"They are world class athletes; hugely professional in terms of their preparation and they came in knowing all the plays so I'm confident they've done the homework and they deserve an opportunity."
It will be the first time the Black Ferns have faced Japan, who preparing for their fifth World Cup appearance.
"We wanted to play them. We've seen them play a couple of times this year, they beat Australia, they are quick and are going to be a different challenge for us which is important.
"This weekend we want to see a progression from where we have been. We didn't play very well in Adelaide so now it's a matter of getting better at what we are good at," said Smith.
A strong Black Ferns side has been named by coaches Wayne Smith, Wes Clarke and Whitney Hansen for their last Test match before the Rugby World Cup, hosting Japan at Eden Park on Saturday (kick-off 4.30pm)
The team is:
1) Pip Love (19)
2) Luka Connor (8)
3) Amy Rule (6)
4) Joanah Ngan Woo (10)
5) Chelsea Bremner (5)
6) Liana Mikaele-Tu'u (6)
7) Sarah Hirini (10)
8) Charmaine McMenamin (27)
9) Kendra Cocksedge (61)
10) Ruahei Demant (20) – Captain
11) Ruby Tui (4)
12) Theresa Fitzpatrick (12)
13) Amy du Plessis (3)
14) Portia Woodman (19)
15) Renee Holmes (4)
16) Georgia Ponsonby (6)
17) Awhina Tangen-Wainohu (1)
18) Santo Taumata (1)
19) Maiakawanakaulani Roos (7)
20) Kendra Reynolds (5)
21) Arihiana Marino-Tauhinu (9)
22) Stacey Fluhler (20)
23) Hazel Tubic (16)
Unavailable due to injury: Alana Bremner, Tanya Kalounivale, Krystal Murray, Kennedy Simon