Clarify logic around the entry-point bailouts in swift test

Author: grynspan

Sources/Commands/SwiftTestCommand.swift

@@ -325,9 +325,10 @@ public struct SwiftTestCommand: AsyncSwiftCommand {
 
         // Run Swift Testing (parallel or not, it has a single entry point.)
         if options.testLibraryOptions.isEnabled(.swiftTesting) {
-            if options.testLibraryOptions.isExplicitlyEnabled(.swiftTesting) != true,
-               let testEntryPointPath = testProducts.lazy.compactMap(\.testEntryPointPath).first {
-                // Cannot run Swift Testing because an entry point file was used.
+            if let testEntryPointPath = testProducts.lazy.compactMap(\.testEntryPointPath).first,
+               options.testLibraryOptions.isExplicitlyEnabled(.swiftTesting) == nil {
+                // Cannot run Swift Testing because an entry point file was used, and the developer
+                // didn't explicitly enable Swift Testing.
                 swiftCommandState.observabilityScope.emit(
                     debug: "Skipping automatic Swift Testing invocation because a test entry point path is present: \(testEntryPointPath)"
                 )
@@ -733,9 +734,10 @@ extension SwiftTestCommand {
             }
 
             if testLibraryOptions.isEnabled(.swiftTesting) {
-                if testLibraryOptions.isExplicitlyEnabled(.swiftTesting) != true,
-                   let testEntryPointPath = testProducts.lazy.compactMap(\.testEntryPointPath).first {
-                    // Cannot run Swift Testing because an entry point file was used.
+                if let testEntryPointPath = testProducts.lazy.compactMap(\.testEntryPointPath).first,
+                   testLibraryOptions.isExplicitlyEnabled(.swiftTesting) == nil {
+                    // Cannot run Swift Testing because an entry point file was used, and the developer
+                    // didn't explicitly enable Swift Testing.
                     swiftCommandState.observabilityScope.emit(
                         debug: "Skipping automatic Swift Testing invocation (list) because a test entry point path is present: \(testEntryPointPath)"
                     )