diff --git a/checkers/check_crc32c.c b/checkers/check_crc32c.c
new file mode 100644
index 0000000..4eca8f1
--- /dev/null
+++ b/checkers/check_crc32c.c
@@ -0,0 +1,9 @@
+#include <crc32c/crc32c.h>
+
+int main(int argc, char** argv)
+{
+  char* buffer;
+  size_t size;
+  ::crc32c::Extend(0, buffer, size);
+  return 0;
+}
diff --git a/tests/compileme.c b/checkers/check_fdatasync.c
similarity index 98%
rename from tests/compileme.c
rename to checkers/check_fdatasync.c
index d756ad7..63d1ed1 100644
--- a/tests/compileme.c
+++ b/checkers/check_fdatasync.c
@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   fdatasync(-1);
   return 0;
 }
-
diff --git a/tests/compileme2.c b/checkers/check_fullfsync.c
similarity index 98%
rename from tests/compileme2.c
rename to checkers/check_fullfsync.c
index e44c0ab..7632eed 100644
--- a/tests/compileme2.c
+++ b/checkers/check_fullfsync.c
@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   int i = F_FULLSYNC;
   return 0;
 }
-
diff --git a/tests/compileme3.c b/checkers/check_ocloexec.c
similarity index 98%
rename from tests/compileme3.c
rename to checkers/check_ocloexec.c
index e4d5988..c719871 100644
--- a/tests/compileme3.c
+++ b/checkers/check_ocloexec.c
@@ -5,4 +5,3 @@ int main(int argc, char** argv)
   int i = O_CLOEXEC;
   return 0;
 }
-
diff --git a/checkers/check_snappy.c b/checkers/check_snappy.c
new file mode 100644
index 0000000..21b8111
--- /dev/null
+++ b/checkers/check_snappy.c
@@ -0,0 +1,10 @@
+#include <snappy.h>
+
+int main(int argc, char** argv)
+{
+  char* input;
+  size_t length;
+  size_t result;
+  snappy::GetUncompressedLength(input, length, &result);
+  return 0;
+}
diff --git a/checkers/check_zstd.c b/checkers/check_zstd.c
new file mode 100644
index 0000000..837cdb0
--- /dev/null
+++ b/checkers/check_zstd.c
@@ -0,0 +1,8 @@
+#include <zstd.h>
+
+int main(int argc, char** argv)
+{
+  size_t length;
+  ZSTD_compressBound(length);
+  return 0;
+}
diff --git a/leveldbstatic/prelude.nim b/leveldbstatic/prelude.nim
index 82223b5..377685c 100644
--- a/leveldbstatic/prelude.nim
+++ b/leveldbstatic/prelude.nim
@@ -3,6 +3,7 @@ import os
 const root = currentSourcePath.parentDir.parentDir
 const envWindows = root/"vendor"/"util"/"env_windows.cc"
 const envPosix = root/"vendor"/"util"/"env_posix.cc"
+const checkers = root/"checkers"
 
 when defined(windows):
   {.compile: envWindows.}
@@ -15,11 +16,18 @@ when defined(posix):
   {.passc: "-DLEVELDB_PLATFORM_POSIX".}
 
 
-{.passc: "-DHAVE_FDATASYNC=0".}
-{.passc: "-DHAVE_FULLFSYNC=0".}
-{.passc: "-DHAVE_O_CLOEXEC=0".}
-{.passc: "-DHAVE_CRC32C=0".}
-{.passc: "-DHAVE_SNAPPY=0".}
-{.passc: "-DHAVE_ZSTD=0".}
-{.passc: "-DHAVE_Zstd=0".}
+static:
+  proc doesCompile(cfile: string): int =
+    let rv = gorgeEx("gcc " & cfile)
+    if rv[1] == 0:
+      return 1
+    return 0
+
+  {.passc: "-DHAVE_FDATASYNC=" & $doesCompile(checkers/"check_fdatasync.c").}
+  {.passc: "-DHAVE_FULLFSYNC=" & $doesCompile(checkers/"check_fullfsync.c").}
+  {.passc: "-DHAVE_O_CLOEXEC=" & $doesCompile(checkers/"check_ocloexec.c").}
+  {.passc: "-DHAVE_CRC32C=" & $doesCompile(checkers/"check_crc32c.c").}
+  {.passc: "-DHAVE_SNAPPY=" & $doesCompile(checkers/"check_snappy.c").}
+  {.passc: "-DHAVE_ZSTD=" & $doesCompile(checkers/"check_zstd.c").}
+  {.passc: "-DHAVE_Zstd=" & $doesCompile(checkers/"check_zstd.c").}
 
