ctx with proposer, working through allocation test

types/context.go

@@ -188,6 +188,12 @@ func (c Context) WithBlockTime(newTime time.Time) Context {
 	return c.WithBlockHeader(newHeader)
 }
 
+func (c Context) WithProposer(addr ConsAddress) Context {
+	newHeader := c.BlockHeader()
+	newHeader.ProposerAddress = addr.Bytes()
+	return c.WithBlockHeader(newHeader)
+}
+
 func (c Context) WithBlockHeight(height int64) Context {
 	return c.withValue(contextKeyBlockHeight, height)
 }