fix repeatedly configured tutorial paths bug

Author: ShMcK

src/modules/tutorial/reducer.ts

@@ -11,6 +11,8 @@ const _tutorial: CR.Tutorial = {
   config: null,
 };
 
+const configured = [];
+
 export default function tutorialReducer(
   t = _tutorial, action: Action
 ): CR.Tutorial {
@@ -27,8 +29,11 @@ export default function tutorialReducer(
       const coderoadJsonPath = join(packagePath, packageJson.main);
       let {info, pages} = require(coderoadJsonPath);
 
-      // configure test paths to absolute paths
-      pages = configPaths(dir, name, config, pages || []);
+      // configure test paths to absolute paths. Only once.
+      if (configured.indexOf(name) === -1) {
+        pages = configPaths(dir, name, config, pages || []);
+      }
+      configured.push(name);
 
       // return tutorial (info, pages) & tutorial package.json
       return {

src/modules/tutorial/utils/config-paths.ts

@@ -6,18 +6,22 @@ function configTestString(
 ): string {
 
   if (isWindows) {
+    // adjust paths for windows slashes
     testPath = testPath.split('/').join('\\');
   }
 
+  // adjust absolute file path
   if (config.dir) {
     testPath = join(config.dir, testPath);
   } else {
     testPath = join(dir, 'node_modules', name, testPath);
   }
 
   if (config.testSuffix) {
+    // prevent repeat appending test suffix
     testPath += config.testSuffix;
   }
+
   return testPath;
 }