diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4611ac86..d34478cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -158,6 +158,7 @@ set (LOOT_TESTS_SRC "${CMAKE_SOURCE_DIR}/src/tests/main.cpp")
 set (LOOT_TESTS_HEADERS "${CMAKE_SOURCE_DIR}/src/tests/fixtures.h"
                         "${CMAKE_SOURCE_DIR}/src/tests/api/test_api.h"
                         "${CMAKE_SOURCE_DIR}/src/tests/backend/game/test_game_settings.h"
+                        "${CMAKE_SOURCE_DIR}/src/tests/backend/helpers/test_git_helper.h"
                         "${CMAKE_SOURCE_DIR}/src/tests/backend/helpers/test_helpers.h"
                         "${CMAKE_SOURCE_DIR}/src/tests/backend/helpers/test_language.h"
                         "${CMAKE_SOURCE_DIR}/src/tests/backend/helpers/test_yaml_set_helpers.h"
diff --git a/src/tests/backend/helpers/test_git_helper.h b/src/tests/backend/helpers/test_git_helper.h
new file mode 100644
index 00000000..e1ee2c91
--- /dev/null
+++ b/src/tests/backend/helpers/test_git_helper.h
@@ -0,0 +1,135 @@
+/*  LOOT
+
+A load order optimisation tool for Oblivion, Skyrim, Fallout 3 and
+Fallout: New Vegas.
+
+Copyright (C) 2014-2015    WrinklyNinja
+
+This file is part of LOOT.
+
+LOOT is free software: you can redistribute
+it and/or modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation, either version 3 of
+the License, or (at your option) any later version.
+
+LOOT is distributed in the hope that it will
+be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with LOOT.  If not, see
+<http://www.gnu.org/licenses/>.
+*/
+
+#ifndef LOOT_TEST_BACKEND_HELPERS_LANGUAGE
+#define LOOT_TEST_BACKEND_HELPERS_LANGUAGE
+
+#include "backend/error.h"
+#include "backend/helpers/git_helper.h"
+#include "tests/fixtures.h"
+
+using loot::GitHelper;
+
+#ifdef _WIN32
+boost::filesystem::path parentRepoRoot = boost::filesystem::current_path().parent_path().parent_path();
+#else
+boost::filesystem::path parentRepoRoot = boost::filesystem::current_path().parent_path();
+#endif
+
+TEST(GitHelper, ConstructorAndDestructor) {
+    GitHelper * git = new GitHelper();
+    EXPECT_EQ(nullptr, git->repo);
+
+    EXPECT_EQ(2, git_libgit2_init());
+    delete git;
+    EXPECT_EQ(0, git_libgit2_shutdown());
+}
+
+TEST(GitHelper, Call) {
+    GitHelper git;
+    EXPECT_NO_THROW(git.Call(0));
+    EXPECT_THROW(git.Call(1), loot::error);
+    EXPECT_THROW(git.Call(-1), loot::error);
+}
+
+TEST(GitHelper, SetErrorMessage) {
+    GitHelper git;
+    git.SetErrorMessage("test message");
+
+    try {
+        git.Call(1);
+        ADD_FAILURE() << "An exception should have been thrown.";
+    }
+    catch (loot::error& e) {
+        EXPECT_NE(nullptr, strstr(e.what(), "test message"));
+    }
+}
+
+TEST(GitHelper, Free) {
+    // Initialise buffer member, it's simplest to test with.
+    GitHelper git;
+    git_buf_set(&git.buf, "foo", 4);
+    EXPECT_NE(nullptr, git.buf.ptr);
+    EXPECT_EQ(4, git.buf.size);
+
+    git.Free();
+    EXPECT_EQ(nullptr, git.buf.ptr);
+    EXPECT_EQ(0, git.buf.size);
+}
+
+TEST(GitHelper, IsRepository) {
+    GitHelper git;
+
+    ASSERT_TRUE(boost::filesystem::exists(parentRepoRoot));
+    EXPECT_TRUE(git.IsRepository(parentRepoRoot));
+    EXPECT_FALSE(git.IsRepository(boost::filesystem::current_path()));
+}
+
+class IsFileDifferent : public ::testing::Test {
+    inline virtual void SetUp() {
+        GitHelper git;
+        ASSERT_TRUE(git.IsRepository(parentRepoRoot));
+        ASSERT_FALSE(git.IsRepository(boost::filesystem::current_path()));
+
+        ASSERT_TRUE(boost::filesystem::exists(parentRepoRoot / "README.md"));
+
+        // Create a backup of CONTRIBUTING.md.
+        ASSERT_TRUE(boost::filesystem::exists(parentRepoRoot / "CONTRIBUTING.md"));
+        ASSERT_FALSE(boost::filesystem::exists(parentRepoRoot / "CONTRIBUTING.md.copy"));
+        ASSERT_NO_THROW(boost::filesystem::copy(parentRepoRoot / "CONTRIBUTING.md", parentRepoRoot / "CONTRIBUTING.md.copy"));
+        ASSERT_TRUE(boost::filesystem::exists(parentRepoRoot / "CONTRIBUTING.md.copy"));
+
+        // Edit CONTRIBUTING.md
+        loot::ofstream out(parentRepoRoot / "CONTRIBUTING.md");
+        out.close();
+    }
+
+    inline virtual void TearDown() {
+        // Restore original CONTRIBUTING.md
+        ASSERT_NO_THROW(boost::filesystem::remove(parentRepoRoot / "CONTRIBUTING.md"));
+        ASSERT_NO_THROW(boost::filesystem::rename(parentRepoRoot / "CONTRIBUTING.md.copy", parentRepoRoot / "CONTRIBUTING.md"));
+        ASSERT_TRUE(boost::filesystem::exists(parentRepoRoot / "CONTRIBUTING.md"));
+        ASSERT_FALSE(boost::filesystem::exists(parentRepoRoot / "CONTRIBUTING.md.copy"));
+    }
+};
+
+TEST_F(IsFileDifferent, InvalidRepository) {
+    EXPECT_THROW(loot::IsFileDifferent(boost::filesystem::current_path(), "README.md"), loot::error);
+}
+
+TEST_F(IsFileDifferent, SameFile) {
+    EXPECT_FALSE(loot::IsFileDifferent(parentRepoRoot, "README.md"));
+}
+
+TEST_F(IsFileDifferent, NewFile) {
+    // New files not in the index are not tracked by Git, so aren't considered
+    // different.
+    EXPECT_FALSE(loot::IsFileDifferent(parentRepoRoot, "CONTRIBUTING.md.copy"));
+}
+
+TEST_F(IsFileDifferent, DifferentFile) {
+    EXPECT_TRUE(loot::IsFileDifferent(parentRepoRoot, "CONTRIBUTING.md"));
+}
+
+#endif
diff --git a/src/tests/main.cpp b/src/tests/main.cpp
index 0aefa8dd..731f6556 100644
--- a/src/tests/main.cpp
+++ b/src/tests/main.cpp
@@ -30,6 +30,7 @@
 #include "backend/metadata/test_message_content.h"
 #include "backend/metadata/test_plugin_dirty_info.h"
 #include "backend/metadata/test_tag.h"
+#include "backend/helpers/test_git_helper.h"
 #include "backend/helpers/test_helpers.h"
 #include "backend/helpers/test_language.h"
 #include "backend/helpers/test_yaml_set_helpers.h"