diff --git a/tests/test.nim b/tests/test.nim
index 438a408..858e993 100644
--- a/tests/test.nim
+++ b/tests/test.nim
@@ -2,38 +2,374 @@ import unittest, options, os, osproc, sequtils, strutils
 import leveldbstatic as leveldb
 import leveldbstatic/raw
 
-suite "checking":
-  test "A!":
-    echo "A!"
+const
+  tmpDir = getTempDir() / "testleveldb"
+  tmpNimbleDir = tmpDir / "nimble"
+  tmpDbDir = tmpDir / "testdb"
 
-    when sizeof(int) == 8:
-      echo "int = 8"
-    else:
-      echo "int is not 8"
+template cd*(dir: string, body: untyped) =
+  ## Sets the current dir to ``dir``, executes ``body`` and restores the
+  ## previous working dir.
+  block:
+    let lastDir = getCurrentDir()
+    setCurrentDir(dir)
+    body
+    setCurrentDir(lastDir)
 
-    when defined(fdatasync):
-      echo "yes fdatasync"
-    else:
-      echo "no fdatasync"
+proc execNimble(args: varargs[string]): tuple[output: string, exitCode: int] =
+  var quotedArgs = @args
+  quotedArgs.insert("-y")
+  quotedArgs.insert("--nimbleDir:" & tmpNimbleDir)
+  quotedArgs.insert("nimble")
+  quotedArgs = quotedArgs.map(proc (x: string): string = "\"" & x & "\"")
 
-    when defined(F_FULLFSYNC):
-      echo "yes full"
-    else:
-      echo "no full"
+  let cmd = quotedArgs.join(" ")
+  result = execCmdEx(cmd)
+  checkpoint(cmd)
+  checkpoint(result.output)
 
-    when defined(O_CLOEXEC):
-      echo "yes oclo"
-    else:
-      echo "no oclo"
+proc execTool(args: varargs[string]): tuple[output: string, exitCode: int] =
+  var quotedArgs = @args
+  quotedArgs.insert(tmpDbDir)
+  quotedArgs.insert("--database")
+  quotedArgs.insert(findExe(tmpNimbleDir / "bin" / "leveldbtool"))
+  quotedArgs = quotedArgs.map(proc (x: string): string = "\"" & x & "\"")
 
-    static:
-      proc doesCompile(cfile: string): bool =
-        # static:
-        let rv = gorgeEx("gcc " & cfile)
-        echo rv[0]
-        return rv[1] == 0
+  if not dirExists(tmpDbDir):
+    createDir(tmpDbDir)
 
-      echo "compileme.c: " & $doesCompile("compileme.c")
-      echo "compileme2.c: " & $doesCompile("compileme2.c")
-      echo "compileme3.c: " & $doesCompile("compileme3.c")
+  let cmd = quotedArgs.join(" ")
+  result = execCmdEx(cmd)
+  checkpoint(cmd)
+  checkpoint(result.output)
 
