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>

pkg/fission-cli/cliwrapper/cli/cli.go

@@ -18,6 +18,7 @@ package cli
 
 import (
 	"context"
+	"io"
 	"time"
 )
 
@@ -76,5 +77,11 @@ type (
 
 		// Duration returns time duration of given flag.
 		Duration(key string) time.Duration
+
+		// Stdout returns io.Writer for stdout.
+		Stdout() io.Writer
+
+		// Stderr returns io.Writer for stderr.
+		Stderr() io.Writer
 	}
 )

pkg/fission-cli/cliwrapper/driver/cobra/cobra.go

@@ -19,6 +19,7 @@ package cobra
 import (
 	"context"
 	"fmt"
+	"io"
 	"strings"
 	"time"
 
@@ -311,3 +312,11 @@ func (u Cli) Duration(key string) time.Duration {
 	v, _ := u.c.Flags().GetDuration(key)
 	return v
 }
+
+func (u Cli) Stdout() io.Writer {
+	return u.c.OutOrStdout()
+}
+
+func (u Cli) Stderr() io.Writer {
+	return u.c.OutOrStderr()
+}

pkg/fission-cli/cliwrapper/driver/dummy/dummy.go

@@ -18,6 +18,8 @@ package dummy
 
 import (
 	"context"
+	"io"
+	"os"
 	"time"
 
 	fCli "github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
@@ -169,3 +171,11 @@ func (u Cli) Duration(key string) time.Duration {
 	}
 	return val.(time.Duration)
 }
+
+func (u Cli) Stdout() io.Writer {
+	return os.Stdout
+}
+
+func (u Cli) Stderr() io.Writer {
+	return os.Stderr
+}