1 files changed, 110 insertions, 0 deletions
diff --git a/plumbing/object/patch_test.go b/plumbing/object/patch_test.go
index 2cff795..e0e63a5 100644
--- a/plumbing/object/patch_test.go
+++ b/plumbing/object/patch_test.go
@@ -45,3 +45,113 @@ func (s *PatchSuite) TestStatsWithSubmodules(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(p, NotNil)
 }
+
+func (s *PatchSuite) TestFileStatsString(c *C) {
+	testCases := []struct {
+		description string
+		input       FileStats
+		expected    string
+	}{
+
+		{
+			description: "no files changed",
+			input:       []FileStat{},
+			expected:    "",
+		},
+		{
+			description: "one file touched - no changes",
+			input: []FileStat{
+				{
+					Name: "file1",
+				},
+			},
+			expected: " file1 | 0 \n",
+		},
+		{
+			description: "one file changed",
+			input: []FileStat{
+				{
+					Name:     "file1",
+					Addition: 1,
+				},
+			},
+			expected: " file1 | 1 +\n",
+		},
+		{
+			description: "one file changed with one addition and one deletion",
+			input: []FileStat{
+				{
+					Name:     ".github/workflows/git.yml",
+					Addition: 1,
+					Deletion: 1,
+				},
+			},
+			expected: " .github/workflows/git.yml | 2 +-\n",
+		},
+		{
+			description: "two files changed",
+			input: []FileStat{
+				{
+					Name:     ".github/workflows/git.yml",
+					Addition: 1,
+					Deletion: 1,
+				},
+				{
+					Name:     "cli/go-git/go.mod",
+					Addition: 4,
+					Deletion: 4,
+				},
+			},
+			expected: " .github/workflows/git.yml | 2 +-\n cli/go-git/go.mod         | 8 ++++----\n",
+		},
+		{
+			description: "three files changed",
+			input: []FileStat{
+				{
+					Name:     ".github/workflows/git.yml",
+					Addition: 3,
+					Deletion: 3,
+				},
+				{
+					Name:     "worktree.go",
+					Addition: 107,
+				},
+				{
+					Name:     "worktree_test.go",
+					Addition: 75,
+				},
+			},
+			expected: " .github/workflows/git.yml |   6 +++---\n" +
+				" worktree.go               | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++\n" +
+				" worktree_test.go          |  75 +++++++++++++++++++++++++++++++++++++++++++++++++++++\n",
+		},
+		{
+			description: "three files changed with deletions and additions",
+			input: []FileStat{
+				{
+					Name:     ".github/workflows/git.yml",
+					Addition: 3,
+					Deletion: 3,
+				},
+				{
+					Name:     "worktree.go",
+					Addition: 107,
+					Deletion: 217,
+				},
+				{
+					Name:     "worktree_test.go",
+					Addition: 75,
+					Deletion: 275,
+				},
+			},
+			expected: " .github/workflows/git.yml |   6 +++---\n" +
+				" worktree.go               | 324 ++++++++++++++++++-----------------------------------\n" +
+				" worktree_test.go          | 350 ++++++++++++-----------------------------------------\n",
+		},
+	}
+
+	for _, tc := range testCases {
+		c.Log("Executing test cases:", tc.description)
+		c.Assert(printStat(tc.input), Equals, tc.expected)
+	}
+}