This instructables show how to test ESP board on bread board without soldering, especially for ESP-07 and ESP-12(E) and may be ESP-03.
ESP board most require 2 mm pitch connector but most bread board are 2.54 mm pitch, It need some tricks on connect between ESP board and bread board.
- 2 mm pitch male pin connector with 14 or more positions, e.g. http://www.digikey.com/product-detail/en/3m/951240…
- ESP board, ESP-07 and ESP-12(E) preferred because they have pin hole on the connector
- 2 resistors for pull up and pull down resistor, it can be 1 – 12 k Ohms depends what you have in hand
For More Details: ESP8266 Bread Board Testing