gn: Fix some typos in unittests.

tools/gn/substitution_writer_unittest.cc

 // Copyright 2014 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 <sstream>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/err.h"
 #include "tools/gn/escape.h"
 #include "tools/gn/substitution_list.h"
@@ skipping 41 matching lines @@
   SubstitutionPattern pattern;
   Err err;
   ASSERT_TRUE(pattern.Parse("{{source_gen_dir}}/{{source_name_part}}.tmp",
                             NULL, &err));
 
   OutputFile result = SubstitutionWriter::ApplyPatternToSourceAsOutputFile(
       setup.settings(), pattern, SourceFile("//foo/bar/myfile.txt"));
   ASSERT_EQ("gen/foo/bar/myfile.tmp", result.value());
 }
 
-TEST(SubstutitionWriter, WriteNinjaVariablesForSource) {
+TEST(SubstitutionWriter, WriteNinjaVariablesForSource) {
   TestWithScope setup;
 
   std::vector<SubstitutionType> types;
   types.push_back(SUBSTITUTION_SOURCE);
   types.push_back(SUBSTITUTION_SOURCE_NAME_PART);
   types.push_back(SUBSTITUTION_SOURCE_DIR);
 
   EscapeOptions options;
   options.mode = ESCAPE_NONE;
 
@@ skipping 21 matching lines @@
   options.mode = ESCAPE_NONE;
 
   std::ostringstream out;
   SubstitutionWriter::WriteWithNinjaVariables(pattern, options, out);
 
   EXPECT_EQ(
       "-i ${in} --out=bar\"${source_name_part}\".o",
       out.str());
 }
 
-TEST(SubstutitionWriter, SourceSubstitutions) {
+TEST(SubstitutionWriter, SourceSubstitutions) {
   TestWithScope setup;
 
   // Call to get substitutions relative to the build dir.
   #define GetRelSubst(str, what) \
       SubstitutionWriter::GetSourceSubstitution( \
           setup.settings(), \
           SourceFile(str), \
           what, \
           SubstitutionWriter::OUTPUT_RELATIVE, \
           setup.settings()->build_settings()->build_dir())
@@ skipping 135 matching lines @@
   // Test that we handle paths that end up in the root build dir properly
   // (no leading "./" or "/").
   SubstitutionPattern pattern;
   ASSERT_TRUE(
       pattern.Parse("{{root_out_dir}}/{{target_output_name}}.so", NULL, &err));
 
   OutputFile output = SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
       &target, tool, pattern);
   EXPECT_EQ("./libbaz.so", output.value());
 }