[StdlibUnittest] Warn if no tests were executed

ktoso · tshortli · commit cb7bc98931d7 · 2025-07-02T22:14:56.000-07:00
diff --git a/stdlib/private/StdlibUnittest/StdlibUnittest.swift b/stdlib/private/StdlibUnittest/StdlibUnittest.swift
@@ -1608,6 +1608,9 @@ class _ParentProcess {
         _testSuiteFailedCallback()
       } else {
         print("\(testSuite.name): All tests passed")
+        if testSuite._tests.isEmpty {
+          print("WARNING: SUITE '\(testSuite.name)' CONTAINED NO TESTS! NO TESTS WERE EXECUTED!")
+        }
       }
     }
     let (failed: failedOnShutdown, ()) = _shutdownChild()

Original file line number	Diff line number	Diff line change
`@@ -1608,6 +1608,9 @@ class _ParentProcess {`
`1608`	`1608`	`_testSuiteFailedCallback()`
`1609`	`1609`	`} else {`
`1610`	`1610`	`print("\(testSuite.name): All tests passed")`
	`1611`	`+ if testSuite._tests.isEmpty {`
	`1612`	`+ print("WARNING: SUITE '\(testSuite.name)' CONTAINED NO TESTS! NO TESTS WERE EXECUTED!")`
	`1613`	`+ }`
`1611`	`1614`	`}`
`1612`	`1615`	`}`
`1613`	`1616`	`let (failed: failedOnShutdown, ()) = _shutdownChild()`