gn: Enforce braces after 'else'

tools/gn/parser_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <iostream>
 #include <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/parser.h"
@@ skipping 659 matching lines @@
   DoParserPrintTest(input, expected);
 }
 
 TEST(Parser, HangingIf) {
   DoParserErrorTest("if", 1, 1);
 }
 
 TEST(Parser, NegatingList) {
   DoParserErrorTest("executable(\"wee\") { sources =- [ \"foo.cc\" ] }", 1, 30);
 }
+
+TEST(Parser, ConditionNoBracesIf) {
+  DoParserErrorTest(
+      "if (true)\n"
+      "  foreach(foo, []) {}\n"
+      "else {\n"
+      "  foreach(bar, []) {}\n"
+      "}\n",
+      2, 3);
+}
+
+TEST(Parser, ConditionNoBracesElse) {
+  DoParserErrorTest(
+      "if (true) {\n"
+      "  foreach(foo, []) {}\n"
+      "} else\n"
+      "  foreach(bar, []) {}\n",
+      4, 3);
+}
+
+TEST(Parser, ConditionNoBracesElseIf) {
+  DoParserErrorTest(
+      "if (true) {\n"
+      "  foreach(foo, []) {}\n"
+      "} else if (true)\n"
+      "  foreach(bar, []) {}\n",
+      4, 3);
+}