From ebec7317ca1acbc65afa7fb08fc219c315fc4527 Mon Sep 17 00:00:00 2001
From: Ben Woosley <ben.woosley@gmail.com>
Date: Sun, 20 May 2018 14:04:15 -0700
Subject: Drop the chain argument to GetDifficulty

This removes the need to include rpc/blockchain.cpp in order to put
GetDifficulty under test. GetDifficulty was called in two ways:
* with a guaranteed non-null blockindex
* with no argument

Change the latter case to be provided chainActive.Tip() explicitly.
---
 src/test/blockchain_tests.cpp | 54 +++----------------------------------------
 1 file changed, 3 insertions(+), 51 deletions(-)

(limited to 'src/test')

diff --git a/src/test/blockchain_tests.cpp b/src/test/blockchain_tests.cpp
index 5b8df32158..d2d0008122 100644
--- a/src/test/blockchain_tests.cpp
+++ b/src/test/blockchain_tests.cpp
@@ -2,7 +2,7 @@
 
 #include "stdlib.h"
 
-#include "rpc/blockchain.cpp"
+#include "rpc/blockchain.h"
 #include "test/test_bitcoin.h"
 
 /* Equality between doubles is imprecise. Comparison should be done
@@ -22,14 +22,6 @@ static CBlockIndex* CreateBlockIndexWithNbits(uint32_t nbits)
     return block_index;
 }
 
-static CChain CreateChainWithNbits(uint32_t nbits)
-{
-    CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
-    CChain chain;
-    chain.SetTip(block_index);
-    return chain;
-}
-
 static void RejectDifficultyMismatch(double difficulty, double expected_difficulty) {
      BOOST_CHECK_MESSAGE(
         DoubleEquals(difficulty, expected_difficulty, 0.00001),
@@ -43,12 +35,7 @@ static void RejectDifficultyMismatch(double difficulty, double expected_difficul
 static void TestDifficulty(uint32_t nbits, double expected_difficulty)
 {
     CBlockIndex* block_index = CreateBlockIndexWithNbits(nbits);
-    /* Since we are passing in block index explicitly,
-     * there is no need to set up anything within the chain itself.
-     */
-    CChain chain;
-
-    double difficulty = GetDifficulty(chain, block_index);
+    double difficulty = GetDifficulty(block_index);
     delete block_index;
 
     RejectDifficultyMismatch(difficulty, expected_difficulty);
@@ -84,43 +71,8 @@ BOOST_AUTO_TEST_CASE(get_difficulty_for_very_high_target)
 // Verify that difficulty is 1.0 for an empty chain.
 BOOST_AUTO_TEST_CASE(get_difficulty_for_null_tip)
 {
-    CChain chain;
-    double difficulty = GetDifficulty(chain, nullptr);
+    double difficulty = GetDifficulty(nullptr);
     RejectDifficultyMismatch(difficulty, 1.0);
 }
 
-/* Verify that if difficulty is based upon the block index
- * in the chain, if no block index is explicitly specified.
- */
-BOOST_AUTO_TEST_CASE(get_difficulty_for_null_block_index)
-{
-    CChain chain = CreateChainWithNbits(0x1df88f6f);
-
-    double difficulty = GetDifficulty(chain, nullptr);
-    delete chain.Tip();
-
-    double expected_difficulty = 0.004023;
-
-    RejectDifficultyMismatch(difficulty, expected_difficulty);
-}
-
-/* Verify that difficulty is based upon the explicitly specified
- * block index rather than being taken from the provided chain,
- * when both are present.
- */
-BOOST_AUTO_TEST_CASE(get_difficulty_for_block_index_overrides_tip)
-{
-    CChain chain = CreateChainWithNbits(0x1df88f6f);
-    /* This block index's nbits should be used
-     * instead of the chain's when calculating difficulty.
-     */
-    CBlockIndex* override_block_index = CreateBlockIndexWithNbits(0x12345678);
-
-    double difficulty = GetDifficulty(chain, override_block_index);
-    delete chain.Tip();
-    delete override_block_index;
-
-    RejectDifficultyMismatch(difficulty, 5913134931067755359633408.0);
-}
-
 BOOST_AUTO_TEST_SUITE_END()
-- 
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