diff --git a/go/cmd/internal/docgen/docgen.go b/go/cmd/internal/docgen/docgen.go
index f52042e80af..eea935ed396 100644
--- a/go/cmd/internal/docgen/docgen.go
+++ b/go/cmd/internal/docgen/docgen.go
@@ -66,7 +66,7 @@ func GenerateMarkdownTree(cmd *cobra.Command, dir string) error {
 	switch fi, err := os.Stat(dir); {
 	case errors.Is(err, fs.ErrNotExist):
 		if err := os.MkdirAll(dir, 0755); err != nil {
-			return err
+			return fmt.Errorf("failed to create \"%s\" directory: %w", dir, err)
 		}
 	case err != nil:
 		return err
@@ -194,7 +194,7 @@ func anonymizeHomedir(file string) (err error) {
 	// We're replacing the stuff inside the square brackets in the example sed
 	// below:
 	// 	's:Paths to search for config files in. (default \[.*\])$:Paths to search for config files in. (default \[<WORKDIR>\]):'
-	sed := exec.Command("sed", "-i", "", "-e", fmt.Sprintf("s:%s:<WORKDIR>:i", wd), file)
+	sed := exec.Command("sed", "-i", "-e", fmt.Sprintf("s:%s:<WORKDIR>:i", wd), file)
 	if out, err := sed.CombinedOutput(); err != nil {
 		return fmt.Errorf("%w: %s", err, out)
 	}
@@ -215,7 +215,7 @@ func getCommitID(ref string) (string, error) {
 	gitShow := exec.Command("git", "show", "--pretty=format:%H", "--no-patch", ref)
 	out, err := gitShow.Output()
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("failed to get the commit id for reference \"%s\": %w", ref, err)
 	}
 
 	return string(out), nil
diff --git a/go/cmd/internal/docgen/docgen_test.go b/go/cmd/internal/docgen/docgen_test.go
new file mode 100644
index 00000000000..2370727cde5
--- /dev/null
+++ b/go/cmd/internal/docgen/docgen_test.go
@@ -0,0 +1,191 @@
+/*
+Copyright 2024 The Vitess Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package docgen
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGenerateMarkdownTree(t *testing.T) {
+	tests := []struct {
+		name      string
+		dir       string
+		cmd       *cobra.Command
+		expectErr bool
+	}{
+		{
+			name:      "Empty dir",
+			dir:       "",
+			cmd:       &cobra.Command{},
+			expectErr: true,
+		},
+		{
+			name:      "current dir",
+			dir:       "./",
+			cmd:       &cobra.Command{},
+			expectErr: false,
+		},
+		{
+			name:      "Permission denied",
+			dir:       "/root",
+			cmd:       &cobra.Command{},
+			expectErr: true,
+		},
+		{
+			name:      "Not a directory error",
+			dir:       "./docgen.go",
+			cmd:       &cobra.Command{},
+			expectErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := GenerateMarkdownTree(tt.cmd, tt.dir)
+			if !tt.expectErr {
+				require.NoError(t, err)
+			} else {
+				require.Error(t, err)
+			}
+		})
+	}
+}
+
+func TestRestructure(t *testing.T) {
+	rootCmd := &cobra.Command{
+		Use: "root-command",
+	}
+	cmd := &cobra.Command{
+		Use: "random",
+	}
+	rootCmd.AddCommand(cmd)
+	cmds := []*cobra.Command{rootCmd}
+
+	tests := []struct {
+		name      string
+		rootDir   string
+		dir       string
+		cmds      []*cobra.Command
+		expectErr bool
+	}{
+		{
+			name: "Empty commands",
+			cmds: []*cobra.Command{},
+		},
+		{
+			name:      "Non-empty commands",
+			rootDir:   "../",
+			dir:       "./",
+			cmds:      cmds,
+			expectErr: true,
+		},
+		{
+			name:      "No subcommands",
+			rootDir:   "../",
+			dir:       "./",
+			cmds:      []*cobra.Command{{Use: "help"}, {Use: "test-cmd"}},
+			expectErr: true,
+		},
+		{
+			name:      "No subcommands with rootDir and dir unset",
+			cmds:      []*cobra.Command{{Use: "random"}},
+			expectErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := restructure(tt.rootDir, tt.dir, tt.name, tt.cmds)
+			if !tt.expectErr {
+				require.NoError(t, err)
+			} else {
+				require.Error(t, err)
+			}
+		})
+	}
+}
+
+func TestLinkHandler(t *testing.T) {
+	tests := []struct {
+		name        string
+		fileName    string
+		expectedStr string
+	}{
+		{
+			name:        "Normal value",
+			fileName:    "Some_value",
+			expectedStr: "./some_value/",
+		},
+		{
+			name:        "Abnormal value",
+			fileName:    `./.jash13_24`,
+			expectedStr: "../",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			str := linkHandler(tt.fileName)
+			require.Equal(t, tt.expectedStr, str)
+		})
+	}
+}
+
+func TestNewParentLinkSedCommand(t *testing.T) {
+	tests := []struct {
+		name           string
+		parentDir      string
+		fileName       string
+		expectedOutput string
+	}{
+		{
+			name:           "Empty values",
+			expectedOutput: "sed -i  -e s:(.//):(../):i ",
+		},
+		{
+			name:           "Normal value",
+			parentDir:      "./",
+			fileName:       "Some_value",
+			expectedOutput: "sed -i  -e s:(././/):(../):i Some_value",
+		},
+		{
+			name:           "Abnormal value",
+			parentDir:      "/root",
+			fileName:       `./.jash13_24`,
+			expectedOutput: "sed -i  -e s:(.//root/):(../):i ./.jash13_24",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := newParentLinkSedCommand(tt.parentDir, tt.fileName)
+			// We only check for suffix because the sed command's actual path may differ on different machines.
+			require.True(t, strings.HasSuffix(cmd.String(), tt.expectedOutput))
+		})
+	}
+}
+
+func TestGetCommitID(t *testing.T) {
+	// This function should return an error when the reference is not in the
+	// git tree.
+	_, err := getCommitID("invalid ref")
+	require.Error(t, err)
+}