diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index 816df77..c0dd018 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -22,6 +22,33 @@
 ECP small addition #8
 ecp_small_add:0:"14":"11":0:"14":"11":0:27:30
 
+ECP small subtraction #1
+ecp_small_sub:1:"":"":1:"":"":1:0:0
+
+ECP small subtraction #2
+ecp_small_sub:1:"":"":0:"14":"11":0:14:36
+
+ECP small subtraction #3
+ecp_small_sub:1:"":"":0:"13":"00":0:13:00
+
+ECP small subtraction #4
+ecp_small_sub:0:"13":"00":0:"13":"00":1:0:0
+
+ECP small subtraction #5
+ecp_small_sub:0:"14":"11":0:"14":"11":1:0:0
+
+ECP small subtraction #6
+ecp_small_sub:0:"13":"00":0:"37":"16":0:34:14
+
+ECP small subtraction #7
+ecp_small_sub:0:"14":"11":0:"37":"16":0:45:07
+
+ECP small subtraction #8
+ecp_small_sub:0:"37":"31":0:"37":"16":0:21:32
+
+ECP small subtraction #9
+ecp_small_sub:0:"14":"11":0:"14":"36":0:27:30
+
 ECP small multiplication negative
 ecp_small_mul:-1:0:0:0:POLARSSL_ERR_ECP_GENERIC
 
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index c82d6e5..f494f4e 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -54,6 +54,43 @@
 END_CASE
 
 BEGIN_CASE
+ecp_small_sub:a_zero:x_a:y_a:b_zero:x_b:y_b:c_zero:x_c:y_c
+{
+    ecp_group grp;
+    ecp_point A, B, C;
+
+    ecp_group_init( &grp );
+    ecp_point_init( &A ); ecp_point_init( &B ); ecp_point_init( &C );
+
+    TEST_ASSERT( ecp_group_read_string( &grp, 10,
+                "47", "4", "17", "42", "13" ) == 0 );
+
+    if( {a_zero} )
+        ecp_set_zero( &A );
+    else
+        TEST_ASSERT( ecp_point_read_string( &A, 10, {x_a}, {y_a} ) == 0 );
+
+    if( {b_zero} )
+        ecp_set_zero( &B );
+    else
+        TEST_ASSERT( ecp_point_read_string( &B, 10, {x_b}, {y_b} ) == 0 );
+
+    TEST_ASSERT( ecp_sub( &grp, &C, &A, &B ) == 0 );
+
+    if( {c_zero} )
+        TEST_ASSERT( mpi_cmp_int( &C.Z, 0 ) == 0 );
+    else
+    {
+        TEST_ASSERT( mpi_cmp_int( &C.X, {x_c} ) == 0 );
+        TEST_ASSERT( mpi_cmp_int( &C.Y, {y_c} ) == 0 );
+    }
+
+    ecp_group_free( &grp );
+    ecp_point_free( &A ); ecp_point_free( &B ); ecp_point_free( &C );
+}
+END_CASE
+
+BEGIN_CASE
 ecp_small_mul:m:r_zero:x_r:y_r:ret
 {
     ecp_group grp;