101.0;
+  Expect.equals(100.0, gauge.value);
+}
+
+testGauge2() {
+  var gauge = new Gauge('test', 'alpha bravo', 1.0, 2.0);
+  Expect.equals(1.0, gauge.min);
+  Expect.equals(2.0, gauge.max);
+  Expect.equals(gauge.min, gauge.value);
+  Expect.equals('test', gauge.name);
+  Expect.equals('alpha bravo', gauge.description);
+
+  Expect.throws(() {
+    // min > max.
+    gauge = new Gauge.range('test', 'alpha bravo', 2.0, 1.0);
+  });
+
+  Expect.throws(() {
+    // min == max.
+    gauge = new Gauge.range('test', 'alpha bravo', 1.0, 1.0);
+  });
+
+  Expect.throws(() {
+    // min is null
+    gauge = new Gauge.range('test', 'alpha bravo', null, 1.0);
+  });
+
+  Expect.throws(() {
+    // min is not a double
+    gauge = new Gauge.range('test', 'alpha bravo', 'string', 1.0);
+  });
+
+  Expect.throws(() {
+    // max is null
+    gauge = new Gauge.range('test', 'alpha bravo', 1.0, null);
+  });
+
+  Expect.throws(() {
+    // max is not a double
+    gauge = new Gauge.range('test', 'alpha bravo', 1.0, 4);
+  });
+}
+
+testCounter() {
+  var counter = new Counter('test', 'alpha bravo');
+  Expect.equals(0.0, counter.value);
+  Expect.equals('test', counter.name);
+  Expect.equals('alpha bravo', counter.description);
+  counter.value = 1.0;
+  Expect.equals(1.0, counter.value);
+}
+
+class CustomCounter extends Counter {
+  CustomCounter(name, description) : super(name, description);
+  // User provided getter.
+  double get value => 77.0;
+}
+
+testCustomCounter() {
+  var counter = new CustomCounter('test', 'alpha bravo');
+  Expect.equals(77.0, counter.value);
+  Expect.equals('test', counter.name);
+  Expect.equals('alpha bravo', counter.description);
+  // Should have no effect.
+  counter.value = 1.0;
+  Expect.equals(77.0, counter.value);
+}
+
+testMetricNameCollision() {
+  var counter = new Counter('a.b.c', 'alpha bravo charlie');
+  var counter2 = new Counter('a.b.c', 'alpha bravo charlie collider');
+  Metrics.register(counter);
+  Expect.throws(() {
+    Metrics.register(counter2);
+  });
+  Metrics.deregister(counter);
+  Metrics.register(counter);
+  var counter3 = new Counter('a.b.c.d', '');
+  Metrics.register(counter3);
+}
+
+testBadName() {
+  Expect.throws(() {
+    var counter = new Counter('a.b/c', 'description');
+  });
+}
+
+main() {
+  testGauge1();
+  testGauge2();
+  testCounter();
+  testCustomCounter();
+  testMetricNameCollision();
+  testBadName();
+}