test: tighten module run source resolution coverage

modules/nextflow/src/main/groovy/nextflow/cli/module/CmdModuleRun.groovy

@@ -56,33 +56,35 @@ class CmdModuleRun extends CmdRun {
 
     @Override
     void run() {
+        final moduleFile = resolveModuleSource()
+        if( moduleFile ) {
+            args[0] = moduleFile.toAbsolutePath().toString()
+            super.run()
+        }
+    }
+
+    protected Path resolveModuleSource() {
         if( !args ) {
             throw new AbortOperationException("Module name/path not provided")
         }
-
-        final moduleFile = isLocalModule(args[0])
+        return isLocalModule(args[0])
             ? resolveLocalModule(args[0])
             : resolveRemoteModule(args[0], version)
-
-        if( moduleFile ) {
-            args[0] = moduleFile.toAbsolutePath().toString()
-            super.run()
-        }
     }
 
     private boolean isLocalModule(String str) {
         return str.startsWith('/') || str.startsWith('./') || str.startsWith('../')
     }
 
-    private Path resolveLocalModule(String str) {
+    protected Path resolveLocalModule(String str) {
         final module = Path.of(str).toAbsolutePath().normalize()
         final path = module.isDirectory() ? module.resolve(Const.DEFAULT_MAIN_FILE_NAME) : module
         if( !path.exists() )
             throw new AbortOperationException("Invalid module path: ${str}")
         return path
     }
 
-    private Path resolveRemoteModule(String name, String version) {
+    protected Path resolveRemoteModule(String name, String version) {
         // Parse and validate module reference
         ModuleReference reference
         try {