1 files changed, 93 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_graphs-04.js b/devtools/client/shared/test/browser_graphs-04.js
new file mode 100644
index 0000000000..d5f09c2428
--- /dev/null
+++ b/devtools/client/shared/test/browser_graphs-04.js
@@ -0,0 +1,93 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that graph widgets can correctly compare selections and cursors.
+
+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 graph.once("ready");
+
+  testGraph(graph);
+
+  await graph.destroy();
+  host.destroy();
+}
+
+function testGraph(graph) {
+  ok(!graph.hasSelection(), "There shouldn't initially be any selection.");
+  is(
+    graph.getSelectionWidth(),
+    0,
+    "The selection width should be 0 when there's no selection."
+  );
+
+  graph.setSelection({ start: 100, end: 200 });
+
+  ok(graph.hasSelection(), "There should now be a selection.");
+  is(graph.getSelectionWidth(), 100, "The selection width should now be 100.");
+
+  ok(
+    graph.isSelectionDifferent({ start: 100, end: 201 }),
+    "The selection was correctly reported to be different (1)."
+  );
+  ok(
+    graph.isSelectionDifferent({ start: 101, end: 200 }),
+    "The selection was correctly reported to be different (2)."
+  );
+  ok(
+    graph.isSelectionDifferent({ start: null, end: null }),
+    "The selection was correctly reported to be different (3)."
+  );
+  ok(
+    graph.isSelectionDifferent(null),
+    "The selection was correctly reported to be different (4)."
+  );
+
+  ok(
+    !graph.isSelectionDifferent({ start: 100, end: 200 }),
+    "The selection was incorrectly reported to be different (1)."
+  );
+  ok(
+    !graph.isSelectionDifferent(graph.getSelection()),
+    "The selection was incorrectly reported to be different (2)."
+  );
+
+  graph.setCursor({ x: 100, y: 50 });
+
+  ok(
+    graph.isCursorDifferent({ x: 100, y: 51 }),
+    "The cursor was correctly reported to be different (1)."
+  );
+  ok(
+    graph.isCursorDifferent({ x: 101, y: 50 }),
+    "The cursor was correctly reported to be different (2)."
+  );
+  ok(
+    graph.isCursorDifferent({ x: null, y: null }),
+    "The cursor was correctly reported to be different (3)."
+  );
+  ok(
+    graph.isCursorDifferent(null),
+    "The cursor was correctly reported to be different (4)."
+  );
+
+  ok(
+    !graph.isCursorDifferent({ x: 100, y: 50 }),
+    "The cursor was incorrectly reported to be different (1)."
+  );
+  ok(
+    !graph.isCursorDifferent(graph.getCursor()),
+    "The cursor was incorrectly reported to be different (2)."
+  );
+}