diff --git a/Makefile b/Makefile
index 29a579bd5..6072ba1ed 100644
--- a/Makefile
+++ b/Makefile
@@ -17,15 +17,21 @@ CROSS_COMPILE	?= arm-none-eabi-
 OBJ_DIR = obj
 OUT_DIR = ./out
 
+MAIN_MODULE_SRC = ./src/main.c
+UNITTESTS_SRC_DIR = ./tests/unit
+
+# FIXME:
+#  Place jerry-libc.c, pretty-printer.c to some subdirectory (libruntime?)
+#  and add them to the SOURCES list through wildcard.
 SOURCES = \
 	$(sort \
-	$(wildcard ./src/*.c) \
+	$(wildcard ./src/jerry-libc.c ./src/pretty-printer.c) \
 	$(wildcard ./src/libperipherals/*.c) \
 	$(wildcard ./src/libjsparser/*.c) \
 	$(wildcard ./src/libecmaobjects/*.c) \
 	$(wildcard ./src/liballocator/*.c) \
 	$(wildcard ./src/libcoreint/*.c) )
-	
+
 HEADERS = \
 	$(sort \
 	$(wildcard ./src/*.h) \
@@ -43,9 +49,14 @@ INCLUDES = \
 	-I src/liballocator \
 	-I src/libcoreint
 
+UNITTESTS = \
+	$(sort \
+	$(patsubst %.c,%,$(notdir \
+	$(wildcard $(UNITTESTS_SRC_DIR)/*))))
+
 OBJS = \
 	$(sort \
-	$(patsubst %.c,./$(OBJ_DIR)/%.o,$(notdir $(SOURCES))))
+	$(patsubst %.c,./$(OBJ_DIR)/%.o,$(notdir $(MAIN_MODULE_SRC) $(SOURCES))))
 
 CC  = gcc#-4.9
 LD  = ld
@@ -79,21 +90,29 @@ DEFINES = -DMEM_HEAP_CHUNK_SIZE=256 -DMEM_HEAP_AREA_SIZE=32768
 TARGET_HOST = -D__HOST
 TARGET_MCU = -D__MCU
 
-.PHONY: all debug release clean check install
+.PHONY: all debug release clean tests check install
 
 all: clean debug release check
 
 debug:
 	mkdir -p $(OUT_DIR)/debug.host/
 	$(CC) $(CFLAGS) $(DEBUG_OPTIONS) $(DEFINES) $(TARGET_HOST) \
-	$(SOURCES) -o $(OUT_DIR)/debug.host/$(TARGET)
+	$(SOURCES) $(MAIN_MODULE_SRC) -o $(OUT_DIR)/debug.host/$(TARGET)
 
 release:
 	mkdir -p $(OUT_DIR)/release.host/
 	$(CC) $(CFLAGS) $(RELEASE_OPTIONS) $(DEFINES) $(TARGET_HOST) \
-	$(SOURCES) -o $(OUT_DIR)/release.host/$(TARGET)
+	$(SOURCES) $(MAIN_MODULE_SRC) -o $(OUT_DIR)/release.host/$(TARGET)
 	$(STRIP) $(OUT_DIR)/release.host/$(TARGET)
 
+tests:
+	mkdir -p $(OUT_DIR)/tests.host/
+	for unit_test in $(UNITTESTS); \
+	do \
+		$(CC) -O3 $(CFLAGS) $(DEBUG_OPTIONS) $(DEFINES) $(TARGET_HOST) \
+		$(SOURCES) $(UNITTESTS_SRC_DIR)/"$$unit_test".c -o $(OUT_DIR)/tests.host/"$$unit_test"; \
+	done
+
 clean:
 	rm -f $(OBJ_DIR)/*.o *.bin *.o *~ *.log *.log
 	rm -rf $(OUT_DIR)
@@ -104,19 +123,30 @@ clean:
 	rm -f $(TARGET).hex
 	rm -f $(TARGET).lst
 
