Add node tests for message_edit.get_editability.

frontend_tests/node_tests/message_edit.js

@@ -0,0 +1,70 @@
+set_global('document', null);
+set_global('page_params', {});
+
+add_dependencies({
+    XDate: 'third/xdate/xdate.dev.js',
+});
+
+var message_edit = require('js/message_edit.js');
+var get_editability = message_edit.get_editability;
+var editability_types = message_edit.editability_types;
+
+(function test_get_editability() {
+    // You can't edit a null message
+    assert.equal(get_editability(null), editability_types.NO);
+    // You can't edit a message you didn't send
+    assert.equal(get_editability({
+        sent_by_me: false,
+    }), editability_types.NO);
+
+    // If the server returns the message with an error (e.g. due to
+    // malformed markdown), you can edit the message regardless of the realm
+    // message editing policy, since the message hasn't actually been sent yet
+    assert.equal(get_editability({
+        sent_by_me: true,
+        failed_request: true,
+    }), editability_types.FULL);
+
+    // Locally echoed messages are not editable, since the message hasn't
+    // finished being sent yet.
+    assert.equal(get_editability({
+        sent_by_me: true,
+        local_id: 25,
+    }), editability_types.NO);
+
+    // For the rest of these tests, we only consider messages sent by the
+    // user, and that were successfully sent (i.e. no failed_request or local_id)
+    var message = {
+        sent_by_me: true
+    };
+
+    global.page_params = {
+        realm_allow_message_editing: false
+    };
+    assert.equal(get_editability(message), editability_types.NO);
+
+    global.page_params = {
+        realm_allow_message_editing: true,
+        // Limit of 0 means no time limit on editing messages
+        realm_message_content_edit_limit_seconds: 0
+    };
+    assert.equal(get_editability(message), editability_types.FULL);
+
+    global.page_params = {
+        realm_allow_message_editing: true,
+        realm_message_content_edit_limit_seconds: 10
+    };
+    var now = new Date();
+    var current_timestamp = now/1000;
+    message.timestamp = current_timestamp - 60;
+    // Have 55+10 > 60 seconds from message.timestamp to edit the message; we're good!
+    assert.equal(get_editability(message, 55), editability_types.FULL);
+    // It's been 60 > 45+10 since message.timestamp. When realm_allow_message_editing
+    // is true, we can edit the topic if there is one.
+    message.type = 'stream';
+    assert.equal(get_editability(message, 45), editability_types.TOPIC_ONLY);
+    message.type = 'private';
+    assert.equal(get_editability(message, 45), editability_types.NO_LONGER);
+    // If we don't pass a second argument, treat it as 0
+    assert.equal(get_editability(message), editability_types.NO_LONGER);
+}());