+suite "leveldb":
+
+  setup:
+    let env = leveldb_create_default_env()
+    let dbName = $(leveldb_env_get_test_directory(env))
+    let db = leveldb.open(dbName)
+
+  teardown:
+    db.close()
+    removeDb(dbName)
+
+  test "version":
+    let (major, minor) = getLibVersion()
+    check(major > 0)
+    check(minor > 0)
+
+  test "get nothing":
+    check(db.get("nothing") == none(string))
+
+  test "put and get":
+    db.put("hello", "world")
+    check(db.get("hello") == some("world"))
+
+  test "get or default":
+    check(db.getOrDefault("nothing", "yes") == "yes")
+
+  test "delete":
+    db.put("hello", "world")
+    db.delete("hello")
+    check(db.get("hello") == none(string))
+
+  test "get value with 0x00":
+    db.put("\0key", "\0ff")
+    check(db.get("\0key") == some("\0ff"))
+
+  test "get empty value":
+    db.put("a", "")
+    check(db.get("a") == some(""))
+
+  test "get empty key":
+    db.put("", "a")
+    check(db.get("") == some("a"))
+
+  proc initData(db: LevelDb) =
+    db.put("aa", "1")
+    db.put("ba", "2")
+    db.put("bb", "3")
+
+  test "iter":
+    initData(db)
+    check(toSeq(db.iter()) == @[("aa", "1"), ("ba", "2"), ("bb", "3")])
+
+  test "iter reverse":
+    initData(db)
+    check(toSeq(db.iter(reverse = true)) ==
+          @[("bb", "3"), ("ba", "2"), ("aa", "1")])
+
+  test "iter seek":
+    initData(db)
+    check(toSeq(db.iter(seek = "ab")) ==
+          @[("ba", "2"), ("bb", "3")])
+
+  test "iter seek reverse":
+    initData(db)
+    check(toSeq(db.iter(seek = "ab", reverse = true)) ==
+          @[("ba", "2"), ("aa", "1")])
+
+  test "iter prefix":
+    initData(db)
+    check(toSeq(db.iterPrefix(prefix = "b")) ==
+          @[("ba", "2"), ("bb", "3")])
+
+  test "iter range":
+    initData(db)
+    check(toSeq(db.iterRange(start = "a", limit = "ba")) ==
+          @[("aa", "1"), ("ba", "2")])
+
+  test "iter range reverse":
+    initData(db)
+    check(toSeq(db.iterRange(start = "bb", limit = "b")) ==
+          @[("bb", "3"), ("ba", "2")])
+
+  test "iter with 0x00":
+    db.put("\0z1", "\0ff")
+    db.put("z2\0", "ff\0")
+    check(toSeq(db.iter()) == @[("\0z1", "\0ff"), ("z2\0", "ff\0")])
+
+  test "iter empty value":
+    db.put("a", "")
+    check(toSeq(db.iter()) == @[("a", "")])
+
+  test "iter empty key":
+    db.put("", "a")
+    check(toSeq(db.iter()) == @[("", "a")])
+
+  test "repair database":
+    initData(db)
+    db.close()
+    repairDb(dbName)
+
+  test "batch":
+    db.put("a", "1")
+    db.put("b", "2")
+    let batch = newBatch()
+    batch.put("a", "10")
+    batch.put("c", "30")
+    batch.delete("b")
+    db.write(batch)
+    check(toSeq(db.iter()) == @[("a", "10"), ("c", "30")])
+
+  test "batch append":
+    let batch = newBatch()
+    let batch2 = newBatch()
+    batch.put("a", "1")
+    batch2.put("b", "2")
+    batch2.delete("a")
+    batch.append(batch2)
+    db.write(batch)
+    check(toSeq(db.iter()) == @[("b", "2")])
+
+  test "batch clear":
+    let batch = newBatch()
+    batch.put("a", "1")
+    batch.clear()
+    batch.put("b", "2")
+    db.write(batch)
+    check(toSeq(db.iter()) == @[("b", "2")])
+
+  test "open with cache":
+    let ldb = leveldb.open(dbName & "-cache", cacheCapacity = 100000)
+    defer:
+      ldb.close()
+      removeDb(ldb.path)
+    ldb.put("a", "1")
+    check(toSeq(ldb.iter()) == @[("a", "1")])
+
+  test "open but no create":
+    expect LevelDbException:
+      let failed = leveldb.open(dbName & "-nocreate", create = false)
+      defer:
+        failed.close()
+        removeDb(failed.path)
+
+  test "open but no reuse":
+    let old = leveldb.open(dbName & "-noreuse", reuse = true)
+    defer:
+      old.close()
+      removeDb(old.path)
+
+    expect LevelDbException:
+      let failed = leveldb.open(old.path, reuse = false)
+      defer:
+        failed.close()
+        removeDb(failed.path)
+
+  test "no compress":
+    db.close()
+    let nc = leveldb.open(dbName, compressionType = ctNoCompression)
+    defer: nc.close()
+    nc.put("a", "1")
+    check(toSeq(nc.iter()) == @[("a", "1")])
+
+suite "leveldb queryIter":
+
+  setup:
+    let env = leveldb_create_default_env()
+    let dbName = $(leveldb_env_get_test_directory(env))
+    let db = leveldb.open(dbName)