-check:
-	mkdir -p $(OUT_DIR)
-	cd $(OUT_DIR)
-	cppcheck $(HEADERS) $(SOURCES) --enable=all --std=c99
+check: tests
+	@mkdir -p $(OUT_DIR)
+	@cd $(OUT_DIR)
+
+	@echo "=== Running cppcheck ==="
+	@cppcheck $(HEADERS) $(SOURCES) --enable=all --std=c99
+	@echo Done
+	@echo
 	
-	if [ -f $(OUT_DIR)/release.host/$(TARGET) ]; then \
-	./tools/jerry_test.sh $(OUT_DIR)/release.host/$(TARGET);\
+	@echo "=== Running unit tests ==="
+	./tools/jerry_unittest.sh $(OUT_DIR)/tests.host $(UNITTESTS)
+	@echo Done
+	@echo
+	
+	@echo "=== Running js tests ==="
+	@ if [ -f $(OUT_DIR)/release.host/$(TARGET) ]; then \
+		./tools/jerry_test.sh $(OUT_DIR)/release.host/$(TARGET);\
 	fi
 	
-	if [ -f $(OUT_DIR)/debug.host/$(TARGET) ]; then \
-	./tools/jerry_test.sh $(OUT_DIR)/debug.host/$(TARGET);\
+	@if [ -f $(OUT_DIR)/debug.host/$(TARGET) ]; then \
+		./tools/jerry_test.sh $(OUT_DIR)/debug.host/$(TARGET); \
 	fi
-	
+	@echo Done
+	@echo
 
 install:
 	st-flash write $(TARGET).bin 0x08000000
diff --git a/src/liballocator/mem-poolman.c b/src/liballocator/mem-poolman.c
index c516d6179..6e2b4fe1e 100644
--- a/src/liballocator/mem-poolman.c
+++ b/src/liballocator/mem-poolman.c
@@ -52,21 +52,6 @@ mem_PoolState_t mem_PoolForPoolHeaders;
  */
 uint8_t *mem_SpaceForPoolForPoolHeaders;
 
-/**
- * Get chunk size from chunk type.
- * 
- * @return size (in bytes) of chunk of specified type
- */
-static size_t
-mem_GetChunkSize( mem_PoolChunkType_t chunkType) /**< chunk type */
-{
-    uint32_t chunkTypeId = (uint32_t) chunkType;
-
-    JERRY_ASSERT( chunkTypeId < MEM_POOL_CHUNK_TYPE__COUNT );
-
-    return ( 1u << ( chunkTypeId + 2 ) );
-} /* mem_GetChunkSize */
-
 /**
  * Initialize pool manager
  */
diff --git a/src/liballocator/mem-poolman.h b/src/liballocator/mem-poolman.h
index 2e6acdc3f..0426712dd 100644
--- a/src/liballocator/mem-poolman.h
+++ b/src/liballocator/mem-poolman.h
@@ -49,6 +49,21 @@ typedef enum {
                                         ((size) == 32 ? MEM_POOL_CHUNK_TYPE_32 : \
                                         jerry_UnreferencedExpression))))
 
+/**
+ * Get chunk size from chunk type.
+ * 
+ * @return size (in bytes) of chunk of specified type
+ */
+static inline size_t
+mem_GetChunkSize( mem_PoolChunkType_t chunkType) /**< chunk type */
+{
+    uint32_t chunkTypeId = (uint32_t) chunkType;
+
+    JERRY_ASSERT( chunkTypeId < MEM_POOL_CHUNK_TYPE__COUNT );
+
+    return ( 1u << ( chunkTypeId + 2 ) );
+} /* mem_GetChunkSize */
+
 
