test: convert inline private method tests to fixture-based tests

Move 14 inline tests from private-method-transform.spec.ts into
fixture directories under fixtures/private-methods/, and remove 2
redundant tests already covered by existing fixtures.

Made-with: Cursor

Author: a-chabot

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/async-private-method/actual.js

@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+export default class Test extends LightningElement {
+    async #fetchData() {
+        return await Promise.resolve(42);
+    }
+}

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/async-private-method/error.json

@@ -0,0 +1,14 @@
+import _tmpl from "./test.html";
+import { LightningElement, registerComponent as _registerComponent } from 'lwc';
+class Test extends LightningElement {
+  async #fetchData() {
+    return await Promise.resolve(42);
+  }
+  /*LWC compiler vX.X.X*/
+}
+const __lwc_component_class_internal = _registerComponent(Test, {
+  tmpl: _tmpl,
+  sel: "lwc-test",
+  apiVersion: 9999999
+});
+export default __lwc_component_class_internal;

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/async-private-method/expected.js

@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+export default class Test extends LightningElement {
+    #greet(name = 'world', times = 3) {
+        return name.repeat(times);
+    }
+}

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/default-parameter-values/actual.js

@@ -0,0 +1,14 @@
+import _tmpl from "./test.html";
+import { LightningElement, registerComponent as _registerComponent } from 'lwc';
+class Test extends LightningElement {
+  #greet(name = 'world', times = 3) {
+    return name.repeat(times);
+  }
+  /*LWC compiler vX.X.X*/
+}
+const __lwc_component_class_internal = _registerComponent(Test, {
+  tmpl: _tmpl,
+  sel: "lwc-test",
+  apiVersion: 9999999
+});
+export default __lwc_component_class_internal;

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/default-parameter-values/error.json

@@ -0,0 +1,6 @@
+import { LightningElement } from 'lwc';
+export default class Test extends LightningElement {
+    #process({ x, y }, [a, b]) {
+        return x + y + a + b;
+    }
+}

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/default-parameter-values/expected.js

@@ -0,0 +1,17 @@
+import _tmpl from "./test.html";
+import { LightningElement, registerComponent as _registerComponent } from 'lwc';
+class Test extends LightningElement {
+  #process({
+    x,
+    y
+  }, [a, b]) {
+    return x + y + a + b;
+  }
+  /*LWC compiler vX.X.X*/
+}
+const __lwc_component_class_internal = _registerComponent(Test, {
+  tmpl: _tmpl,
+  sel: "lwc-test",
+  apiVersion: 9999999
+});
+export default __lwc_component_class_internal;

packages/@lwc/babel-plugin-component/src/__tests__/fixtures/private-methods/destructuring-parameters/actual.js

@@ -0,0 +1,4 @@
+import { LightningElement } from 'lwc';
+export default class Test extends LightningElement {
+    #noop() {}
+}