test: add test

Author: y-hsgw

packages/eslint-plugin/tests/rules/no-unnecessary-type-parameters.test.ts

@@ -1792,6 +1792,52 @@ function join(els: (string & number)[]) {
     },
     {
       code: `
+function join<T extends (string & number) | boolean>(els: T[]) {
+  return els.map(el => '' + el).join(',');
+}
+      `,
+      errors: [
+        {
+          data: { descriptor: 'function', name: 'T', uses: 'used only once' },
+          messageId: 'sole',
+          suggestions: [
+            {
+              messageId: 'replaceUsagesWithConstraint',
+              output: `
+function join(els: ((string & number) | boolean)[]) {
+  return els.map(el => '' + el).join(',');
+}
+      `,
+            },
+          ],
+        },
+      ],
+    },
+    {
+      code: noFormat`
+function join<T extends (string | number)>(els: T[]) {
+  return els.map(el => '' + el).join(',');
+}
+      `,
+      errors: [
+        {
+          data: { descriptor: 'function', name: 'T', uses: 'used only once' },
+          messageId: 'sole',
+          suggestions: [
+            {
+              messageId: 'replaceUsagesWithConstraint',
+              output: `
+function join(els: (string | number)[]) {
+  return els.map(el => '' + el).join(',');
+}
+      `,
+            },
+          ],
+        },
+      ],
+    },
+    {
+      code: `
 function join<T extends { hoge: string } | { hoge: number }>(els: T['hoge'][]) {
   return els.map(el => '' + el).join(',');
 }