rpc: add target to getmininginfo result

test/functional/mining_basic.py

@@ -17,7 +17,9 @@ from test_framework.blocktools import (
     NORMAL_GBT_REQUEST_PARAMS,
     TIME_GENESIS_BLOCK,
     REGTEST_N_BITS,
+    REGTEST_TARGET,
     nbits_str,
+    target_str,
 )
 from test_framework.messages import (
     BLOCK_HEADER_SIZE,
@@ -209,6 +211,7 @@ class MiningTest(BitcoinTestFramework):
         assert 'currentblocktx' not in mining_info
         assert 'currentblockweight' not in mining_info
         assert_equal(mining_info['bits'], nbits_str(REGTEST_N_BITS))
+        assert_equal(mining_info['target'], target_str(REGTEST_TARGET))
         assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10'))
         assert_equal(mining_info['networkhashps'], Decimal('0.003333333333333334'))
         assert_equal(mining_info['pooledtx'], 0)