diff --git a/project/emptiness_width.h b/project/emptiness_width.h
new file mode 100644
index 0000000..7d4f8e8
--- /dev/null
+++ b/project/emptiness_width.h
@@ -0,0 +1,10 @@
+#ifndef TEXT_H_INCLUDED
+#define TEXT_H_INCLUDED
+
+size_t emptiness_width (size_t a, size_t b)
+{
+    size_t c = a - b;
+    return c;
+}
+
+#endif // TEXT_H_INCLUDED
diff --git a/project/pr3.cbp b/project/pr3.cbp
index 4542632..427188d 100644
--- a/project/pr3.cbp
+++ b/project/pr3.cbp
@@ -33,6 +33,7 @@
 			<Add option="-fexceptions" />
 		</Compiler>
 		<Unit filename=".gitignore" />
+		<Unit filename="emptiness_width.h" />
 		<Unit filename="histogram.cpp" />
 		<Unit filename="histogram.h" />
 		<Unit filename="histogram_internal.h" />
diff --git a/unittest.cpp b/unittest.cpp
index 69ba8f3..3cdd704 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -4,6 +4,7 @@
 #include "doctest.h"
 #include "project/histogram_internal.h"
 #include "project/svg.h"
+#include "project/emptiness_width.h"
 
 /* TEST_CASE("distinct positive numbers 1")
 {
@@ -44,13 +45,22 @@ TEST_CASE("vector with same elements") {
 
 */
 
-TEST_CASE("distinct positive numbers 1")
+TEST_CASE("test1 var 5")
 {
-    double min = 0;
-    double max = 0;
-    find_minmax({1, 2}, min, max);
-    CHECK(min == 1);
-    CHECK(max == 2);
+    size_t a = 100;
+    size_t b = 200;
+    size_t c = emptiness_width (b,a);
+    CHECK(c == b-a);
 }
 
+TEST_CASE("test2 var 5")
+{
+    size_t a = 100;
+    size_t b = 200;
+    size_t c = emptiness_width (a,b);
+    CHECK(c != b-a);
+}
+
+
+