Move tests regarding redundant imports to the unnecessary_import_test file

Work towards https://github.com/dart-lang/sdk/issues/61877

Implementing comments from https://dart-review.googlesource.com/c/sdk/+/458600

Change-Id: I0c13fa154cadc207dca3c7d477e8c34cb53c2cd9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/459840
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Samuel Rawlins <srawlins@google.com>
diff --git a/pkg/analyzer/test/src/diagnostics/unnecessary_import_test.dart b/pkg/analyzer/test/src/diagnostics/unnecessary_import_test.dart
index b058e19..a93c811 100644
--- a/pkg/analyzer/test/src/diagnostics/unnecessary_import_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/unnecessary_import_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/src/error/codes.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../dart/resolution/context_collection_resolution.dart';
@@ -184,6 +185,35 @@
 ''');
   }
 
+  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/61877')
+  test_library_export_and_export() async {
+    var a = newFile('$testPackageLibPath/a.dart', r'''
+class C {}
+''');
+
+    var b = newFile('$testPackageLibPath/b.dart', r'''
+export 'a.dart';
+''');
+
+    var c = newFile('$testPackageLibPath/c.dart', r'''
+export 'a.dart';
+''');
+
+    var d = newFile('$testPackageLibPath/d.dart', r'''
+import 'b.dart';
+import 'c.dart';
+
+method() => C();
+''');
+    await assertErrorsInFile2(a, []);
+    await assertErrorsInFile2(b, []);
+    await assertErrorsInFile2(c, []);
+    // Import of 'c.dart' is not marked as unused even though it could be
+    // removed.
+    var result = await resolveFile(d);
+    expect(result.diagnostics, isNotEmpty);
+  }
+
   test_library_extension_equalPrefixes_unnecessary() async {
     newFile('$testPackageLibPath/lib1.dart', '''
 extension E1 on int {
@@ -357,6 +387,30 @@
 ''');
   }
 
+  @FailingTest(issue: 'https://github.com/dart-lang/sdk/issues/61877')
+  test_library_import_and_export() async {
+    var a = newFile('$testPackageLibPath/a.dart', r'''
+class C {}
+''');
+
+    var b = newFile('$testPackageLibPath/b.dart', r'''
+export 'a.dart';
+''');
+
+    var c = newFile('$testPackageLibPath/c.dart', r'''
+import 'a.dart';
+import 'b.dart';
+
+method() => C();
+''');
+    await assertErrorsInFile2(a, []);
+    await assertErrorsInFile2(b, []);
+    // Import of 'b.dart' is not marked as unused even though it could be
+    // removed.
+    var result = await resolveFile(c);
+    expect(result.diagnostics, isNotEmpty);
+  }
+
   test_library_systemShadowing() async {
     newFile('$testPackageLibPath/lib1.dart', '''
 class File {}
diff --git a/pkg/analyzer/test/src/diagnostics/unused_import_test.dart b/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
index 8036a43..521ad1e 100644
--- a/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
+++ b/pkg/analyzer/test/src/diagnostics/unused_import_test.dart
@@ -65,33 +65,6 @@
 ''');
   }
 
-  test_library_export_and_export() async {
-    var a = newFile('$testPackageLibPath/a.dart', r'''
-class C {}
-''');
-
-    var b = newFile('$testPackageLibPath/b.dart', r'''
-export 'a.dart';
-''');
-
-    var c = newFile('$testPackageLibPath/c.dart', r'''
-export 'a.dart';
-''');
-
-    var d = newFile('$testPackageLibPath/d.dart', r'''
-import 'b.dart';
-import 'c.dart';
-
-method() => C();
-''');
-    await assertErrorsInFile2(a, []);
-    await assertErrorsInFile2(b, []);
-    await assertErrorsInFile2(c, []);
-    // Import of 'c.dart' is not marked as unused even though it could be
-    // removed.
-    await assertErrorsInFile2(d, []);
-  }
-
   test_library_export_infiniteLoop() async {
     newFile('$testPackageLibPath/lib1.dart', r'''
 export 'lib2.dart';
@@ -360,28 +333,6 @@
     );
   }
 
-  test_library_import_and_export() async {
-    var a = newFile('$testPackageLibPath/a.dart', r'''
-class C {}
-''');
-
-    var b = newFile('$testPackageLibPath/b.dart', r'''
-export 'a.dart';
-''');
-
-    var c = newFile('$testPackageLibPath/c.dart', r'''
-import 'a.dart';
-import 'b.dart';
-
-method() => C();
-''');
-    await assertErrorsInFile2(a, []);
-    await assertErrorsInFile2(b, []);
-    // Import of 'b.dart' is not marked as unused even though it could be
-    // removed.
-    await assertErrorsInFile2(c, []);
-  }
-
   test_library_inComment_libraryDirective() async {
     await assertNoErrorsInCode(r'''
 /// Use [Future] class.