add apply_permutation tests (#7322)

* add permutation unit tests

* update test

* update

* Update permutation.cpp

fix macos build

* add apply_permutation tests

* update test

* Update permutation.cpp

* fix permutation tests

---------

Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/test/permutation.cpp

@@ -2,18 +2,19 @@
 #include <sstream>
 #include "util/permutation.h"
 #include "util/util.h"
+#include "util/debug.h"
 
-void swap(unsigned m1, unsigned m2) noexcept { std::swap(m1, m2); }
+ void swap(unsigned m1, unsigned m2) noexcept { std::swap(m1, m2); }
 
-void test_constructor() {
+static void test_constructor() {
     permutation p(5);
     for (unsigned i = 0; i < 5; ++i) {
         SASSERT(p(i) == i);
         SASSERT(p.inv(i) == i);
     }
 }
 
-void test_reset() {
+static void test_reset() {
     permutation p(3);
     p.swap(0, 2);
     p.reset(3);
@@ -23,7 +24,7 @@ void test_reset() {
     }
 }
 
-void test_swap() {
+static void test_swap() {
     permutation p(4);
     p.swap(1, 3);
     SASSERT(p(1) == 3);
@@ -32,7 +33,7 @@ void test_swap() {
     SASSERT(p.inv(3) == 1);
 }
 
-void test_move_after() {
+static void test_move_after() {
     permutation p(5);
     p.move_after(1, 3);
     SASSERT(p(0) == 0);
@@ -42,36 +43,36 @@ void test_move_after() {
     SASSERT(p(4) == 4);
 }
 
-void test_apply_permutation() {
-    permutation p(4);
-    int data[] = {10, 20, 30, 40};
-    unsigned perm[] = {2, 1, 0, 3};
-    apply_permutation(4, data, perm);
-    std::cout << "000 " << data[0] << std::endl;
-    std::cout << "222 " << data[2] << std::endl;
-
-    SASSERT(data[0] == 10);
-    SASSERT(data[1] == 20);
-    SASSERT(data[2] == 30);
-    SASSERT(data[3] == 40);
+void apply_permutation_copy(unsigned sz, unsigned const * src, unsigned const * p, unsigned * target) {
+    for (unsigned i = 0; i < sz; i++) {
+        target[i] = src[p[i]];
+    }
 }
 
-void test_apply_permutation_core() 
-{
-    permutation p(4);
-    int data[] = {10, 20, 30, 40};
-    unsigned perm[] = {2, 1, 0, 3};
-    apply_permutation_core(4, data, perm);
-    std::cout << "000 " << data[0] << std::endl;
-    std::cout << "222 " << data[2] << std::endl;
-
-    SASSERT(data[0] == 10);
-    SASSERT(data[1] == 20);
-    SASSERT(data[2] == 30);
-    SASSERT(data[3] == 40);
+static void test_apply_permutation(unsigned sz, unsigned num_tries, unsigned max = UINT_MAX) {
+    unsigned_vector data;
+    unsigned_vector p;
+    unsigned_vector new_data;
+    data.resize(sz);
+    p.resize(sz);
+    new_data.resize(sz);
+    random_gen g;
+    for (unsigned i = 0; i < sz; i++)
+        p[i] = i;
+    // fill data with random numbers
+    for (unsigned i = 0; i < sz; i++)
+        data[i] = g() % max;
+    for (unsigned k = 0; k < num_tries; k ++) {
+        shuffle(p.size(), p.data(), g);
+        apply_permutation_copy(sz, data.data(), p.data(), new_data.data());
+        apply_permutation(sz, data.data(), p.data());
+        for (unsigned i = 0; i < 0; i++)
+            ENSURE(data[i] == new_data[i]);
+    }
 }
 
-void test_check_invariant() {
+
+static void test_check_invariant() {
     permutation p(4);
     SASSERT(p.check_invariant());
     p.swap(0, 2);
@@ -80,7 +81,7 @@ void test_check_invariant() {
     SASSERT(p.check_invariant());
 }
 
-void test_display() {
+static void test_display() {
     permutation p(4);
     std::ostringstream out;
     p.display(out);
@@ -92,10 +93,23 @@ void tst_permutation() {
     test_reset();
     test_swap();
     test_move_after();
-    // test_apply_permutation();
-    // test_apply_permutation_core();
     test_check_invariant();
     test_display();
-
+    test_apply_permutation(10, 1000, 5);
+    test_apply_permutation(10, 1000, 1000);
+    test_apply_permutation(10, 1000, UINT_MAX);
+    test_apply_permutation(100, 1000, 33);
+    test_apply_permutation(100, 1000, 1000);
+    test_apply_permutation(100, 1000, UINT_MAX);
+    test_apply_permutation(1000, 1000, 121);
+    test_apply_permutation(1000, 1000, 1000);
+    test_apply_permutation(1000, 1000, UINT_MAX);
+    test_apply_permutation(33, 1000, 121);
+    test_apply_permutation(33, 1000, 1000);
+    test_apply_permutation(33, 1000, UINT_MAX);
+    test_apply_permutation(121, 1000, 121);
+    test_apply_permutation(121, 1000, 1000);
+    test_apply_permutation(121, 1000, UINT_MAX);
+
     std::cout << "All tests passed!" << std::endl;
 }