1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/errors/error-report.js b/js/src/jit-test/tests/errors/error-report.js
new file mode 100644
index 0000000000..978c25f9b8
--- /dev/null
+++ b/js/src/jit-test/tests/errors/error-report.js
@@ -0,0 +1,51 @@
+{
+    // Plain-old Error object
+    let error = new Error("foobar");
+
+    let report = createErrorReport(error);
+    assertEq(report.toStringResult, "Error: foobar");
+    assertEq(report.name, "Error");
+    assertEq(report.message, "foobar");
+}
+
+{
+    // Error object with overwritten properties
+    let error = new Error("foobar");
+    error.name = "MyError";
+    error.message = "here";
+
+    let report = createErrorReport(error);
+    assertEq(report.toStringResult, "MyError: here");
+    assertEq(report.name, "Error");
+    assertEq(report.message, "here");
+}
+
+{
+    // Plain object, which doesn't quack (enough) like an Error
+    let obj = {name: "foo", message: "bar"};
+
+    let report = createErrorReport(obj);
+    assertEq(report.toStringResult, "uncaught exception: [object Object]");
+    assertEq(report.name, "");
+    assertEq(report.message, "uncaught exception: [object Object]");
+}
+
+{
+    // Duck-typed error object
+    let obj = {name: "foo", message: "bar", fileName: "test", lineNumber: 0};
+
+    let report = createErrorReport(obj);
+    assertEq(report.toStringResult, "foo: bar");
+    assertEq(report.name, "");
+    assertEq(report.message, "foo: bar");
+}
+
+{
+    // toString failure
+    let obj = {toString() { throw "haha"; }};
+
+    let report = createErrorReport(obj);
+    assertEq(report.toStringResult, "uncaught exception: unknown (can't convert to string)");
+    assertEq(report.name, "");
+    assertEq(report.message, "uncaught exception: unknown (can't convert to string)");
+}