diff --git a/unittest.cpp b/unittest.cpp
index 6a316f1..3fd0ebd 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -2,6 +2,9 @@
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest.h"
 #include "histogram_internal.h"
+#include "svg.h"
+#include <vector>
+#include "histogram.h"
 
 TEST_CASE("distinct positive numbers") {
     double min = 0;
@@ -10,12 +13,45 @@ TEST_CASE("distinct positive numbers") {
     CHECK(min == 1);
     CHECK(max == 2);
 }
-TEST_CASE("empty vector"){
-    double min = 0;
-    double max = 0;
-    std::vector<double> numbers;
-    find_minmax(numbers, min, max);
-    CHECK(min == 0);
-    CHECK(max == 0);
+TEST_CASE("show histogram vertical") {
+    SUBCASE("single bin") {
+        std::vector<std::size_t> bins = {5};
+        CHECK_NOTHROW(show_histogram_svg_vertical(bins));
+    }
+
+    SUBCASE("multiple bins") {
+        std::vector<std::size_t> bins = {3, 7, 2, 9, 5};
+        CHECK_NOTHROW(show_histogram_svg_vertical(bins));
+    }
+
+    SUBCASE("maxbin <= 76") {
+        std::vector<std::size_t> bins = {50, 30, 20, 10, 5};
+        CHECK_NOTHROW(show_histogram_svg_vertical(bins));
+    }
+
+    SUBCASE("maxbin > 76") {
+        std::vector<std::size_t> bins = {100, 200, 300, 400, 500};
+        CHECK_NOTHROW(show_histogram_svg_vertical(bins));
+    }
+}
+
+TEST_CASE("make histogram") {
+    SUBCASE("single bin") {
+        std::vector<double> numbers = {1, 2, 3, 4, 5};
+        std::vector<std::size_t> res = {5};
+        CHECK(make_histogram(numbers, 1) == res);
+    }
+
+    SUBCASE("multiple bins") {
+        std::vector<double> numbers = {1, 2, 3, 4, 5};
+        std::vector<std::size_t> res = {2, 1, 2};
+        CHECK(make_histogram(numbers, 3) == res);
+    }
+
+    SUBCASE("min and max are the same") {
+        std::vector<double> numbers = {1, 1, 1, 1, 1};
+        std::vector<std::size_t> res = {5};
+        CHECK(make_histogram(numbers, 1) == res);
+    }
 }