fix(test): make tests pass in Italian locale

If the system is in an Italian locale (or perhaps Brazilian or other
locales), some test_file tests fail:

    test-file.cpp:79: Failure
    Value of: file_content.error().to_string()
    Expected: (has substring "No such file") or (has substring "cannot find")
      Actual: "failed to read from /tmp/quick-lint-js.3SzKMa/does-not-exist.js: File o directory non esistente"
    [  FAILED  ] test_file.read_non_existing_file (0 ms)
    test-file.cpp:91: Failure
    Value of: file_content.error().to_string()
    Expected: (has substring "Is a directory") or (has substring "Access is denied")
      Actual: "failed to read from /tmp/quick-lint-js.1PkP4o: \xC3\x88 una directory"
        As Text: "failed to read from /tmp/quick-lint-js.1PkP4o: È una directory"
    [  FAILED  ] test_file.read_directory (0 ms)

Fix these tests by checking error codes instead of strings.

This patch should address the following issues:

* #751
* #80

Author: strager

docs/CHANGELOG.md

@@ -32,6 +32,7 @@ Semantic Versioning.
   as the use of a variable called `async` followed by a non-async function, per
   the language standard.
 * `((x)) => {}` no longer crashes the parser with an assertion failure.
+* Tests now pass if the user's locale is Italian (`it_IT.utf8` on Linux).
 
 ## 2.5.0 (2022-05-23)
 

test/test-file.cpp

@@ -33,6 +33,10 @@
 #include <type_traits>
 #include <vector>
 
+#if QLJS_HAVE_WINDOWS_H
+#include <quick-lint-js/windows.h>
+#endif
+
 #if QLJS_HAVE_MKFIFO
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -76,8 +80,13 @@ TEST_F(test_file, read_non_existing_file) {
   EXPECT_FALSE(file_content.ok());
   EXPECT_TRUE(file_content.error().is_file_not_found_error());
   EXPECT_THAT(file_content.error().to_string(), HasSubstr("does-not-exist.js"));
-  EXPECT_THAT(file_content.error().to_string(),
-              AnyOf(HasSubstr("No such file"), HasSubstr("cannot find")));
+#if QLJS_HAVE_UNISTD_H
+  EXPECT_EQ(file_content.error().io_error.error, ENOENT);
+#elif QLJS_HAVE_WINDOWS_H
+  EXPECT_EQ(file_content.error().io_error.error, ERROR_FILE_NOT_FOUND);
+#else
+#error "Unknown platform"
+#endif
 }
 
 TEST_F(test_file, read_directory) {
@@ -88,12 +97,13 @@ TEST_F(test_file, read_directory) {
   EXPECT_FALSE(file_content.ok());
   EXPECT_FALSE(file_content.error().is_file_not_found_error());
   EXPECT_THAT(file_content.error().to_string(), HasSubstr(temp_file_path));
-  EXPECT_THAT(
-      file_content.error().to_string(),
-      testing::AnyOf(
-          HasSubstr("Is a directory"),
-          HasSubstr("Access is denied")  // TODO(strager): Improve this message.
-          ));
+#if QLJS_HAVE_UNISTD_H
+  EXPECT_EQ(file_content.error().io_error.error, EISDIR);
+#elif QLJS_HAVE_WINDOWS_H
+  EXPECT_EQ(file_content.error().io_error.error, ERROR_ACCESS_DENIED);
+#else
+#error "Unknown platform"
+#endif
 }
 
 #if QLJS_HAVE_MKFIFO