diff --git a/test/git_types_test.dart b/test/git_types_test.dart
new file mode 100644
index 0000000..c83eaf1
--- /dev/null
+++ b/test/git_types_test.dart
@@ -0,0 +1,559 @@
+import 'package:libgit2dart/src/git_types.dart';
+import 'package:test/test.dart';
+import 'package:libgit2dart/libgit2dart.dart';
+
+void main() {
+  group('GitTypes', () {
+    group('ReferenceType', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 3];
+        final actual = ReferenceType.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(ReferenceType.invalid.toString(), 'ReferenceType.invalid');
+      });
+    });
+
+    group('GitFilemode', () {
+      test('returns correct values', () {
+        const expected = [0, 16384, 33188, 33261, 40960, 57344];
+        final actual = GitFilemode.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitFilemode.unreadable.toString(), 'GitFilemode.unreadable');
+      });
+    });
+
+    group('GitSort', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4];
+        final actual = GitSort.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitSort.none.toString(), 'GitSort.none');
+      });
+    });
+
+    group('GitObject', () {
+      test('returns correct values', () {
+        const expected = [-2, -1, 1, 2, 3, 4, 6, 7];
+        final actual = GitObject.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitObject.any.toString(), 'GitObject.any');
+      });
+    });
+
+    group('GitRevSpec', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4];
+        final actual = GitRevSpec.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitRevSpec.single.toString(), 'GitRevSpec.single');
+      });
+    });
+
+    group('GitBranch', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 3];
+        final actual = GitBranch.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitBranch.local.toString(), 'GitBranch.local');
+      });
+    });
+
+    group('GitStatus', () {
+      test('returns correct values', () {
+        const expected = [
+          0,
+          1,
+          2,
+          4,
+          8,
+          16,
+          128,
+          256,
+          512,
+          1024,
+          2048,
+          4096,
+          16384,
+          32768,
+        ];
+        final actual = GitStatus.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitStatus.current.toString(), 'GitStatus.current');
+      });
+    });
+
+    group('GitMergeAnalysis', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8];
+        final actual = GitMergeAnalysis.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitMergeAnalysis.none.toString(), 'GitMergeAnalysis.none');
+      });
+    });
+
+    group('GitMergePreference', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2];
+        final actual = GitMergePreference.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitMergePreference.none.toString(), 'GitMergePreference.none');
+      });
+    });
+
+    group('GitRepositoryState', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
+        final actual = GitRepositoryState.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitRepositoryState.none.toString(), 'GitRepositoryState.none');
+      });
+    });
+
+    group('GitMergeFlag', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8];
+        final actual = GitMergeFlag.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitMergeFlag.findRenames.toString(), 'GitMergeFlag.findRenames');
+      });
+    });
+
+    group('GitMergeFileFavor', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 3];
+        final actual = GitMergeFileFavor.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitMergeFileFavor.normal.toString(), 'GitMergeFileFavor.normal');
+      });
+    });
+
+    group('GitMergeFileFlag', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4, 8, 16, 32, 64, 128];
+        final actual = GitMergeFileFlag.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+            GitMergeFileFlag.defaults.toString(), 'GitMergeFileFlag.defaults');
+      });
+    });
+
+    group('GitCheckout', () {
+      test('returns correct values', () {
+        const expected = [
+          0,
+          1,
+          2,
+          4,
+          16,
+          32,
+          64,
+          128,
+          256,
+          512,
+          1024,
+          2048,
+          4096,
+          8192,
+          262144,
+          524288,
+          1048576,
+          2097152,
+          4194304,
+          8388608,
+          16777216,
+        ];
+        final actual = GitCheckout.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitCheckout.none.toString(), 'GitCheckout.none');
+      });
+    });
+
+    group('GitReset', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 3];
+        final actual = GitReset.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitReset.soft.toString(), 'GitReset.soft');
+      });
+    });
+
+    group('GitDiff', () {
+      test('returns correct values', () {
+        const expected = [
+          0,
+          1,
+          2,
+          4,
+          8,
+          16,
+          32,
+          64,
+          128,
+          256,
+          512,
+          1024,
+          2048,
+          4096,
+          8192,
+          16384,
+          32768,
+          65536,
+          131072,
+          262144,
+          1048576,
+          2097152,
+          4194304,
+          8388608,
+          16777216,
+          33554432,
+          67108864,
+          268435456,
+          536870912,
+          1073741824,
+        ];
+        final actual = GitDiff.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDiff.normal.toString(), 'GitDiff.normal');
+      });
+    });
+
+    group('GitDelta', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+        final actual = GitDelta.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDelta.unmodified.toString(), 'GitDelta.unmodified');
+      });
+    });
+
+    group('GitDiffFlag', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8];
