adds unit test for deprecated command to pacify codecov

Signed-off-by: Joe Kimmel <jkimmel@vmware.com>

internal/commands/stack_test.go

@@ -0,0 +1,53 @@
+package commands
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/sclevine/spec"
+	"github.com/sclevine/spec/report"
+	"github.com/spf13/cobra"
+
+	"github.com/buildpacks/pack/pkg/logging"
+	h "github.com/buildpacks/pack/testhelpers"
+)
+
+func TestStackCommand(t *testing.T) {
+	spec.Run(t, "StackCommand", testStackCommand, spec.Parallel(), spec.Report(report.Terminal{}))
+}
+
+func testStackCommand(t *testing.T, when spec.G, it spec.S) {
+	var (
+		command *cobra.Command
+		outBuf  bytes.Buffer
+	)
+
+	it.Before(func() {
+		command = NewStackCommand(logging.NewLogWithWriters(&outBuf, &outBuf))
+	})
+
+	when("#Stack", func() {
+		it("displays stack information", func() {
+			command.SetArgs([]string{})
+			bb := bytes.NewBufferString("") // In most tests we don't seem to need to this, not sure why it's necessary here.
+			command.SetOut(bb)
+			h.AssertNil(t, command.Execute())
+			h.AssertEq(t, bb.String(), `(Deprecated)
+Stacks will continue to be supported through at least 2024 but are deprecated in favor of using BuildImages and RunImages directly. Please see our docs for more details- https://buildpacks.io/docs/concepts/components/stack
+
+Usage:
+  stack [command]
+
+Available Commands:
+  completion  Generate the autocompletion script for the specified shell
+  help        Help about any command
+  suggest     (deprecated) List the recommended stacks
+
+Flags:
+  -h, --help   help for stack
+
+Use "stack [command] --help" for more information about a command.
+`)
+		})
+	})
+}