diff --git a/influxdb.cabal b/influxdb.cabal
index 965150f..7b66db7 100644
--- a/influxdb.cabal
+++ b/influxdb.cabal
@@ -115,10 +115,12 @@ test-suite regressions
       base
     , containers
     , influxdb
+    , lens
     , tasty
     , tasty-hunit
     , time
     , raw-strings-qq >= 1.1 && < 1.2
+    , vector
   ghc-options: -Wall -threaded
   hs-source-dirs: tests
   default-language: Haskell2010
diff --git a/tests/regressions.hs b/tests/regressions.hs
index 542a470..11fafe5 100644
--- a/tests/regressions.hs
+++ b/tests/regressions.hs
@@ -1,34 +1,79 @@
+{-# LANGUAGE DataKinds #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
-import Data.Time.Clock (UTCTime)
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TemplateHaskell #-}
+import Control.Exception (bracket_, try)
+
+import Control.Lens
+import Data.Time
 import Test.Tasty
 import Test.Tasty.HUnit
-import Text.RawString.QQ (r)
 import qualified Data.Map as M
+import qualified Data.Map.Strict as Map
+import qualified Data.Vector as V
+import qualified Text.RawString.QQ as Raw (r)
 
 import Database.InfluxDB
 import Database.InfluxDB.Line
 import qualified Database.InfluxDB.Format as F
 
 main :: IO ()
-main = defaultMain tests
-
-tests :: TestTree
-tests = testGroup "regression tests"
-  [ issue75
+main = defaultMain $ testGroup "regression tests"
+  [ testCase "issue #64" case_issue64
+  , testCase "issue #66" case_issue66
+  , testCaseSteps "issue #75" case_issue75
   ]
 
--- https://github.com/maoe/influxdb-haskell/issues/75
+-- https://github.com/maoe/influxdb-haskell/issues/64
+case_issue64 :: Assertion
+case_issue64 = withDatabase dbName $ do
+  write wp $ Line "count" Map.empty
+    (Map.fromList [("value", FieldInt 1)])
+    (Nothing :: Maybe UTCTime)
+  r <- try $ query qp "SELECT value FROM count"
+  case r of
+    Left err -> case err of
+      UnexpectedResponse message _ _ ->
+        message @?=
+          "BUG: parsing Int failed, expected Number, but encountered String in Database.InfluxDB.Query.query"
+      _ ->
+        assertFailure $ got ++ show err
+    Right (v :: (V.Vector (Tagged "time" Int, Tagged "value" Int))) ->
+      -- NOTE: The time columns should be UTCTime, Text, or String
+      assertFailure $ got ++ "no errors: " ++ show v
+  where
+    dbName = "case_issue64"
+    qp = queryParams dbName & precision .~ RFC3339
+    wp = writeParams dbName
+    got = "expeted an UnexpectedResponse but got "
 
-issue75 :: TestTree
-issue75 = testCaseSteps "issue #75" $ \step -> do
+-- https://github.com/maoe/influxdb-haskell/issues/66
+case_issue66 :: Assertion
+case_issue66 = do
+  r <- try $ query (queryParams "_internal") "SELECT time FROM dummy"
+  case r of
+    Left err -> case err of
+      UnexpectedResponse message _ _ ->
+        message @?=
+          "BUG: at least 1 non-time field must be queried in Database.InfluxDB.Query.query"
+      _ ->
+        assertFailure $ got ++ show err
+    Right (v :: V.Vector (Tagged "time" Int)) ->
+      assertFailure $ got ++ "no errors: " ++ show v
+  where
+    got = "expected an UnexpectedResponse but got "
+
+-- https://github.com/maoe/influxdb-haskell/issues/75
+case_issue75 :: (String -> IO ()) -> Assertion
+case_issue75 step = do
   step "Checking encoded value"
-  let string = [r|bl\"a|]
+  let string = [Raw.r|bl\"a|]
   let encoded = encodeLine (scaleTo Nanosecond)
         $ Line "testing" mempty
           (M.singleton "test" $ FieldString string)
           (Nothing :: Maybe UTCTime)
-  encoded @?= [r|testing test="bl\\\"a"|]
+  encoded @?= [Raw.r|testing test="bl\\\"a"|]
 
   step "Preparing a test database"
   let db = "issue75"
@@ -39,3 +84,11 @@ issue75 = testCaseSteps "issue #75" $ \step -> do
   step "Checking server response"
   let wp = writeParams db
   writeByteString wp encoded
+
+withDatabase :: Database -> IO a -> IO a
+withDatabase dbName f = bracket_
+  (manage q (formatQuery ("CREATE DATABASE "%F.database) dbName))
+  (manage q (formatQuery ("DROP DATABASE "%F.database) dbName))
+  f
+  where
+    q = queryParams dbName