Add regression test for #46192 (#49057)

src/harness/fourslashInterfaceImpl.ts

@@ -404,8 +404,8 @@ namespace FourSlashInterface {
             this.state.baselineSignatureHelp();
         }
 
-        public baselineCompletions() {
-            this.state.baselineCompletions();
+        public baselineCompletions(preferences?: ts.UserPreferences) {
+            this.state.baselineCompletions(preferences);
         }
 
         public baselineSmartSelection() {

tests/cases/fourslash/autoImportPathsAliasesAndBarrels.ts

@@ -0,0 +1,59 @@
+/// <reference path="fourslash.ts" />
+
+// @Filename: /tsconfig.json
+//// {
+////  "compilerOptions": {
+////    "module": "commonjs",
+////    "paths": {
+////      "~/*": ["src/*"]  
+////    }
+////  }
+////}
+
+// @Filename: /src/dirA/index.ts
+//// export * from "./thing1A";
+//// export * from "./thing2A";
+
+// @Filename: /src/dirA/thing1A.ts
+//// export class Thing1A {}
+//// Thing/**/
+
+// @Filename: /src/dirA/thing2A.ts
+//// export class Thing2A {}
+
+// @Filename: /src/dirB/index.ts
+//// export * from "./thing1B";
+//// export * from "./thing2B";
+
+// @Filename: /src/dirB/thing1B.ts
+//// export class Thing1B {}
+
+// @Filename: /src/dirB/thing2B.ts
+//// export class Thing2B {}
+
+verify.completions({
+  marker: "",
+  includes: [{
+    name: "Thing2A",
+    source: "./thing2A",
+    sourceDisplay: "./thing2A",
+    hasAction: true,
+    sortText: completion.SortText.AutoImportSuggestions,
+  }, {
+    name: "Thing1B",
+    source: "~/dirB",
+    sourceDisplay: "~/dirB",
+    hasAction: true,
+    sortText: completion.SortText.AutoImportSuggestions,
+  }, {
+    name: "Thing2B",
+    source: "~/dirB",
+    sourceDisplay: "~/dirB",
+    hasAction: true,
+    sortText: completion.SortText.AutoImportSuggestions,
+  }],
+  preferences: {
+    includeCompletionsForModuleExports: true,
+    allowIncompleteCompletions: true,
+  },
+});

tests/cases/fourslash/fourslash.ts

@@ -349,7 +349,7 @@ declare namespace FourSlashInterface {
         baselineSyntacticDiagnostics(): void;
         baselineSyntacticAndSemanticDiagnostics(): void;
         getEmitOutput(expectedOutputFiles: ReadonlyArray<string>): void;
-        baselineCompletions(): void;
+        baselineCompletions(preferences?: UserPreferences): void;
         baselineQuickInfo(): void;
         baselineSmartSelection(): void;
         baselineSignatureHelp(): void;