1 files changed, 92 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-features-breakable-lines.js b/devtools/client/debugger/test/mochitest/browser_dbg-features-breakable-lines.js
new file mode 100644
index 0000000000..872530025f
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+++ b/devtools/client/debugger/test/mochitest/browser_dbg-features-breakable-lines.js
@@ -0,0 +1,92 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+"use strict";
+
+const testServer = createVersionizedHttpTestServer(
+  "examples/sourcemaps-reload-uncompressed"
+);
+const TEST_URL = testServer.urlFor("index.html");
+
+// Assert the behavior of the gutter that grays out non-breakable lines
+add_task(async function testBreakableLinesOverReloads() {
+  const dbg = await initDebuggerWithAbsoluteURL(
+    TEST_URL,
+    "index.html",
+    "script.js",
+    "original.js"
+  );
+
+  info("Assert breakable lines of the first html page load");
+  await assertBreakableLines(dbg, "index.html", 78, [
+    ...getRange(16, 17),
+    21,
+    ...getRange(24, 25),
+    30,
+    36,
+  ]);
+
+  info("Assert breakable lines of the first original source file, original.js");
+  // The length of original.js is longer than the test file
+  // because the sourcemap replaces the content of the original file
+  // and appends a few lines with a "WEBPACK FOOTER" comment
+  // All the appended lines are empty lines or comments, so none of them are breakable.
+  await assertBreakableLines(dbg, "original.js", 15, [
+    ...getRange(1, 3),
+    5,
+    ...getRange(8, 10),
+  ]);
+
+  info("Assert breakable lines of the simple first load of script.js");
+  await assertBreakableLines(dbg, "script.js", 9, [1, 5, 7, 8, 9]);
+
+  info("Assert breakable lines of the first iframe page load");
+  await assertBreakableLines(dbg, "iframe.html", 30, [
+    ...getRange(16, 17),
+    ...getRange(22, 23),
+  ]);
+
+  info(
+    "Reload the page, wait for sources and assert that breakable lines get updated"
+  );
+  testServer.switchToNextVersion();
+  await reload(dbg, "index.html", "script.js", "original.js", "iframe.html");
+
+  // Wait for previously selected source to be re-selected after reload
+  // otherwise it may overlap with the next source selected by assertBreakableLines.
+  await waitForSelectedSource(dbg, "iframe.html");
+
+  info("Assert breakable lines of the more complex second load of script.js");
+  await assertBreakableLines(dbg, "script.js", 23, [2, ...getRange(13, 23)]);
+
+  info("Assert breakable lines of the second html page load");
+  await assertBreakableLines(dbg, "index.html", 33, [25, 27]);
+
+  info("Assert breakable lines of the second orignal file");
+  // See first assertion about original.js,
+  // the size of original.js doesn't match the size of the test file
+  await assertBreakableLines(dbg, "original.js", 18, [
+    ...getRange(1, 3),
+    ...getRange(8, 11),
+    13,
+  ]);
+
+  await selectSource(dbg, "iframe.html");
+  // When EFT is disabled, iframe.html is a regular source and the right content is displayed
+  if (isEveryFrameTargetEnabled()) {
+    is(
+      getCM(dbg).getValue(),
+      `Error: Incorrect contents fetched, please reload.`
+    );
+  }
+  /**
+   * Bug 1762381 - Can't assert breakable lines yet, because the iframe page content fails loading
+
+  info("Assert breakable lines of the second iframe page load");
+  await assertBreakableLines(dbg, "iframe.html", 27, [
+    ...getRange(15, 17),
+    ...getRange(21, 23),
+  ]);
+  */
+});