diff --git a/cmd/check.go b/cmd/check.go
index d7bd33afd..19e0519a8 100644
--- a/cmd/check.go
+++ b/cmd/check.go
@@ -18,7 +18,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
 
@@ -27,8 +26,8 @@ import (
 
 var checker *ctl.CheckCommand
 
-func newCheckCommand(_ io.Reader, _, _ io.Writer) *cobra.Command {
-	checker = ctl.NewCheckCommand(os.Stdin, os.Stdout, os.Stderr)
+func newCheckCommand(stdin io.Reader, stdout io.Writer, stderr io.Writer) *cobra.Command {
+	checker = ctl.NewCheckCommand(stdin, stdout, stderr)
 	checkCmd := &cobra.Command{
 		Use:   "check <path> [path2]...",
 		Short: "Do a consistency check on a pilosa data file.",
diff --git a/cmd/config.go b/cmd/config.go
index a877d12ef..73464ba65 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -17,7 +17,6 @@ package cmd
 import (
 	"context"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
 
@@ -28,7 +27,7 @@ import (
 var conf *ctl.ConfigCommand
 
 func newConfigCommand(stdin io.Reader, stdout, stderr io.Writer) *cobra.Command {
-	conf = ctl.NewConfigCommand(os.Stdin, os.Stdout, os.Stderr)
+	conf = ctl.NewConfigCommand(stdin, stdout, stderr)
 	Server := server.NewCommand(stdin, stdout, stderr)
 	confCmd := &cobra.Command{
 		Use:   "config",
diff --git a/cmd/export.go b/cmd/export.go
index 217e9f09c..6cfeb0d9c 100644
--- a/cmd/export.go
+++ b/cmd/export.go
@@ -17,7 +17,6 @@ package cmd
 import (
 	"context"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
 
@@ -26,8 +25,8 @@ import (
 
 var Exporter *ctl.ExportCommand
 
-func newExportCommand(_ io.Reader, _, _ io.Writer) *cobra.Command {
-	Exporter = ctl.NewExportCommand(os.Stdin, os.Stdout, os.Stderr)
+func newExportCommand(stdin io.Reader, stdout, stderr io.Writer) *cobra.Command {
+	Exporter = ctl.NewExportCommand(stdin, stdout, stderr)
 	exportCmd := &cobra.Command{
 		Use:   "export",
 		Short: "Export data from pilosa.",
diff --git a/cmd/generate_config.go b/cmd/generate_config.go
index 6421a1f4f..8c8553aa4 100644
--- a/cmd/generate_config.go
+++ b/cmd/generate_config.go
@@ -17,7 +17,6 @@ package cmd
 import (
 	"context"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
 
@@ -26,8 +25,8 @@ import (
 
 var generateConf *ctl.GenerateConfigCommand
 
-func newGenerateConfigCommand(_ io.Reader, _, _ io.Writer) *cobra.Command {
-	generateConf = ctl.NewGenerateConfigCommand(os.Stdin, os.Stdout, os.Stderr)
+func newGenerateConfigCommand(stdin io.Reader, stdout io.Writer, stderr io.Writer) *cobra.Command {
+	generateConf = ctl.NewGenerateConfigCommand(stdin, stdout, stderr)
 	confCmd := &cobra.Command{
 		Use:   "generate-config",
 		Short: "Print the default configuration.",
diff --git a/cmd/inspect.go b/cmd/inspect.go
index 4f5ff9301..570e7aae3 100644
--- a/cmd/inspect.go
+++ b/cmd/inspect.go
@@ -18,7 +18,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/spf13/cobra"
 
@@ -27,8 +26,8 @@ import (
 
 var inspector *ctl.InspectCommand
 
-func newInspectCommand(_ io.Reader, _, _ io.Writer) *cobra.Command {
-	inspector = ctl.NewInspectCommand(os.Stdin, os.Stdout, os.Stderr)
+func newInspectCommand(stdin io.Reader, stdout, stderr io.Writer) *cobra.Command {
+	inspector = ctl.NewInspectCommand(stdin, stdout, stderr)
 
 	inspectCmd := &cobra.Command{
 		Use:   "inspect",