diff --git a/modules/imgproc/test/test_convhull.cpp b/modules/imgproc/test/test_convhull.cpp
index 654df9167d..90889db044 100644
--- a/modules/imgproc/test/test_convhull.cpp
+++ b/modules/imgproc/test/test_convhull.cpp
@@ -52,10 +52,6 @@ namespace opencv_test { namespace {
 
 TEST(minEnclosingCircle, basic_test)
 {
-    vector<Point2f> pts;
-    pts.push_back(Point2f(0, 0));
-    pts.push_back(Point2f(10, 0));
-    pts.push_back(Point2f(5, 1));
     const float EPS = 1.0e-3f;
     Point2f center;
     float radius;
@@ -64,19 +60,24 @@ TEST(minEnclosingCircle, basic_test)
     //        2
     // 0             1
     // NB: The triangle is obtuse, so the only pts[0] and pts[1] are on the circle.
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 5, EPS);
-    EXPECT_NEAR(center.y, 0, EPS);
-    EXPECT_NEAR(5, radius, EPS);
+    {
+        const vector<Point2f> pts = { {0, 0}, {10, 0}, {5, 1} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 5, EPS);
+        EXPECT_NEAR(center.y, 0, EPS);
+        EXPECT_NEAR(5, radius, EPS);
+    }
 
     // pts[2] is on the circle with diameter pts[0] - pts[1].
     //  2
     // 0 1
-    pts[2] = Point2f(5, 5);
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 5, EPS);
-    EXPECT_NEAR(center.y, 0, EPS);
-    EXPECT_NEAR(5, radius, EPS);
+    {
+        const vector<Point2f> pts = { {0, 0}, {10, 0}, {5, 5} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 5, EPS);
+        EXPECT_NEAR(center.y, 0, EPS);
+        EXPECT_NEAR(5, radius, EPS);
+    }
 
     // pts[2] is outside the circle with diameter pts[0] - pts[1].
     //   2
@@ -84,32 +85,40 @@ TEST(minEnclosingCircle, basic_test)
     //
     // 0   1
     // NB: The triangle is acute, so all 3 points are on the circle.
-    pts[2] = Point2f(5, 10);
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 5, EPS);
-    EXPECT_NEAR(center.y, 3.75, EPS);
-    EXPECT_NEAR(6.25f, radius, EPS);
+    {
+        const vector<Point2f> pts = { {0, 0}, {10, 0}, {5, 10} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 5, EPS);
+        EXPECT_NEAR(center.y, 3.75, EPS);
+        EXPECT_NEAR(6.25f, radius, EPS);
+    }
 
     // The 3 points are colinear.
-    pts[2] = Point2f(3, 0);
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 5, EPS);
-    EXPECT_NEAR(center.y, 0, EPS);
-    EXPECT_NEAR(5, radius, EPS);
+    {
+        const vector<Point2f> pts = { {0, 0}, {10, 0}, {3, 0} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 5, EPS);
+        EXPECT_NEAR(center.y, 0, EPS);
+        EXPECT_NEAR(5, radius, EPS);
+    }
 
     // 2 points are the same.
-    pts[2] = pts[1];
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 5, EPS);
-    EXPECT_NEAR(center.y, 0, EPS);
-    EXPECT_NEAR(5, radius, EPS);
+    {
+        const vector<Point2f> pts = { {0, 0}, {10, 0}, {10, 0} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 5, EPS);
+        EXPECT_NEAR(center.y, 0, EPS);
+        EXPECT_NEAR(5, radius, EPS);
+    }
 
     // 3 points are the same.
-    pts[0] = pts[1];
-    minEnclosingCircle(pts, center, radius);
-    EXPECT_NEAR(center.x, 10, EPS);
-    EXPECT_NEAR(center.y, 0, EPS);
-    EXPECT_NEAR(0, radius, EPS);
+    {
+        const vector<Point2f> pts = { {10, 0}, {10, 0}, {10, 0} };
+        minEnclosingCircle(pts, center, radius);
+        EXPECT_NEAR(center.x, 10, EPS);
+        EXPECT_NEAR(center.y, 0, EPS);
+        EXPECT_NEAR(0, radius, EPS);
+    }
 }
 
 TEST(Imgproc_minEnclosingCircle, regression_16051) {