1 files changed, 38 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_graphs-09d.js b/devtools/client/shared/test/browser_graphs-09d.js
new file mode 100644
index 0000000000..3f34884490
--- /dev/null
+++ b/devtools/client/shared/test/browser_graphs-09d.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that line graphs hide the 'max' tooltip when the distance between
+// the 'min' and 'max' tooltip is too small.
+
+const TEST_DATA = [
+  { delta: 100, value: 60 },
+  { delta: 200, value: 59.9 },
+];
+const LineGraphWidget = require("devtools/client/shared/widgets/LineGraphWidget");
+
+add_task(async function() {
+  await addTab("about:blank");
+  await performTest();
+  gBrowser.removeCurrentTab();
+});
+
+async function performTest() {
+  const { host, doc } = await createHost();
+  const graph = new LineGraphWidget(doc.body, "fps");
+
+  await testGraph(graph);
+
+  await graph.destroy();
+  host.destroy();
+}
+
+async function testGraph(graph) {
+  await graph.setDataWhenReady(TEST_DATA);
+
+  is(graph._gutter.hidden, false, "The gutter should not be hidden.");
+  is(graph._maxTooltip.hidden, true, "The max tooltip should be hidden.");
+  is(graph._avgTooltip.hidden, false, "The avg tooltip should not be hidden.");
+  is(graph._minTooltip.hidden, false, "The min tooltip should not be hidden.");
+}