1 files changed, 21 insertions, 0 deletions
diff --git a/src/mongo/db/ftdc/util_test.cpp b/src/mongo/db/ftdc/util_test.cpp
index aa99006c73a..0adf0f73c15 100644
--- a/src/mongo/db/ftdc/util_test.cpp
+++ b/src/mongo/db/ftdc/util_test.cpp
@@ -46,4 +46,25 @@ TEST(FTDCUtilTest, TestRoundTime) {
     checkTime(14, 13, 7);
 }
 
+// Validate the MongoS FTDC path is computed correctly from a log file path.
+TEST(FTDCUtilTest, TestMongoSPath) {
+
+    std::vector<std::pair<std::string, std::string>> testCases = {
+        {"/var/log/mongos.log", "/var/log/mongos.diagnostic.data"},
+        {"/var/log/mongos.foo.log", "/var/log/mongos.diagnostic.data"},
+        {"/var/log/log_file", "/var/log/log_file.diagnostic.data"},
+        {"./mongos.log", "./mongos.diagnostic.data"},
+        {"../mongos.log", "../mongos.diagnostic.data"},
+        {"c:\\var\\log\\mongos.log", "c:\\var\\log\\mongos.diagnostic.data"},
+        {"c:\\var\\log\\mongos.foo.log", "c:\\var\\log\\mongos.diagnostic.data"},
+        {"c:\\var\\log\\log_file", "c:\\var\\log\\log_file.diagnostic.data"},
+        {"/var/some.log/mongos.log", "/var/some.log/mongos.diagnostic.data"},
+        {"/var/some.log/log_file", "/var/some.log/log_file.diagnostic.data"},
+    };
+
+    for (const auto& p : testCases) {
+        ASSERT_EQUALS(FTDCUtil::getMongoSPath(p.first), p.second);
+    }
+}
+
 }  // namespace mongo