+    let
+      k1 = "k1"
+      k2 = "k2"
+      k3 = "l3"
+      v1 = "v1"
+      v2 = "v2"
+      v3 = "v3"
+      empty = ("", "")
+
+    db.put(k1, v1)
+    db.put(k2, v2)
+    db.put(k3, v3)
+
+  teardown:
+    db.close()
+    removeDb(dbName)
+
+  test "iterates all keys and values":
+    let iter = db.queryIter()
+    check:
+      not iter.finished
+      iter.next() == (k1, v1)
+      not iter.finished
+      iter.next() == (k2, v2)
+      not iter.finished
+      iter.next() == (k3, v3)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+    
+  test "skip":
+    let iter = db.queryIter(skip = 1)
+    check:
+      not iter.finished
+      iter.next() == (k2, v2)
+      not iter.finished
+      iter.next() == (k3, v3)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "limit":
+    let iter = db.queryIter(limit = 2)
+    check:
+      not iter.finished
+      iter.next() == (k1, v1)
+      not iter.finished
+      iter.next() == (k2, v2)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "iterates only keys":
+    let iter = db.queryIter(keysOnly = true)
+    check:
+      not iter.finished
+      iter.next() == (k1, "")
+      not iter.finished
+      iter.next() == (k2, "")
+      not iter.finished
+      iter.next() == (k3, "")
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "iterates only 'k', both keys and values":
+    let iter = db.queryIter(prefix = "k")
+    check:
+      not iter.finished
+      iter.next() == (k1, v1)
+      not iter.finished
+      iter.next() == (k2, v2)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "iterates only 'k', skip":
+    let iter = db.queryIter(prefix = "k", skip = 1)
+    check:
+      not iter.finished
+      iter.next() == (k2, v2)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "iterate only 'k', limit":
+    let iter = db.queryIter(prefix = "k", limit = 1)
+    check:
+      not iter.finished
+      iter.next() == (k1, v1)
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+  test "iterates only 'k', only keys":
+    let iter = db.queryIter(prefix = "k", keysOnly = true)
+    check:
+      not iter.finished
+      iter.next() == (k1, "")
+      not iter.finished
+      iter.next() == (k2, "")
+      not iter.finished
+      iter.next() == empty
+      iter.finished
+
+suite "package":
+
+  setup:
+    removeDir(tmpDir)
+
+  test "import as package":
+    let (output, exitCode) = execNimble("install")
+    check exitCode == QuitSuccess
+    check output.contains("leveldbstatic installed successfully.")
+
+    cd "tests"/"packagetest":
+      var (output, exitCode) = execNimble("build")
+      check exitCode == QuitSuccess
+      check output.contains("Building")
+
+      (output, exitCode) = execCmdEx("./packagetest")
+      checkpoint output
+      check exitCode == QuitSuccess
+      check output.contains("leveldb works.")
+
+suite "tool":
+
+  setup:
+    removeDir(tmpDir)
+
+  test "leveldb tool":
+    var (output, exitCode) = execNimble("install")
+    check exitCode == QuitSuccess
+    check output.contains("Building")
+
+    check execTool("-v").exitCode == QuitSuccess
+    check execTool("create").exitCode == QuitSuccess
+    check execTool("list").exitCode == QuitSuccess
+
+    check execTool("put", "hello", "world").exitCode == QuitSuccess
+    (output, exitCode) = execTool("get", "hello")
+    check exitCode == QuitSuccess
+    check output == "world\L"
+    (output, exitCode) = execTool("list")
+    check exitCode == QuitSuccess
+    check output == "hello world\L"
+
+    check execTool("delete", "hello").exitCode == QuitSuccess
+    (output, exitCode) = execTool("get", "hello")
+    check exitCode == QuitSuccess
+    check output == ""
+    (output, exitCode) = execTool("list")
+    check exitCode == QuitSuccess
+    check output == ""
+
+    check execTool("put", "hello", "6130", "-x").exitCode == QuitSuccess
+    check execTool("get", "hello", "-x").output == "6130\L"
+    check execTool("get", "hello").output == "a0\L"
+    check execTool("list", "-x").output == "hello 6130\L"
+    check execTool("put", "hello", "0061", "-x").exitCode == QuitSuccess
+    check execTool("get", "hello", "-x").output == "0061\L"
+    check execTool("delete", "hello").exitCode == QuitSuccess