diff --git a/cmd/docker-trust/internal/test/cmd.go b/cmd/docker-trust/internal/test/cmd.go
index 8b98d2df623b..f3d36b69e5b8 100644
--- a/cmd/docker-trust/internal/test/cmd.go
+++ b/cmd/docker-trust/internal/test/cmd.go
@@ -27,8 +27,11 @@ func TerminatePrompt(ctx context.Context, t *testing.T, cmd *cobra.Command, cli
 	}))
 	cli.SetOut(outStream)
 
-	r, _, err := os.Pipe()
+	r, w, err := os.Pipe()
 	assert.NilError(t, err)
+
+	// Keep the write end alive for the duration of the test.
+	defer w.Close()
 	cli.SetIn(streams.NewIn(r))
 
 	notifyCtx, notifyCancel := context.WithCancel(ctx)
@@ -58,8 +61,6 @@ func TerminatePrompt(ctx context.Context, t *testing.T, cmd *cobra.Command, cli
 		}()
 	}
 
-	assert.Check(t, cli.OutBuffer().Len() > 0)
-
 	// a small delay to ensure the plugin is prompting
 	time.Sleep(100 * time.Microsecond)
 
diff --git a/internal/test/cmd.go b/internal/test/cmd.go
index 8b98d2df623b..f3d36b69e5b8 100644
--- a/internal/test/cmd.go
+++ b/internal/test/cmd.go
@@ -27,8 +27,11 @@ func TerminatePrompt(ctx context.Context, t *testing.T, cmd *cobra.Command, cli
 	}))
 	cli.SetOut(outStream)
 
-	r, _, err := os.Pipe()
+	r, w, err := os.Pipe()
 	assert.NilError(t, err)
+
+	// Keep the write end alive for the duration of the test.
+	defer w.Close()
 	cli.SetIn(streams.NewIn(r))
 
 	notifyCtx, notifyCancel := context.WithCancel(ctx)
@@ -58,8 +61,6 @@ func TerminatePrompt(ctx context.Context, t *testing.T, cmd *cobra.Command, cli
 		}()
 	}
 
-	assert.Check(t, cli.OutBuffer().Len() > 0)
-
 	// a small delay to ensure the plugin is prompting
 	time.Sleep(100 * time.Microsecond)