diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 86d4c6beb..37fa8dced 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -28,6 +28,7 @@
 #define ZSTD_STATIC_LINKING_ONLY   /* ZSTD_compressContinue, ZSTD_compressBlock */
 #include "zstd.h"         /* ZSTD_VERSION_STRING */
 #include "zstd_errors.h"  /* ZSTD_getErrorCode */
+#define ZDICT_STATIC_LINKING_ONLY
 #include "zdict.h"        /* ZDICT_trainFromBuffer */
 #include "datagen.h"      /* RDG_genBuffer */
 #include "mem.h"
@@ -317,6 +318,61 @@ static int basicUnitTests(U32 seed, double compressibility)
         free(samplesSizes);
     }
 
+    /* COVER dictionary builder tests */
+    {   ZSTD_CCtx* const cctx = ZSTD_createCCtx();
+        ZSTD_DCtx* const dctx = ZSTD_createDCtx();
+        size_t dictSize = 16 KB;
+        size_t optDictSize = dictSize;
+        void* dictBuffer = malloc(dictSize);
+        size_t const totalSampleSize = 1 MB;
+        size_t const sampleUnitSize = 8 KB;
+        U32 const nbSamples = (U32)(totalSampleSize / sampleUnitSize);
+        size_t* const samplesSizes = (size_t*) malloc(nbSamples * sizeof(size_t));
+        COVER_params_t params;
+        U32 dictID;
+
+        if (dictBuffer==NULL || samplesSizes==NULL) {
+            free(dictBuffer);
+            free(samplesSizes);
+            goto _output_error;
+        }
+
+        DISPLAYLEVEL(4, "test%3i : COVER_trainFromBuffer : ", testNb++);
+        { U32 u; for (u=0; u<nbSamples; u++) samplesSizes[u] = sampleUnitSize; }
+        memset(&params, 0, sizeof(params));
+        params.d = 1 + (FUZ_rand(&seed) % 16);
+        params.k = params.d + (FUZ_rand(&seed) % 256);
+        dictSize = COVER_trainFromBuffer(dictBuffer, dictSize,
+                                         CNBuffer, samplesSizes, nbSamples,
+                                         params);
+        if (ZDICT_isError(dictSize)) goto _output_error;
+        DISPLAYLEVEL(4, "OK, created dictionary of size %u \n", (U32)dictSize);
+
+        DISPLAYLEVEL(4, "test%3i : check dictID : ", testNb++);
+        dictID = ZDICT_getDictID(dictBuffer, dictSize);
+        if (dictID==0) goto _output_error;
+        DISPLAYLEVEL(4, "OK : %u \n", dictID);
+
+        DISPLAYLEVEL(4, "test%3i : COVER_optimizeTrainFromBuffer : ", testNb++);
+        memset(&params, 0, sizeof(params));
+        params.steps = 4;
+        optDictSize = COVER_optimizeTrainFromBuffer(dictBuffer, optDictSize,
+                                                    CNBuffer, samplesSizes, nbSamples,
+                                                    &params);
+        if (ZDICT_isError(optDictSize)) goto _output_error;
+        DISPLAYLEVEL(4, "OK, created dictionary of size %u \n", (U32)optDictSize);
+
+        DISPLAYLEVEL(4, "test%3i : check dictID : ", testNb++);
+        dictID = ZDICT_getDictID(dictBuffer, optDictSize);
+        if (dictID==0) goto _output_error;
+        DISPLAYLEVEL(4, "OK : %u \n", dictID);
+
+        ZSTD_freeCCtx(cctx);
+        ZSTD_freeDCtx(dctx);
+        free(dictBuffer);
+        free(samplesSizes);
+    }
+
     /* Decompression defense tests */
     DISPLAYLEVEL(4, "test%3i : Check input length for magic number : ", testNb++);
     { size_t const r = ZSTD_decompress(decodedBuffer, CNBuffSize, CNBuffer, 3);