diff --git a/cmd/sin-code/internal/index_cmd.go b/cmd/sin-code/internal/index_cmd.go
index a09cdff..27bb1b1 100644
--- a/cmd/sin-code/internal/index_cmd.go
+++ b/cmd/sin-code/internal/index_cmd.go
@@ -11,6 +11,8 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var indexAbsPath = filepath.Abs
+
 var IndexCmd = &cobra.Command{
 	Use:   "index",
 	Short: "Manage persistent incremental code index",
@@ -36,7 +38,7 @@ var indexBuildCmd = &cobra.Command{
 		if len(args) > 0 {
 			root = args[0]
 		}
-		root, err := filepath.Abs(root)
+		root, err := indexAbsPath(root)
 		if err != nil {
 			return err
 		}
@@ -62,7 +64,7 @@ var indexRefreshCmd = &cobra.Command{
 		if len(args) > 0 {
 			root = args[0]
 		}
-		root, err := filepath.Abs(root)
+		root, err := indexAbsPath(root)
 		if err != nil {
 			return err
 		}
@@ -96,7 +98,7 @@ var indexStatusCmd = &cobra.Command{
 		if len(args) > 0 {
 			root = args[0]
 		}
-		root, err := filepath.Abs(root)
+		root, err := indexAbsPath(root)
 		if err != nil {
 			return err
 		}
@@ -131,7 +133,7 @@ var indexWatchCmd = &cobra.Command{
 		if len(args) > 0 {
 			root = args[0]
 		}
-		root, err := filepath.Abs(root)
+		root, err := indexAbsPath(root)
 		if err != nil {
 			return err
 		}
@@ -172,7 +174,7 @@ var indexClearCmd = &cobra.Command{
 		if len(args) > 0 {
 			root = args[0]
 		}
-		root, err := filepath.Abs(root)
+		root, err := indexAbsPath(root)
 		if err != nil {
 			return err
 		}
diff --git a/cmd/sin-code/internal/memory_cmd.go b/cmd/sin-code/internal/memory_cmd.go
index fb7e6c7..7346baf 100644
--- a/cmd/sin-code/internal/memory_cmd.go
+++ b/cmd/sin-code/internal/memory_cmd.go
@@ -25,6 +25,8 @@ var (
 	memForgetID string
 	memForget   bool
 	memFormat   string
+
+	openMemoryStoreFn = openMemoryStore
 )
 
 var MemoryCmd = &cobra.Command{
@@ -90,7 +92,7 @@ var memAddCmd = &cobra.Command{
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		memInsight = args[0]
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -113,7 +115,7 @@ var memListCmd = &cobra.Command{
 	Use:   "list",
 	Short: "List memories",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -149,7 +151,7 @@ var memShowCmd = &cobra.Command{
 	Short: "Show a single memory",
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -183,7 +185,7 @@ var memSearchCmd = &cobra.Command{
 	Short: "Semantic search",
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -218,7 +220,7 @@ var memLinkCmd = &cobra.Command{
 	Short: "Add a knowledge-graph link",
 	Args:  cobra.ExactArgs(2),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -237,7 +239,7 @@ var memUnlinkCmd = &cobra.Command{
 	Short: "Remove a knowledge-graph link",
 	Args:  cobra.ExactArgs(2),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -255,7 +257,7 @@ var memGraphCmd = &cobra.Command{
 	Short: "Show knowledge-graph neighborhood",
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -283,7 +285,7 @@ var memPrimeCmd = &cobra.Command{
 	Short: "Print top-K relevant memories for an LLM prompt",
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -302,7 +304,7 @@ var memForgetCmd = &cobra.Command{
 	Short: "Soft-delete a memory (--hard for permanent)",
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
@@ -323,7 +325,7 @@ var memStatsCmd = &cobra.Command{
 	Use:   "stats",
 	Short: "Show memory statistics",
 	RunE: func(cmd *cobra.Command, args []string) error {
-		store, err := openMemoryStore()
+		store, err := openMemoryStoreFn()
 		if err != nil {
 			return err
 		}
diff --git a/cmd/sin-code/internal/plugin_cmd.go b/cmd/sin-code/internal/plugin_cmd.go
index 4d00c14..67e414b 100644
--- a/cmd/sin-code/internal/plugin_cmd.go
+++ b/cmd/sin-code/internal/plugin_cmd.go
@@ -18,6 +18,8 @@ var (
 	pluginNameArg string
 	walkFn        = filepath.Walk
 	relFn         = filepath.Rel
+
+	loadPluginFn = loadPlugin
 )
 
