add tests for edge cases

Author: mizdra

packages/ts-plugin/e2e/named-exports.test.ts

@@ -211,6 +211,10 @@ describe('supports completions', async () => {
     'a.module.css': dedent`
       .a_1 { color: red; }
     `,
+    // The tokens exported from following definition file should be ignored.
+    'generated/a.module.css.d.ts': dedent`
+      export const a_1: string;
+    `,
   });
   describe('default behavior', async () => {
     const iff = await baseIff.fork({
@@ -318,9 +322,17 @@ describe('supports code fixes', async () => {
     'a.module.css': dedent`
       .a_1 { color: red; }
     `,
+    // The tokens exported from following definition file should be ignored.
+    'generated/a.module.css.d.ts': dedent`
+      export const a_1: string;
+    `,
   });
   describe('default behavior', async () => {
     const iff = await baseIff.fork({
+      'import-statement-already-exists.ts': dedent`
+        import { a_1 } from './a.module.css';
+        styles;
+      `,
       'tsconfig.json': dedent`
         {
           "cmkOptions": {
@@ -335,7 +347,7 @@ describe('supports code fixes', async () => {
     });
     test.each([
       {
-        name: 'styles',
+        name: 'styles in index.ts',
         file: iff.paths['index.ts'],
         startLine: 1,
         startOffset: 1,
@@ -360,14 +372,40 @@ describe('supports code fixes', async () => {
         ],
       },
       {
-        name: 'a_1',
+        name: 'a_1 in index.ts',
         file: iff.paths['index.ts'],
         startLine: 2,
         startOffset: 1,
         endLine: 2,
         endOffset: 4,
         expected: [],
       },
+      // MEMO: css-modules-kit does not support the following case to simplify the implementation.
+      // {
+      //   name: 'styles in import-statement-already-exists.ts',
+      //   file: iff.paths['import-statement-already-exists.ts'],
+      //   startLine: 2,
+      //   startOffset: 1,
+      //   endLine: 2,
+      //   endOffset: 7,
+      //   expected: [
+      //     {
+      //       fixName: 'import',
+      //       changes: [
+      //         {
+      //           fileName: formatPath(iff.paths['import-statement-already-exists.ts']),
+      //           textChanges: [
+      //             {
+      //               start: { line: 1, offset: 1 },
+      //               end: { line: 1, offset: 1 },
+      //               newText: `import * as styles from "./a.module.css";${ts.sys.newLine}${ts.sys.newLine}`,
+      //             },
+      //           ],
+      //         },
+      //       ],
+      //     },
+      //   ],
+      // },
     ])('$name', async ({ file, startLine, startOffset, endLine, endOffset, expected }) => {
       const res = await tsserver.sendGetCodeFixes({
         errorCodes: [2304],