Iran constructed the Shahroud missile test facility in the late 1980s with Chinese and North Korean assistance, and it has remained the main test facility for the Shahab missile series. [1] In July 1998, Iran launched the first, apparently unsuccessful, test flight of a Shahab-3 missile from the site. [2]

Sources:
[1] John W. Garver, China and Iran: Ancient Partners in a Post-Imperial World (Seattle, WA: University of Washington Press, 2006), p. 187; David Makovsky, "North Korean Missiles 'Due to Arrive in Iran this Month'," The Jerusalem Post, 5 December 1993, www.jpost.com; Evgeniy P. Bazhanov, "Military-Strategic Aspects of the North Korean Nuclear Program," in The North Korean Nuclear Program: Security, Strategic and New Perspectives From Russia, eds. James C. Moltz and Alexandre Y. Mansourov, (New York: Routledge, 1999), pp. 101-109 and p. 104.
[2] Gary Samore, Iran's Strategic Weapons Programmes: A Net Assessment (London: The International Institute for Strategic Studies, 2005), p. 101.