LibCore: Implement four-digit modes for `FilePermissionsMask` parsing

1 files changed, 21 insertions, 0 deletions

diff --git a/Tests/LibCore/TestLibCoreFilePermissionsMask.cpp b/Tests/LibCore/TestLibCoreFilePermissionsMask.cpp
index 1dc303c0c6..55f300be5f 100644
--- a/Tests/LibCore/TestLibCoreFilePermissionsMask.cpp
+++ b/Tests/LibCore/TestLibCoreFilePermissionsMask.cpp
@@ -116,3 +116,24 @@ TEST_CASE(file_permission_mask_parse)
     mask = Core::FilePermissionsMask::parse("z+rw"sv);
     EXPECT(mask.is_error());
 }
+
+TEST_CASE(numeric_mask_special_bits)
+{
+    {
+        auto mask = Core::FilePermissionsMask::parse("750"sv);
+        EXPECT(!mask.is_error());
+        EXPECT_EQ(mask.value().apply(07000), 07750);
+    }
+
+    {
+        auto mask = Core::FilePermissionsMask::parse("7750"sv);
+        EXPECT(!mask.is_error());
+        EXPECT_EQ(mask.value().apply(0), 07750);
+    }
+
+    {
+        auto mask = Core::FilePermissionsMask::parse("0750"sv);
+        EXPECT(!mask.is_error());
+        EXPECT_EQ(mask.value().apply(07000), 0750);
+    }
+}