gentest support for position: static + initial test

Summary:
I am about to embark on supporting `position: static` in Yoga. The enum exists already (and is the default position type, lol) but does not actually do anything and just behaves like `position: relative`.

My approach here is to write a bunch of tests to test for the various behaviors of static positions and then develop on Yoga afterwards to get those tests passing. To do this, we need to make a few changes to the gentest files as there is not support for adding `position: static` at the moment:

* Make it so that the gentest code can physically write `YGPositionTypeStatic` if it encounters `position: static` in the style
* Make it so that gentest.js knows that Yoga's default is actually static. This way the code generated in the tests will actually label nodes for non default values
* Explicitly label the position type even when it is not declared in the style prop (with the exception of the default)
* Regenerate all the tests

Additionally I added the first, basic test: making sure insets do nothing on a statically positioned element.

Reviewed By: NickGerleman

Differential Revision: D50437855

fbshipit-source-id: 0e8bbf1c224d477ea4592b7563d0b70d2ffa79c8

javascript/tests/generated/YGStaticPositionTest.test.ts

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// @generated by gentest/gentest.rb from gentest/fixtures/YGStaticPositionTest.html
+
+import {Yoga} from "../tools/globals";
+import {
+  Align,
+  Direction,
+  Display,
+  Edge,
+  Errata,
+  ExperimentalFeature,
+  FlexDirection,
+  Gutter,
+  Justify,
+  MeasureMode,
+  Overflow,
+  PositionType,
+  Unit,
+  Wrap,
+} from 'yoga-layout';
+
+test.skip('static_position_insets_have_no_effect', () => {
+  const config = Yoga.Config.create();
+  let root;
+
+  config.setExperimentalFeatureEnabled(ExperimentalFeature.AbsolutePercentageAgainstPaddingEdge, true);
+
+  try {
+    root = Yoga.Node.create(config);
+    root.setPosition(Edge.Left, 50);
+    root.setPosition(Edge.Top, 50);
+    root.setWidth(100);
+    root.setHeight(100);
+    root.calculateLayout(undefined, undefined, Direction.LTR);
+
+    expect(root.getComputedLeft()).toBe(0);
+    expect(root.getComputedTop()).toBe(0);
+    expect(root.getComputedWidth()).toBe(100);
+    expect(root.getComputedHeight()).toBe(100);
+
+    root.calculateLayout(undefined, undefined, Direction.RTL);
+
+    expect(root.getComputedLeft()).toBe(0);
+    expect(root.getComputedTop()).toBe(0);
+    expect(root.getComputedWidth()).toBe(100);
+    expect(root.getComputedHeight()).toBe(100);
+  } finally {
+    if (typeof root !== 'undefined') {
+      root.freeRecursive();
+    }
+
+    config.free();
+  }
+});