 extern void mem_PoolsInit(void);
 extern uint8_t* mem_PoolsAlloc(mem_PoolChunkType_t chunkType);
diff --git a/tests/unit/test_heap.c b/tests/unit/test_heap.c
new file mode 100644
index 000000000..862df96fb
--- /dev/null
+++ b/tests/unit/test_heap.c
@@ -0,0 +1,86 @@
+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "globals.h"
+#include "mem-allocator.h"
+
+extern void srand (unsigned int __seed);
+extern int rand (void);
+extern long int time (long int *__timer);
+extern int printf (__const char *__restrict __format, ...);
+extern void *memset (void *__s, int __c, size_t __n);
+
+// Heap size is 8K
+const size_t test_heap_size = 8 * 1024;
+
+// Iterations count
+const uint32_t test_iters = 1024 * 1024;
+
+// Subiterations count
+const uint32_t test_sub_iters = 3;
+
+// Threshold size of block to allocate
+const uint32_t test_threshold_block_size = 2048;
+
+int
+main( int __unused argc,
+      char __unused **argv)
+{
+    uint8_t test_native_heap[test_heap_size];
+
+    mem_HeapInit( test_native_heap, sizeof (test_native_heap));
+
+    srand((unsigned int) time(NULL));
+    int k = rand();
+    printf("seed=%d\n", k);
+    srand((unsigned int) k);
+
+    mem_HeapPrint( false);
+
+    for ( int i = 0; i < test_iters; i++ )
+    {
+        const int subiters = test_sub_iters;
+        uint8_t * ptrs[subiters];
+        size_t sizes[subiters];
+
+        for ( int j = 0; j < subiters; j++ )
+        {
+            size_t size = (unsigned int) rand() % ( test_threshold_block_size );
+            ptrs[j] = mem_HeapAllocBlock( size, ( rand() % 2 ) ? MEM_HEAP_ALLOC_SHORT_TERM : MEM_HEAP_ALLOC_SHORT_TERM);
+            sizes[j] = size;
+            if ( ptrs[j] != NULL )
+            {
+                memset(ptrs[j], 0, sizes[j]);
+            }
+            // JERRY_ASSERT(ptrs[j] != NULL);
+        }
+
+        // mem_HeapPrint( true);
+
+        for ( int j = 0; j < subiters; j++ )
+        {
+            if ( ptrs[j] != NULL )
+            {
+                for( size_t k = 0; k < sizes[j]; k++ )
+                {
+                    JERRY_ASSERT( ptrs[j][k] == 0 );
+                }
+                mem_HeapFreeBlock( ptrs[j]);
+            }
+        }
+    }
+
+    return 0;
+} /* main */
diff --git a/tests/unit/test_pool.c b/tests/unit/test_pool.c
new file mode 100644
index 000000000..1a7f57d7e
--- /dev/null
+++ b/tests/unit/test_pool.c
@@ -0,0 +1,91 @@
+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define JERRY_MEM_POOL_INTERNAL
+
+#include "globals.h"
+#include "mem-allocator.h"
+#include "mem-pool.h"
+
+extern void srand (unsigned int __seed);
+extern int rand (void);
+extern long int time (long int *__timer);
+extern int printf (__const char *__restrict __format, ...);
+extern void *memset (void *__s, int __c, size_t __n);
+
+// Pool area size is 8K
+const size_t test_pool_area_size = 8 * 1024;
+
+// Iterations count
+const uint32_t test_iters = 64;
+
+// Subiterations count
+const uint32_t test_max_sub_iters = 1024;
+
+// Maximum size of chunk divided by MEM_ALIGNMENT
+const uint32_t test_max_chunk_size_divided_by_alignment = 32;
+
+int
+main( int __unused argc,
+      char __unused **argv)
+{
+    srand((unsigned int) time(NULL));
+    int k = rand();
+    printf("seed=%d\n", k);
+    srand((unsigned int) k);
+
+    for ( int i = 0; i < test_iters; i++ )
+    {
+	mem_PoolState_t pool;
+	uint8_t test_pool[test_pool_area_size] __attribute__((aligned(MEM_ALIGNMENT)));
+
+	const size_t chunkSize = MEM_ALIGNMENT * ( ( rand() % test_max_chunk_size_divided_by_alignment ) + 1 );
+
+	mem_PoolInit( &pool, chunkSize, test_pool, sizeof (test_pool));
+
+        const size_t subiters = ( (size_t) rand() % test_max_sub_iters ) + 1;
