Add tests for preupgradchecks and spec/archive CLI (#2874)

* Add tests for preupgradchecks
* Add spec tests
* Add package archive tests
* Wait for cleanup
* Fix test and coverage

---------

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

cmd/preupgradechecks/checks_test.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/fission/fission/test/e2e/framework"
+)
+
+func TestPreUpgradeTaskClient(t *testing.T) {
+	f := framework.NewFramework()
+	defer f.Logger().Sync()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	err := f.Start(ctx)
+	require.NoError(t, err)
+
+	preupgradeClient, err := makePreUpgradeTaskClient(f.ClientGen(), f.Logger())
+	require.NoError(t, err)
+
+	crd := preupgradeClient.GetFunctionCRD(ctx)
+	require.NotNil(t, crd)
+
+	err = preupgradeClient.LatestSchemaApplied(ctx)
+	require.NoError(t, err)
+
+	err = preupgradeClient.VerifyFunctionSpecReferences(ctx)
+	require.NoError(t, err)
+}