Extra tests for #2339

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mege-consecutive-scopes-dont-merge-with-different-deps.expect.md

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+
+## Input
+
+```javascript
+const { getNumber, identity } = require("shared-runtime");
+
+function Component(props) {
+  // Two scopes: one for `getNumber()`, one for the object literal.
+  // Neither has dependencies so they should merge
+  return { a: getNumber(), b: identity(props.id), c: ["static"] };
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ id: 42 }],
+};
+
+```
+
+## Code
+
+```javascript
+import { unstable_useMemoCache as useMemoCache } from "react";
+const { getNumber, identity } = require("shared-runtime");
+
+function Component(props) {
+  const $ = useMemoCache(6);
+  let t0;
+  if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
+    t0 = getNumber();
+    $[0] = t0;
+  } else {
+    t0 = $[0];
+  }
+  let t1;
+  if ($[1] !== props.id) {
+    t1 = identity(props.id);
+    $[1] = props.id;
+    $[2] = t1;
+  } else {
+    t1 = $[2];
+  }
+  let t2;
+  if ($[3] === Symbol.for("react.memo_cache_sentinel")) {
+    t2 = ["static"];
+    $[3] = t2;
+  } else {
+    t2 = $[3];
+  }
+  let t3;
+  if ($[4] !== t1) {
+    t3 = { a: t0, b: t1, c: t2 };
+    $[4] = t1;
+    $[5] = t3;
+  } else {
+    t3 = $[5];
+  }
+  return t3;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ id: 42 }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/mege-consecutive-scopes-dont-merge-with-different-deps.js

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+const { getNumber, identity } = require("shared-runtime");
+
+function Component(props) {
+  // Two scopes: one for `getNumber()`, one for the object literal.
+  // Neither has dependencies so they should merge
+  return { a: getNumber(), b: identity(props.id), c: ["static"] };
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ id: 42 }],
+};

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/merge-consecutive-nested-scopes.expect.md

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+
+## Input
+
+```javascript
+const { getNumber } = require("shared-runtime");
+
+function Component(props) {
+  let x;
+  // Two scopes: one for `getNumber()`, one for the object literal.
+  // Neither has dependencies so they should merge
+  if (props.cond) {
+    x = { session_id: getNumber() };
+  }
+  return x;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ cond: true }],
+};
+
+```
+
+## Code
+
+```javascript
+import { unstable_useMemoCache as useMemoCache } from "react";
+const { getNumber } = require("shared-runtime");
+
+function Component(props) {
+  const $ = useMemoCache(1);
+  let x;
+  if (props.cond) {
+    let t0;
+    if ($[0] === Symbol.for("react.memo_cache_sentinel")) {
+      t0 = { session_id: getNumber() };
+      $[0] = t0;
+    } else {
+      t0 = $[0];
+    }
+    x = t0;
+  }
+  return x;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ cond: true }],
+};
+
+```
+      

compiler/packages/babel-plugin-react-forget/src/__tests__/fixtures/compiler/merge-consecutive-nested-scopes.js

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+const { getNumber } = require("shared-runtime");
+
+function Component(props) {
+  let x;
+  // Two scopes: one for `getNumber()`, one for the object literal.
+  // Neither has dependencies so they should merge
+  if (props.cond) {
+    x = { session_id: getNumber() };
+  }
+  return x;
+}
+
+export const FIXTURE_ENTRYPOINT = {
+  fn: Component,
+  params: [{ cond: true }],
+};