diff --git a/src/test/vector.cpp b/src/test/vector.cpp
index 7a13558a2..0bc2aeb36 100644
--- a/src/test/vector.cpp
+++ b/src/test/vector.cpp
@@ -17,8 +17,92 @@ Revision History:
 
 --*/
 #include "util/vector.h"
+#include "util/rational.h"
 #include <iostream>
 
+static void tst_resize_rational() {
+    // grow from empty using default initialization (zero)
+    vector<rational> v;
+    v.resize(4);
+    ENSURE(v.size() == 4);
+    for (unsigned i = 0; i < 4; ++i)
+        ENSURE(v[i].is_zero());
+
+    // shrink: elements below new size are preserved
+    v.resize(2);
+    ENSURE(v.size() == 2);
+    for (unsigned i = 0; i < 2; ++i)
+        ENSURE(v[i].is_zero());
+
+    // grow with explicit value initialization
+    rational half(1, 2);
+    v.resize(6, half);
+    ENSURE(v.size() == 6);
+    for (unsigned i = 0; i < 2; ++i)
+        ENSURE(v[i].is_zero());
+    for (unsigned i = 2; i < 6; ++i)
+        ENSURE(v[i] == half);
+
+    // resize to same size is a no-op
+    rational three(3);
+    v.resize(6, three);
+    ENSURE(v.size() == 6);
+    for (unsigned i = 2; i < 6; ++i)
+        ENSURE(v[i] == half);
+
+    // resize to zero clears the vector
+    v.resize(0);
+    ENSURE(v.empty());
+
+    // grow again after being empty
+    rational neg(-7);
+    v.resize(3, neg);
+    ENSURE(v.size() == 3);
+    for (unsigned i = 0; i < 3; ++i)
+        ENSURE(v[i] == neg);
+}
+
+static void tst_resize() {
+    // grow from empty using default initialization
+    svector<int> v;
+    v.resize(5);
+    ENSURE(v.size() == 5);
+    ENSURE(v.capacity() >= 5);
+    for (unsigned i = 0; i < 5; ++i)
+        ENSURE(v[i] == 0);
+
+    // shrink: elements below new size are preserved, size shrinks
+    v.resize(3);
+    ENSURE(v.size() == 3);
+    for (unsigned i = 0; i < 3; ++i)
+        ENSURE(v[i] == 0);
+
+    // grow with explicit value initialization
+    v.resize(7, 42);
+    ENSURE(v.size() == 7);
+    for (unsigned i = 0; i < 3; ++i)
+        ENSURE(v[i] == 0);
+    for (unsigned i = 3; i < 7; ++i)
+        ENSURE(v[i] == 42);
+
+    // resize to same size is a no-op
+    v.resize(7, 99);
+    ENSURE(v.size() == 7);
+    for (unsigned i = 3; i < 7; ++i)
+        ENSURE(v[i] == 42);
+
+    // resize to zero clears the vector
+    v.resize(0);
+    ENSURE(v.empty());
+    ENSURE(v.size() == 0);
+
+    // grow again after being empty
+    v.resize(4, 10);
+    ENSURE(v.size() == 4);
+    for (unsigned i = 0; i < 4; ++i)
+        ENSURE(v[i] == 10);
+}
+
 static void tst1() {
     svector<int> v1;
     ENSURE(v1.empty());
@@ -58,5 +142,7 @@ static void tst1() {
 }
 
 void tst_vector() {
+    tst_resize_rational();
+    tst_resize();
     tst1();
 }