style: use "map/where" instead of "for" loop

test/diff_test.dart

@@ -313,7 +313,7 @@ index e69de29..c217c63 100644
       expect(patches.length, 8);
       expect(patches.first.delta.status, GitDelta.deleted);
 
-      for (var p in patches) {
+      for (final p in patches) {
         p.free();
       }
       diff.free();

test/features_test.dart

@@ -6,7 +6,7 @@ void main() {
     test('returns list of compile time options for libgit2', () {
       expect(
         Features.list,
-        [GitFeature.threads, GitFeature.https, GitFeature.ssh, GitFeature.nsec],
+        {GitFeature.threads, GitFeature.https, GitFeature.ssh, GitFeature.nsec},
       );
     });
   });

test/mailmap_test.dart

@@ -148,7 +148,7 @@ Santa Claus <santa.claus@northpole.xx> <me@company.xx>
       final mailmap = Mailmap.fromBuffer(testMailmap);
       expect(mailmap, isA<Mailmap>());
 
-      for (var entry in testResolve) {
+      for (final entry in testResolve) {
         expect(
           mailmap.resolve(name: entry['name']!, email: entry['email']!),
           [entry['realName'], entry['realEmail']],
@@ -162,7 +162,7 @@ Santa Claus <santa.claus@northpole.xx> <me@company.xx>
       final mailmap = Mailmap.fromRepository(repo);
       expect(mailmap, isA<Mailmap>());
 
-      for (var entry in testResolve) {
+      for (final entry in testResolve) {
         expect(
           mailmap.resolve(name: entry['name']!, email: entry['email']!),
           [entry['realName'], entry['realEmail']],
@@ -175,7 +175,7 @@ Santa Claus <santa.claus@northpole.xx> <me@company.xx>
     test('successfully resolves names and emails when mailmap is empty', () {
       final mailmap = Mailmap.empty();
 
-      for (var entry in testResolve) {
+      for (final entry in testResolve) {
         expect(
           mailmap.resolve(name: entry['name']!, email: entry['email']!),
           [entry['name'], entry['email']],
@@ -188,7 +188,7 @@ Santa Claus <santa.claus@northpole.xx> <me@company.xx>
     test('successfully adds entries and resolves them', () {
       final mailmap = Mailmap.empty();
 
-      for (var entry in testEntries) {
+      for (final entry in testEntries) {
         mailmap.addEntry(
           realName: entry['realName'],
           realEmail: entry['realEmail'],
@@ -197,7 +197,7 @@ Santa Claus <santa.claus@northpole.xx> <me@company.xx>
         );
       }
 
-      for (var entry in testResolve) {
+      for (final entry in testResolve) {
         expect(
           mailmap.resolve(name: entry['name']!, email: entry['email']!),
           [entry['realName'], entry['realEmail']],

test/merge_test.dart

@@ -27,8 +27,10 @@ void main() {
         );
 
         final result = repo.mergeAnalysis(theirHead: commit.id);
-        expect(result[0], {GitMergeAnalysis.upToDate});
-        expect(result[1], {GitMergePreference.none});
+        expect(result, [
+          {GitMergeAnalysis.upToDate},
+          GitMergePreference.none,
+        ]);
         expect(repo.status, isEmpty);
 
         commit.free();

test/packbuilder_test.dart

@@ -87,9 +87,9 @@ void main() {
     test('successfully packs with provided packDelegate', () {
       void packDelegate(PackBuilder packBuilder) {
         final branches = repo.branches;
-        for (var branch in branches) {
+        for (final branch in branches) {
           final ref = repo.lookupReference('refs/heads/${branch.name}');
-          for (var commit in repo.log(sha: ref.target.sha)) {
+          for (final commit in repo.log(sha: ref.target.sha)) {
             packBuilder.addRecursively(commit.id);
             commit.free();
           }

test/repository_test.dart

@@ -45,7 +45,7 @@ void main() {
         expect(commits[i].id.sha, log[i]);
       }
 
-      for (var c in commits) {
+      for (final c in commits) {
         c.free();
       }
     });

test/revwalk_test.dart

@@ -36,7 +36,7 @@ void main() {
         expect(commits[i].id.sha, log[i]);
       }
 
-      for (var c in commits) {
+      for (final c in commits) {
         c.free();
       }
       walker.free();
@@ -54,7 +54,7 @@ void main() {
         expect(commits[i].id.sha, log.reversed.toList()[i]);
       }
 
-      for (var c in commits) {
+      for (final c in commits) {
         c.free();
       }
       walker.free();
@@ -77,10 +77,10 @@ void main() {
         expect(reverseSortedCommits[i].id.sha, log.reversed.toList()[i]);
       }
 
-      for (var c in timeSortedCommits) {
+      for (final c in timeSortedCommits) {
         c.free();
       }
-      for (var c in reverseSortedCommits) {
+      for (final c in reverseSortedCommits) {
         c.free();
       }
       walker.free();
@@ -97,7 +97,7 @@ void main() {
 
       expect(commits.length, 2);
 
-      for (var c in commits) {
+      for (final c in commits) {
         c.free();
       }
       walker.free();
@@ -129,7 +129,7 @@ void main() {
         expect(commits.length, 3);
       }
 
-      for (var c in commits) {
+      for (final c in commits) {
         c.free();
       }
       walker.free();