+        final actual = GitDiffFlag.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDiffFlag.binary.toString(), 'GitDiffFlag.binary');
+      });
+    });
+
+    group('GitDiffStats', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4, 8];
+        final actual = GitDiffStats.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDiffStats.none.toString(), 'GitDiffStats.none');
+      });
+    });
+
+    group('GitDiffFind', () {
+      test('returns correct values', () {
+        const expected = [
+          0,
+          1,
+          2,
+          4,
+          8,
+          16,
+          32,
+          48,
+          64,
+          255,
+          4096,
+          8192,
+          16384,
+          32768,
+          65536,
+        ];
+        final actual = GitDiffFind.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDiffFind.byConfig.toString(), 'GitDiffFind.byConfig');
+      });
+    });
+
+    group('GitDiffLine', () {
+      test('returns correct values', () {
+        const expected = [32, 43, 45, 61, 62, 60, 70, 72, 66];
+        final actual = GitDiffLine.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDiffLine.context.toString(), 'GitDiffLine.context');
+      });
+    });
+
+    group('GitApplyLocation', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2];
+        final actual = GitApplyLocation.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitApplyLocation.workdir.toString(), 'GitApplyLocation.workdir');
+      });
+    });
+
+    group('GitConfigLevel', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 3, 4, 5, 6, -1];
+        final actual = GitConfigLevel.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+          GitConfigLevel.programData.toString(),
+          'GitConfigLevel.programData',
+        );
+      });
+    });
+
+    group('GitStash', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4];
+        final actual = GitStash.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitStash.defaults.toString(), 'GitStash.defaults');
+      });
+    });
+
+    group('GitStashApply', () {
+      test('returns correct values', () {
+        const expected = [0, 1];
+        final actual = GitStashApply.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitStashApply.defaults.toString(), 'GitStashApply.defaults');
+      });
+    });
+
+    group('GitDirection', () {
+      test('returns correct values', () {
+        const expected = [0, 1];
+        final actual = GitDirection.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDirection.fetch.toString(), 'GitDirection.fetch');
+      });
+    });
+
+    group('GitFetchPrune', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2];
+        final actual = GitFetchPrune.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+            GitFetchPrune.unspecified.toString(), 'GitFetchPrune.unspecified');
+      });
+    });
+
+    group('GitRepositoryInit', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8, 16, 32, 64];
+        final actual = GitRepositoryInit.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitRepositoryInit.bare.toString(), 'GitRepositoryInit.bare');
+      });
+    });
+
+    group('GitCredential', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8, 16, 32, 64];
+        final actual = GitCredential.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitCredential.sshKey.toString(), 'GitCredential.sshKey');
+      });
+    });
+
+    group('GitFeature', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 4, 8];
+        final actual = GitFeature.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitFeature.threads.toString(), 'GitFeature.threads');
+      });
+    });
+
+    group('GitAttributeCheck', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4, 8, 16];
+        final actual = GitAttributeCheck.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+          GitAttributeCheck.fileThenIndex.toString(),
+          'GitAttributeCheck.fileThenIndex',
+        );
+      });
+    });
+
+    group('GitBlameFlag', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 4, 8, 16, 32, 64];
+        final actual = GitBlameFlag.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitBlameFlag.normal.toString(), 'GitBlameFlag.normal');
+      });
+    });
+
+    group('GitRebaseOperation', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2, 3, 4, 5];
+        final actual = GitRebaseOperation.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitRebaseOperation.pick.toString(), 'GitRebaseOperation.pick');
+      });
+    });
+
+    group('GitDescribeStrategy', () {
+      test('returns correct values', () {
+        const expected = [0, 1, 2];
+        final actual = GitDescribeStrategy.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitDescribeStrategy.tags.toString(), 'GitDescribeStrategy.tags');
+      });
+    });
+
+    group('GitSubmoduleIgnore', () {
+      test('returns correct values', () {
+        const expected = [-1, 1, 2, 3, 4];
+        final actual = GitSubmoduleIgnore.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitSubmoduleIgnore.none.toString(), 'GitSubmoduleIgnore.none');
+      });
+    });
+
+    group('GitSubmoduleUpdate', () {
+      test('returns correct values', () {
+        const expected = [1, 2, 3, 4];
+        final actual = GitSubmoduleUpdate.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(GitSubmoduleUpdate.none.toString(), 'GitSubmoduleUpdate.none');
+      });
+    });
+
+    group('GitSubmoduleStatus', () {
+      test('returns correct values', () {
+        const expected = [
+          1,
+          2,
+          4,
+          8,
+          16,
+          32,
+          64,
+          128,
+          256,
+          512,
+          1024,
+          2048,
+          4096,
+          8192,
+        ];
+        final actual = GitSubmoduleStatus.values.map((e) => e.value).toList();
+        expect(actual, expected);
+      });
+
+      test('returns string representation of object', () {
+        expect(
+            GitSubmoduleStatus.inHead.toString(), 'GitSubmoduleStatus.inHead');
+      });
+    });
+  });
+}