Testing activeHardFork for Rinkeby

Author: evertonfraga

tests/hardforks.ts

@@ -107,6 +107,10 @@ tape('[Common]: Hardfork logic', function(t: tape.Test) {
  msg = 'should return spuriousDragon as latest active HF for Ropsten with limited supported HFs'
  st.equal(c.activeHardfork(null, { onlySupported: true }), 'spuriousDragon', msg)
 
+ c = new Common('rinkeby')
+ msg = 'should return Istanbul as latest active HF for Rinkeby'
+ st.equal(c.activeHardfork(), 'istanbul', msg)
+
  st.end()
  })