1 files changed, 108 insertions, 0 deletions
diff --git a/toolkit/components/osfile/tests/xpcshell/test_exception.js b/toolkit/components/osfile/tests/xpcshell/test_exception.js
new file mode 100644
index 0000000000..5a4ffc8441
--- /dev/null
+++ b/toolkit/components/osfile/tests/xpcshell/test_exception.js
@@ -0,0 +1,108 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Test that functions throw the appropriate exceptions.
+ */
+
+"use strict";
+
+var EXISTING_FILE = do_get_file("xpcshell.ini").path;
+
+// Tests on |open|
+
+add_test_pair(async function test_typeerror() {
+  let exn;
+  try {
+    let fd = await OS.File.open("/tmp", { no_such_key: 1 });
+    info("Fd: " + fd);
+  } catch (ex) {
+    exn = ex;
+  }
+  info("Exception: " + exn);
+  Assert.ok(exn.constructor.name == "TypeError");
+});
+
+// Tests on |read|
+
+add_test_pair(async function test_bad_encoding() {
+  info("Testing with a wrong encoding");
+  try {
+    await OS.File.read(EXISTING_FILE, { encoding: "baby-speak-encoded" });
+    do_throw("Should have thrown with an ex.becauseInvalidArgument");
+  } catch (ex) {
+    if (ex.becauseInvalidArgument) {
+      info("Wrong encoding caused the correct exception");
+    } else {
+      throw ex;
+    }
+  }
+
+  try {
+    await OS.File.read(EXISTING_FILE, { encoding: 4 });
+    do_throw("Should have thrown a TypeError");
+  } catch (ex) {
+    if (ex.constructor.name == "TypeError") {
+      // Note that TypeError doesn't carry across compartments
+      info("Non-string encoding caused the correct exception");
+    } else {
+      throw ex;
+    }
+  }
+});
+
+add_test_pair(async function test_bad_compression() {
+  info("Testing with a non-existing compression");
+  try {
+    await OS.File.read(EXISTING_FILE, { compression: "mmmh-crunchy" });
+    do_throw("Should have thrown with an ex.becauseInvalidArgument");
+  } catch (ex) {
+    if (ex.becauseInvalidArgument) {
+      info("Wrong encoding caused the correct exception");
+    } else {
+      throw ex;
+    }
+  }
+
+  info("Testing with a bad type for option compression");
+  try {
+    await OS.File.read(EXISTING_FILE, { compression: 5 });
+    do_throw("Should have thrown a TypeError");
+  } catch (ex) {
+    if (ex.constructor.name == "TypeError") {
+      // Note that TypeError doesn't carry across compartments
+      info("Non-string encoding caused the correct exception");
+    } else {
+      throw ex;
+    }
+  }
+});
+
+add_test_pair(async function test_bad_bytes() {
+  info("Testing with a bad type for option bytes");
+  try {
+    await OS.File.read(EXISTING_FILE, { bytes: "five" });
+    do_throw("Should have thrown a TypeError");
+  } catch (ex) {
+    if (ex.constructor.name == "TypeError") {
+      // Note that TypeError doesn't carry across compartments
+      info("Non-number bytes caused the correct exception");
+    } else {
+      throw ex;
+    }
+  }
+});
+
+add_test_pair(async function read_non_existent() {
+  info("Testing with a non-existent file");
+  try {
+    await OS.File.read("I/do/not/exist");
+    do_throw("Should have thrown with an ex.becauseNoSuchFile");
+  } catch (ex) {
+    if (ex.becauseNoSuchFile) {
+      info("Correct exceptions");
+    } else {
+      throw ex;
+    }
+  }
+});