diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index f8ee09c05..efcb06041 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -175,6 +175,39 @@ mbedtls_mpi_cmp_mpi:10:"2":10:"-3":1
 Base test mbedtls_mpi_cmp_mpi (Mixed values) #6
 mbedtls_mpi_cmp_mpi:10:"-2":10:"31231231289798":-1
 
+Base test mbedtls_mpi_cmp_mpi_ct #1
+mbedtls_mpi_cmp_mpi_ct:1:10:"693":1:10:"693":0:0
+
+Base test mbedtls_mpi_cmp_mpi_ct #2
+mbedtls_mpi_cmp_mpi_ct:1:10:"693":1:10:"692":1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct #3
+mbedtls_mpi_cmp_mpi_ct:1:10:"693":1:10:"694":-1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Negative values) #1
+mbedtls_mpi_cmp_mpi_ct:1:10:"-2":1:10:"-2":0:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Negative values) #2
+mbedtls_mpi_cmp_mpi_ct:1:10:"-2":1:10:"-3":1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Negative values) #3
+mbedtls_mpi_cmp_mpi_ct:1:10:"-2":1:10:"-1":-1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Mixed values) #4
+mbedtls_mpi_cmp_mpi_ct:1:10:"-3":1:10:"2":-1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Mixed values) #5
+mbedtls_mpi_cmp_mpi_ct:1:10:"2":1:10:"-3":1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (Mixed values) #6
+mbedtls_mpi_cmp_mpi_ct:2:10:"-2":2:10:"31231231289798":-1:0
+
+Base test mbedtls_mpi_cmp_mpi_ct (X is longer in storage) #7
+mbedtls_mpi_cmp_mpi_ct:3:10:"693":2:10:"693":0:MBEDTLS_ERR_MPI_BAD_INPUT_DATA
+
+Base test mbedtls_mpi_cmp_mpi_ct (Y is longer in storage) #8
+mbedtls_mpi_cmp_mpi_ct:3:10:"693":4:10:"693":0:MBEDTLS_ERR_MPI_BAD_INPUT_DATA
+
 Base test mbedtls_mpi_cmp_abs #1
 mbedtls_mpi_cmp_abs:10:"693":10:"693":0
 
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index eaae1968e..97fd7b983 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -587,6 +587,29 @@ exit:
 }
 /* END_CASE */
 
+/* BEGIN_CASE */
+void mbedtls_mpi_cmp_mpi_ct( int size_X, int radix_X, char * input_X, int size_Y,
+                             int radix_Y, char * input_Y, int input_ret, int input_err )
+{
+    int ret;
+    mbedtls_mpi X, Y;
+    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
+
+    TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
+    TEST_ASSERT( mbedtls_mpi_read_string( &Y, radix_Y, input_Y ) == 0 );
+
+    mbedtls_mpi_grow( &X, size_X );
+    mbedtls_mpi_grow( &Y, size_Y );
+
+    TEST_ASSERT( mbedtls_mpi_cmp_mpi_ct( &X, &Y, &ret ) == input_err );
+    if( input_err == 0 )
+        TEST_ASSERT( ret == input_ret );
+
+exit:
+    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
+}
+/* END_CASE */
+
 /* BEGIN_CASE */
 void mbedtls_mpi_cmp_abs( int radix_X, char * input_X, int radix_Y,
                           char * input_Y, int input_A )