Convert pub tests to line doc comments.

utils/tests/pub/version_solver_test.dart

Index: utils/tests/pub/version_solver_test.dart
diff --git a/utils/tests/pub/version_solver_test.dart b/utils/tests/pub/version_solver_test.dart
index 6c0626f6573bc06350de06d7bc79f4b27e61a834..eb49d3d8236a50ad596cf8265e9e76e64d8107f8 100644
--- a/utils/tests/pub/version_solver_test.dart
+++ b/utils/tests/pub/version_solver_test.dart
@@ -461,14 +461,13 @@ testResolve(description, packages, {lockfile, result, Matcher error}) {
   });
 }
 
-/**
- * A source used for testing. This both creates mock package objects and acts as
- * a source for them.
- *
- * In order to support testing packages that have the same name but different
- * descriptions, a package's name is calculated by taking the description string
- * and stripping off any trailing hyphen followed by non-hyphen characters.
- */
+/// A source used for testing. This both creates mock package objects and acts
+/// as a source for them.
+///
+/// In order to support testing packages that have the same name but different
+/// descriptions, a package's name is calculated by taking the description
+/// string and stripping off any trailing hyphen followed by non-hyphen
+/// characters.
 class MockSource extends Source {
   final Map<String, Map<Version, Package>> _packages;
 
@@ -515,10 +514,8 @@ class MockSource extends Source {
   }
 }
 
-/**
- * A source used for testing that doesn't natively understand versioning,
- * similar to how the Git and SDK sources work.
- */
+/// A source used for testing that doesn't natively understand versioning,
+/// similar to how the Git and SDK sources work.
 class MockVersionlessSource extends Source {
   final Map<String, Package> _packages;