diff --git a/tests/core_tests/chain_switch_1.cpp b/tests/core_tests/chain_switch_1.cpp
index 2f11dbab..2657ba5c 100644
--- a/tests/core_tests/chain_switch_1.cpp
+++ b/tests/core_tests/chain_switch_1.cpp
@@ -435,7 +435,7 @@ bool chain_switching_when_gindex_spent_in_both_chains::generate(std::vector<test
   //  0      1      11     12     13     14             < height
   // (0 )-  (1 )...(1r)-  (2 )-  (3 )-                  < main chain
   //         ^        \          tx_1                   < txs
-  //         |         \
+  //         |         \ 
   //         |          \-(2a)-  (3a)-  (4a)-           < alt chain
   //         +                   tx_1                   < txs
 
@@ -471,7 +471,7 @@ bool alt_chain_coins_pow_mined_then_spent::generate(std::vector<test_event_entry
 
   //  0      1      2      12      13
   // (0 )-  (1 )-  . . .  (1r)-  
-  //          \
+  //          \ 
   //           \-  (2a)...(2ra)-  (3a)-
   //                |
   //                +-------------tx_1      tx_1 spents 2a.miner_tx output
@@ -540,7 +540,7 @@ bool alt_blocks_validation_and_same_new_amount_in_two_txs::generate(std::vector<
 
   //  0      1       11      12      13
   // (0 )-  (1 )-...(1r)-   (2 )-   (3 )-
-  //                  \
+  //                  \ 
   //                   \-   (2a)-   (3a)-
   //                                tx_1
   //                                tx_2
@@ -573,7 +573,7 @@ bool alt_blocks_with_the_same_txs::generate(std::vector<test_event_entry>& event
   //  0      1       11      12      13      14
   // (0 )-  (1 )-...(1r)-   (2 )-   (3 )-
   //                  \     tx_0
-  //                   \
+  //                   \ 
   //                    \-  (2a)-   (3a)-   (4 )-
   //                        tx_0
 
diff --git a/tests/core_tests/pos_validation.cpp b/tests/core_tests/pos_validation.cpp
index df2afe97..2fb6de17 100644
--- a/tests/core_tests/pos_validation.cpp
+++ b/tests/core_tests/pos_validation.cpp
@@ -923,7 +923,7 @@ bool pos_altblocks_validation::generate(std::vector<test_event_entry>& events) c
   //          +-----------------------+
   //          |                      tx_0                                tx_0 spends all outputs in blk_1 (main chain)
   // (0 )-   (1 )-...(1r)-   (2 )-   (3 )-...(3r)-   (4 )-   (5 )-       <- main chain
-  //           |        \
+  //           |        \ 
   //           |         \-  (2a)-                                       <- alt chain
   //           +--------------+                                          PoS block 2a uses stake already spent in main chain
 
@@ -941,7 +941,7 @@ bool pos_altblocks_validation::generate(std::vector<test_event_entry>& events) c
   //          +-----------------------+
   //          |                      tx_0                                tx_0 spends all outputs in blk_1 (main chain)
   // (0 )-   (1 )-...(1r)-   (2 )-   (3 )-...(3r)-   (4 )-   (5 )-       <- main chain
-  //          ||        \
+  //          ||        \ 
   //          ||         \-  (2a)-   #3a#-                               <- alt chain
   //          |+--------------+       |                                  PoS block 2a uses stake already spent in main chain (okay)
   //          +-----------------------+                                  PoS block 3a uses stake already spent in current alt chain (fail)
@@ -962,11 +962,11 @@ bool pos_altblocks_validation::generate(std::vector<test_event_entry>& events) c
   //          +-----------------------+
   //          |                      tx_0                                        tx_0 spends all outputs in blk_1 (main chain)
   // (0 )-   (1 )-...(1r)-   (2 )-   (3 )- ........  (3r)-   (4 )-   (5 )-       <- main chain
-  //          ||        \
+  //          ||        \ 
   //          ||         \-  (2a)-   #3a#-                                       <- alt chain
   //          |+--------------+ \     |                                          PoS block 2a uses stake already spent in main chain (okay)
   //          +---------------|-------+                                          PoS block 3a uses stake already spent in current alt chain (fail)
-  //                          |   \
+  //                          |   \ 
   //                          |    \ ...... (2br)-   (3b)-                       <- alt chain
   //                          |                       |
   //                          +-----------------------+                          PoS block 3b uses as stake an output, created in current alt chain (2a)
@@ -989,7 +989,7 @@ bool pos_altblocks_validation::generate(std::vector<test_event_entry>& events) c
   //          ||         \-  (2a)-   #3a#-                 |                     <- alt chain
   //          |+--------------+ \     |                    \                     PoS block 2a uses stake already spent in main chain (okay)
   //          +---------------|-------+                     \                    PoS block 3a uses stake already spent in current alt chain (fail)
-  //                          |   \                          \
+  //                          |   \                          \ 
   //                          |    \ ...... (2br)-   (3b)-   #4b#                <- alt chain
   //                          |                       |
   //                          +-----------------------+                          PoS block 3b uses as stake an output, created in current alt chain (2a)
diff --git a/tests/core_tests/tx_validation.cpp b/tests/core_tests/tx_validation.cpp
index 83109915..cb202875 100644
--- a/tests/core_tests/tx_validation.cpp
+++ b/tests/core_tests/tx_validation.cpp
@@ -1379,7 +1379,7 @@ bool tx_expiration_time_and_chain_switching::generate(std::vector<test_event_ent
   //  0 ... 20    21    22    23    24          <- height
   // (0 )- (0r)- (1 )-                          <- chain A
   //         |   tx_1
-  //          \
+  //          \ 
   //           \ (1b)- (2b)-                    <- chain B (became main after 2b)
   //                              
   MAKE_NEXT_BLOCK(events, blk_1b, blk_0r, miner_acc);
@@ -1393,7 +1393,7 @@ bool tx_expiration_time_and_chain_switching::generate(std::vector<test_event_ent
   //  0 ... 20    21    22    23    24          <- height
   // (0 )- (0r)- (1 )-                          <- chain A
   //         |   tx_1
-  //          \
+  //          \ 
   //           \ (1b)- (2b)- !3b!-              <- chain B, block 3b is rejected because tx_1 is already expired
   //                         tx_1 
 
@@ -1411,7 +1411,7 @@ bool tx_expiration_time_and_chain_switching::generate(std::vector<test_event_ent
   //  0 ... 20    21    22    23    24          <- height
   // (0 )- (0r)- (1 )-                          <- chain A
   //         |   tx_1
-  //         |\
+  //         |\ 
   //         | \ (1b)- (2b)-                    <- chain B
   //         |                    
   //          \- (1c)- (2c)- (3c)-              <- chain C
@@ -1432,7 +1432,7 @@ bool tx_expiration_time_and_chain_switching::generate(std::vector<test_event_ent
   //  0 ... 20    21    22    23    24          <- height
   // (0 )- (0r)- (1 )-                          <- chain A
   //         |   tx_1
-  //         |\
+  //         |\ 
   //         | \ (1b)- (2b)- (3b)- (4b)-        <- chain B
   //         |                    
   //          \- (1c)- (2c)- (3c)-              <- chain C