 var PluginCmd = &cobra.Command{
@@ -99,7 +101,7 @@ var pluginInfoCmd = &cobra.Command{
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		pluginNameArg = args[0]
-		p, err := loadPlugin(pluginNameArg)
+		p, err := loadPluginFn(pluginNameArg)
 		if err != nil {
 			return err
 		}
@@ -189,7 +191,7 @@ var pluginUninstallCmd = &cobra.Command{
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		pluginNameArg = args[0]
-		p, err := loadPlugin(pluginNameArg)
+		p, err := loadPluginFn(pluginNameArg)
 		if err != nil {
 			return err
 		}
@@ -207,7 +209,7 @@ var pluginEnableCmd = &cobra.Command{
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		pluginNameArg = args[0]
-		p, err := loadPlugin(pluginNameArg)
+		p, err := loadPluginFn(pluginNameArg)
 		if err != nil {
 			return err
 		}
@@ -225,7 +227,7 @@ var pluginDisableCmd = &cobra.Command{
 	Args:  cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
 		pluginNameArg = args[0]
-		p, err := loadPlugin(pluginNameArg)
+		p, err := loadPluginFn(pluginNameArg)
 		if err != nil {
 			return err
 		}
diff --git a/cmd/sin-code/internal/stcov2_coverage_test.go b/cmd/sin-code/internal/stcov2_coverage_test.go
index daac70f..5b360d5 100644
--- a/cmd/sin-code/internal/stcov2_coverage_test.go
+++ b/cmd/sin-code/internal/stcov2_coverage_test.go
@@ -18,6 +18,8 @@ import (
 	"time"
 
 	"github.com/OpenSIN-Code/SIN-Code/cmd/sin-code/internal/lsp"
+	"github.com/OpenSIN-Code/SIN-Code/cmd/sin-code/internal/memory"
+	"github.com/OpenSIN-Code/SIN-Code/cmd/sin-code/internal/plugins"
 )
 
 type stcov2ErrorReader struct{}
@@ -1109,6 +1111,55 @@ func TestLspServersCmd_NoServers_stcov2(t *testing.T) {
 	}
 }
 
+func TestIndexCmd_AbsPathError_stcov2(t *testing.T) {
+	orig := indexAbsPath
+	indexAbsPath = func(path string) (string, error) { return "", errors.New("abs error") }
+	defer func() { indexAbsPath = orig }()
+	_ = indexBuildCmd.RunE(indexBuildCmd, []string{"."})
+	_ = indexRefreshCmd.RunE(indexRefreshCmd, []string{"."})
+	_ = indexStatusCmd.RunE(indexStatusCmd, []string{"."})
+	_ = indexWatchCmd.RunE(indexWatchCmd, []string{"."})
+	_ = indexClearCmd.RunE(indexClearCmd, []string{"."})
+}
+
+func TestMemoryCmd_OpenStoreError_stcov2(t *testing.T) {
+	orig := openMemoryStoreFn
+	openMemoryStoreFn = func() (*memory.Store, error) { return nil, errors.New("store error") }
+	defer func() { openMemoryStoreFn = orig }()
+	_ = memAddCmd.RunE(memAddCmd, []string{"insight"})
+	_ = memListCmd.RunE(memListCmd, nil)
+	_ = memShowCmd.RunE(memShowCmd, []string{"id"})
+	_ = memSearchCmd.RunE(memSearchCmd, []string{"query"})
+	_ = memLinkCmd.RunE(memLinkCmd, []string{"a", "b"})
+	_ = memUnlinkCmd.RunE(memUnlinkCmd, []string{"a", "b"})
+	_ = memGraphCmd.RunE(memGraphCmd, []string{"id"})
+	_ = memPrimeCmd.RunE(memPrimeCmd, []string{"query"})
+	_ = memForgetCmd.RunE(memForgetCmd, []string{"id"})
+	_ = memStatsCmd.RunE(memStatsCmd, nil)
+}
+
+func TestPluginListCmd_NoDir_stcov2(t *testing.T) {
+	orig := pluginPath
+	pluginPath = "/nonexistent"
+	defer func() { pluginPath = orig }()
+	final := captureStdout(t)
+	_ = pluginListCmd.RunE(pluginListCmd, nil)
+	out := final()
+	if !strings.Contains(out, "no plugins directory") {
+		t.Errorf("expected no plugins directory, got %q", out)
+	}
+}
+
+func TestPluginCmd_LoadPluginError_stcov2(t *testing.T) {
+	orig := loadPluginFn
+	loadPluginFn = func(name string) (*plugins.Plugin, error) { return nil, errors.New("load error") }
+	defer func() { loadPluginFn = orig }()
+	_ = pluginInfoCmd.RunE(pluginInfoCmd, []string{"x"})
+	_ = pluginUninstallCmd.RunE(pluginUninstallCmd, []string{"x"})
+	_ = pluginEnableCmd.RunE(pluginEnableCmd, []string{"x"})
+	_ = pluginDisableCmd.RunE(pluginDisableCmd, []string{"x"})
+}
+
 func TestHarvestURLFetch_BodyReadError_stcov2(t *testing.T) {
 	orig := harvestHTTPClient
 	harvestHTTPClient = func(timeout int) *http.Client {