Refactor Generate Command to cobra cli lib

Signed-off-by: Marco Franssen <marco.franssen@philips.com>

cmd/slsa-provenance/cli/commands_test.go

@@ -0,0 +1,16 @@
+package cli_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/philips-labs/slsa-provenance-action/cmd/slsa-provenance/cli"
+)
+
+func TestCli(t *testing.T) {
+	assert := assert.New(t)
+
+	cli := cli.New()
+	assert.Len(cli.Commands(), 2)
+}

cmd/slsa-provenance/cli/generate_test.go

@@ -0,0 +1,21 @@
+package cli_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/philips-labs/slsa-provenance-action/cmd/slsa-provenance/cli"
+)
+
+func TestGenerate(t *testing.T) {
+	assert := assert.New(t)
+
+	cmd := cli.Generate()
+
+	assert.Len(cmd.Commands(), 2)
+	output, err := executeCommand(cmd)
+
+	assert.NoError(err)
+	assert.Contains(output, "Generate provenance using subcommands\n\nUsage:\n")
+}