[Trivial] Grammar and typo correction

Minor corrections in src\test\* .

src/test/cuckoocache_tests.cpp

@@ -15,7 +15,7 @@
  *  with deterministic seeds)
  *  2) Some test methods are templated to allow for easier testing
  *  against new versions / comparing
- *  3) Results should be treated as a regression test, ie, did the behavior
+ *  3) Results should be treated as a regression test, i.e., did the behavior
  *  change significantly from what was expected. This can be OK, depending on
  *  the nature of the change, but requires updating the tests to reflect the new
  *  expected behavior. For example improving the hit rate may cause some tests

src/test/dbwrapper_tests.cpp

@@ -76,7 +76,7 @@ BOOST_AUTO_TEST_CASE(dbwrapper_batch)
         BOOST_CHECK(dbw.Read(key2, res));
         BOOST_CHECK_EQUAL(res.ToString(), in2.ToString());
 
-        // key3 never should've been written
+        // key3 should've never been written
         BOOST_CHECK(dbw.Read(key3, res) == false);
     }
 }

src/test/limitedmap_tests.cpp

@@ -27,7 +27,7 @@ BOOST_AUTO_TEST_CASE(limitedmap_test)
     // make sure that the size is updated
     BOOST_CHECK(map.size() == 1);
 
-    // make sure that the new items is in the map
+    // make sure that the new item is in the map
     BOOST_CHECK(map.count(-1) == 1);
 
     // insert 10 new items

src/test/scheduler_tests.cpp

@@ -47,8 +47,8 @@ BOOST_AUTO_TEST_CASE(manythreads)
     //
     // So... ten shared counters, which if all the tasks execute
     // properly will sum to the number of tasks done.
-    // Each task adds or subtracts from one of the counters a
-    // random amount, and then schedules another task 0-1000
+    // Each task adds or subtracts a random amount from one of the
+    // counters, and then schedules another task 0-1000
     // microseconds in the future to subtract or add from
     // the counter -random_amount+1, so in the end the shared
     // counters should sum to the number of initial tasks performed.

src/test/script_tests.cpp

@@ -465,7 +465,7 @@ public:
 std::string JSONPrettyPrint(const UniValue& univalue)
 {
     std::string ret = univalue.write(4);
-    // Workaround for libunivalue pretty printer, which puts a space between comma's and newlines
+    // Workaround for libunivalue pretty printer, which puts a space between commas and newlines
     size_t pos = 0;
     while ((pos = ret.find(" \n", pos)) != std::string::npos) {
         ret.replace(pos, 2, "\n");

src/test/test_bitcoin.cpp

@@ -147,7 +147,7 @@ CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CMutableTransaction &tx, CT
 }
 
 CTxMemPoolEntry TestMemPoolEntryHelper::FromTx(const CTransaction &txn, CTxMemPool *pool) {
-    // Hack to assume either its completely dependent on other mempool txs or not at all
+    // Hack to assume either it's completely dependent on other mempool txs or not at all
     CAmount inChainValue = pool && pool->HasNoInputsOf(txn) ? txn.GetValueOut() : 0;
 
     return CTxMemPoolEntry(MakeTransactionRef(txn), nFee, nTime, dPriority, nHeight,