1 files changed, 59 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_safeErrorString.js b/devtools/shared/tests/xpcshell/test_safeErrorString.js
new file mode 100644
index 0000000000..1d2e5431ed
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_safeErrorString.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test DevToolsUtils.safeErrorString
+
+function run_test() {
+  test_with_error();
+  test_with_tricky_error();
+  test_with_string();
+  test_with_thrower();
+  test_with_psychotic();
+}
+
+function test_with_error() {
+  const s = DevToolsUtils.safeErrorString(new Error("foo bar"));
+  // Got the message.
+  Assert.ok(s.includes("foo bar"));
+  // Got the stack.
+  Assert.ok(s.includes("test_with_error"));
+  Assert.ok(s.includes("test_safeErrorString.js"));
+  // Got the lineNumber and columnNumber.
+  Assert.ok(s.includes("Line"));
+  Assert.ok(s.includes("column"));
+}
+
+function test_with_tricky_error() {
+  const e = new Error("batman");
+  e.stack = { toString: Object.create(null) };
+  const s = DevToolsUtils.safeErrorString(e);
+  // Still got the message, despite a bad stack property.
+  Assert.ok(s.includes("batman"));
+}
+
+function test_with_string() {
+  const s = DevToolsUtils.safeErrorString("not really an error");
+  // Still get the message.
+  Assert.ok(s.includes("not really an error"));
+}
+
+function test_with_thrower() {
+  const s = DevToolsUtils.safeErrorString({
+    toString: () => {
+      throw new Error("Muahahaha");
+    },
+  });
+  // Still don't fail, get string back.
+  Assert.equal(typeof s, "string");
+}
+
+function test_with_psychotic() {
+  const s = DevToolsUtils.safeErrorString({
+    toString: () => Object.create(null),
+  });
+  // Still get a string out, and no exceptions thrown
+  Assert.equal(typeof s, "string");
+  Assert.equal(s, "[object Object]");
+}