Add the ability to generate multiple test cases

Summary: Modify test generation script to be able to generate multiple test cases

Reviewed By: lucasr

Differential Revision: D3714577

fbshipit-source-id: d2bc2155712f946c5a24231a9532d2acc097524c

README.md

@@ -111,7 +111,7 @@ Instead of manually writing a test which ensures parity with web implementations
 </div>
 ```
 
-Once saving and exiting the editor window the script will open a browser window. From here open the developer console and you should see that the web page has output a test file. Copy this into a file and save it in the `tests` folder. Re-run `buck test //:CSSLayout` to validate the behavior.
+Once saving and exiting the editor window the script will open a browser window. From here open the developer console and you should see that the web page has output a test file. Copy this into a file and save it in the `tests` folder. Re-run `buck test //:CSSLayout` to validate the behavior. One test case will be generated for every root `div` in the input html.
 
 ### Benchmarks
 Benchmarks are located in `benchmarks/CSSBenchmark.c` and can be run with `buck run //:benchmark`. If you think your change has affected performance please run this before and after your change to validate that nothing has regressed.

gentest/gentest.js

@@ -8,10 +8,10 @@
  */
 
 window.onload = function() {
- printTest("INSERT_NAME_HERE", calculateTree(document.body.children[0]));
+ printTest(calculateTree(document.body.children[0]));
 }
 
-function printTest(testName, layoutTree) {
+function printTest(layoutTree) {
   var lines = [
     '/**',
     ' * Copyright (c) 2014-present, Facebook, Inc.',
@@ -26,22 +26,25 @@ function printTest(testName, layoutTree) {
     '#include <CSSLayoutTestUtils/CSSLayoutTestUtils.h>',
     '#include <gtest/gtest.h>',
     '',
-    'TEST(CSSLayoutTest, ' + testName + ') {',
   ];
 
-  lines.push('  ' + setupTestTree(layoutTree[0], 'root', null).reduce(function(curr, prev) {
-    return curr + '\n  ' + prev;
-  }));
+  for (var i = 0; i < layoutTree.length - 1; i++) {
+    lines.push('TEST(CSSLayoutTest, INSERT_NAME_HERE) {');
 
-  lines.push('  CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);');
-  lines.push('');
+    lines.push('  ' + setupTestTree(layoutTree[i], 'root', null).reduce(function(curr, prev) {
+      return curr + '\n  ' + prev;
+    }));
 
-  lines.push('  ' + assertTestTree(layoutTree[0], 'root', null).reduce(function(curr, prev) {
-    return curr + '\n  ' + prev;
-  }));
+    lines.push('  CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);');
+    lines.push('');
 
-  lines.push('}');
-  lines.push('');
+    lines.push('  ' + assertTestTree(layoutTree[i], 'root', null).reduce(function(curr, prev) {
+      return curr + '\n  ' + prev;
+    }));
+
+    lines.push('}');
+    lines.push('');
+  }
 
   printLines(lines);
 }