diff --git a/tests/basic_test.c b/tests/basic_test.c
new file mode 100644
index 0000000..d58dbe6
--- /dev/null
+++ b/tests/basic_test.c
@@ -0,0 +1,129 @@
+#include <stdio.h>
+#include <string.h>
+#define __USE_XOPEN_EXTENDED
+#include <ftw.h>
+#include "../src/collocatordb.h"
+#include "acutest.h"
+
+char dbpath[] = "../tests/data/wpd19_10000";
+const int testword = 10; // ist
+
+void test_open_db() {
+  COLLOCATORDB *cdb;
+
+  cdb = open_collocatordb(dbpath);
+  TEST_ASSERT(cdb != NULL);
+}
+
+void test_get_word() {
+  COLLOCATORDB *cdb;
+
+  cdb = open_collocatordb(dbpath);
+  TEST_ASSERT(cdb != NULL);
+  char *word = get_word(cdb, testword);
+  char *expected = "ist";
+  TEST_CHECK(strcmp(word, expected) == 0);
+  TEST_MSG("Expected: %s", expected);
+  TEST_MSG("Produced: %s", word);
+}
+
+void test_collocation_scores() {
+  COLLOCATORDB *cdb;
+
+  cdb = open_collocatordb(dbpath);
+  TEST_ASSERT(cdb != NULL);
+  char *expected = " { \"f1\": 217,\"w1\":\"Aluminium\", \"N\": 152744, \"collocates\": [{\"word\":\"Anwendungstechnologie\",\"f2\":16,\"f\":16,\"npmi\":0.594849,\"pmi\":8.4592,\"llr\":188.227,\"lfmd\":16.4592,\"md\":12.4592,\"dice\":0.0711111,\"ld\":10.1862,\"ln_count\":16,\"rn_count\":0,\"ln_pmi\":9.4592,\"rn_pmi\":-1,\"ldaf\":11.1358,\"win\":32,\"afwin\":32}]}\n";
+  char *produced = get_collocation_scores_as_json(cdb, 62, 966);
+  TEST_CHECK(strcmp(produced, expected) == 0);
+  TEST_MSG("Expected: %s", expected);
+  TEST_MSG("Produced: %s", produced);
+}
+
+
+void test_collocation_analysis_as_json() {
+  COLLOCATORDB *cdb;
+
+  cdb = open_collocatordb(dbpath);
+  TEST_ASSERT(cdb != NULL);
+  char *json = get_collocators_as_json(cdb, testword);
+  char *needle = "\"word\":\"um\",\"f2\":264,\"f\":5,\"npmi\":-0.0556343,\"pmi\":-0.958064,\"llr\":2.87717,\"lfmd\":3.68579,\"md\":1.36386,\"dice\":0.00169952,\"ld\":4.79935,\"ln_count\":0,\"rn_count\":1,\"ln_pmi\":-1,\"rn_pmi\":-1,\"ldaf\":4.79935,\"win\":668,\"afwin\":668";
+  TEST_CHECK(strstr(json, needle) > 0);
+  TEST_MSG("Expected to contain: %s", needle);
+  const COLLOCATOR *c = get_collocators(cdb, 62);
+  printf("%s %lu\n", get_word(cdb,c[0].w2), c[0].f2);
+}
+
+void test_collocation_analysis() {
+  COLLOCATORDB *cdb;
+
+  cdb = open_collocatordb(dbpath);
+  TEST_ASSERT(cdb != NULL);
+  char *expected = "Anwendungstechnologie";
+  const COLLOCATOR *c = get_collocators(cdb, 62);
+  char *produced = get_word(cdb,c[0].w2);
+  TEST_CHECK(strcmp(produced, expected) == 0);
+  TEST_MSG("Expected: %s", expected);
+  TEST_MSG("Produced: %s", produced);
+  printf("%s\n", get_collocators_as_json(cdb,62));
+
+}
+
+int unlink_cb(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
+  int rv = remove(fpath);
+  if (rv)
+    perror(fpath);
+  return rv;
+}
+
+int rmrf(char *path) {
+  return nftw(path, unlink_cb, 64, FTW_DEPTH | FTW_PHYS);
+}
+
+void test_writing() {
+  char *tmp = tempnam(NULL, NULL);
+  long size = 0;
+
+  printf("%s\n", acutest_argv0_);
+
+  char *rocksdbfn = malloc(strlen(tmp)+strlen(".rocksdb"));
+  strcpy (rocksdbfn, tmp);
+  strcat(rocksdbfn, ".rocksdb");
+  COLLOCATORDB *cdb = open_collocatordb_for_write(rocksdbfn);
+
+  char *vocabfn = malloc(strlen(tmp)+strlen(".vocab"));
+  strcpy(vocabfn, tmp);
+  strcat(vocabfn, ".vocab");
+  FILE *h = fopen(vocabfn, "w");
+  fprintf(h, "word0 2000\n");
+  fprintf(h, "word1 2000\n");
+  fprintf(h, "word2 2000\n");
+  fclose(h);
+  read_vocab(cdb, vocabfn);
+  inc_collocator(cdb, 0, 1, 4); size++;
+  for (int i=0; i < 1000; i++) {
+    inc_collocator(cdb, 0, 1, i % 5); size++;
+    inc_collocator(cdb, 0, 1, -i % 5); size++;
+    inc_collocator(cdb, 1, 0, i % 5); size++;
+    inc_collocator(cdb, 1, 0, -i % 5); size++;
+    inc_collocator(cdb, 0, 2, i % 5); size++;
+    inc_collocator(cdb, 0, 2, -i % 5); size++;
+  }
+  inc_collocator(cdb, 1, 2, 4); size++;
+  COLLOCATOR *c = get_collocators(cdb, 0);
+  TEST_ASSERT(c != NULL);
+  TEST_CHECK(c[0].raw == 2001);
+  TEST_CHECK(c[0].left_raw == 200);
+  TEST_CHECK(c[0].right_raw == 200);
+
+  rmrf(rocksdbfn);
+}
+
+TEST_LIST = {
+    { "open database for reading", test_open_db },
+    { "get word", test_get_word },
+    { "collocation scores", test_collocation_scores },
+    { "collocation analysis", test_collocation_analysis },
+    { "collocation analysis as json", test_collocation_analysis_as_json },
+    { "writing", test_writing },
+    { NULL, NULL }
+};