+        uint8_t* ptrs[subiters];
+
+        for ( size_t j = 0; j < subiters; j++ )
+        {
+            ptrs[j] = mem_PoolAllocChunk( &pool);
+
+	    // TODO: Enable check with condition that j <= minimum count of chunks that fit in the pool
+            // JERRY_ASSERT(ptrs[j] != NULL);
+
+            if ( ptrs[j] != NULL )
+            {
+                memset(ptrs[j], 0, chunkSize);
+            }
+        }
+
+        // mem_HeapPrint( true);
+
+        for ( size_t j = 0; j < subiters; j++ )
+        {
+            if ( ptrs[j] != NULL )
+            {
+                for ( size_t k = 0; k < chunkSize; k++ )
+                {
+                    JERRY_ASSERT( ((uint8_t*)ptrs[j])[k] == 0 );
+                }
+
+                mem_PoolFreeChunk( &pool, ptrs[j]);
+            }
+        }
+    }
+
+    return 0;
+} /* main */
diff --git a/tests/unit/test_poolman.c b/tests/unit/test_poolman.c
new file mode 100644
index 000000000..a76b13e2f
--- /dev/null
+++ b/tests/unit/test_poolman.c
@@ -0,0 +1,97 @@
+/* Copyright 2014 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Unit test for pool manager.
+ */
+
+#define JERRY_MEM_POOL_INTERNAL
+
+#include "globals.h"
+#include "jerry-libc.h"
+#include "mem-allocator.h"
+#include "mem-pool.h"
+#include "mem-poolman.h"
+
+extern void srand (unsigned int __seed);
+extern int rand (void);
+extern long int time (long int *__timer);
+
+// Heap size is 8K
+const size_t test_heap_size = 8 * 1024;
+
+// Iterations count
+const uint32_t test_iters = 16384;
+
+// Subiterations count
+const uint32_t test_max_sub_iters = 64;
+
+int
+main( int __unused argc,
+      char __unused **argv)
+{
+    uint8_t heap[test_heap_size] __attribute__((aligned(MEM_ALIGNMENT)));
+
+    mem_HeapInit( heap, sizeof (heap));
+    mem_PoolsInit();
+
+    srand((unsigned int) time(NULL));
+    unsigned int seed = (unsigned int)rand();
+    libc_printf("seed=%u\n", seed);
+    srand(seed);
+
+    for ( int i = 0; i < test_iters; i++ )
+    {
+        const size_t subiters = ( (size_t) rand() % test_max_sub_iters ) + 1;
+
+        uint8_t * ptrs[subiters];
+        mem_PoolChunkType_t types[subiters];
+
+        for ( size_t j = 0; j < subiters; j++ )
+        {
+            mem_PoolChunkType_t type = (mem_PoolChunkType_t) (rand() % MEM_POOL_CHUNK_TYPE__COUNT);
+            const uint32_t chunkSize = mem_GetChunkSize( type);
+
+            types[j] = type;
+            ptrs[j] = mem_PoolsAlloc( type);
+            JERRY_ASSERT(ptrs[j] != NULL);
+
+            if ( ptrs[j] != NULL )
+            {
+                libc_memset(ptrs[j], 0, chunkSize);
+            }
+        }
+
+        // mem_HeapPrint( false);
+        
+        for ( size_t j = 0; j < subiters; j++ )
+        {
+            if ( ptrs[j] != NULL )
+            {
+                mem_PoolChunkType_t type = types[j];
+		const uint32_t chunkSize = mem_GetChunkSize( type);
+
+                for ( size_t k = 0; k < chunkSize; k++ )
+                {
+                    JERRY_ASSERT( ((uint8_t*) ptrs[j])[k] == 0 );
+                }
+                
+                mem_PoolsFree( type, ptrs[j]);
+            }
+        }
+    }
+
+    return 0;
+} /* main */
diff --git a/tools/jerry_unittest.sh b/tools/jerry_unittest.sh
new file mode 100755
index 000000000..645aef2ce
--- /dev/null
+++ b/tools/jerry_unittest.sh
@@ -0,0 +1,33 @@
+# Copyright 2014 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#!/bin/bash
+
+DIR="$1"
+UNITTESTS="${*:2}"
+
+for unit_test in $UNITTESTS;
+do
+  echo -n "Running $unit_test... ";
+
+  $DIR/$unit_test 2>&1 >> $DIR/unit_tests_run.log;
+  if [ $? -eq 0 ];
+  then
+    echo OK;
+  else
+    echo FAILED;
+    exit 1;
+  fi;
+done
+