Unittests

histogram.cpp

@@ -1,7 +1,7 @@
 #include "histogram.h"
 #include <vector>
 
-static void find_minmax(const std::vector<double>& numbers, double& min, double& max)
+void find_minmax(const std::vector<double>& numbers, double& min, double& max)
 {
     min = numbers[0];
     for (double x : numbers)

histogram_internal.h

@@ -0,0 +1,4 @@
+#ifndef HISTOGRAM_INTERNAL_H_INCLUDED
+#define HISTOGRAM_INTERNAL_H_INCLUDED
+void find_minmax(const std::vector<double>& numbers, double& min, double& max);
+#endif // HISTOGRAM_INTERNAL_H_INCLUDED

unittest.cbp

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="unittest" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-g" />
+				</Compiler>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/unittest" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="1" />
+				<Option compiler="gcc" />
+				<Compiler>
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+				</Linker>
+			</Target>
+		</Build>
+		<Compiler>
+			<Add option="-Wall" />
+		</Compiler>
+		<Extensions />
+	</Project>
+</CodeBlocks_project_file>

unittest.cpp

@@ -0,0 +1,44 @@
+#define DOCTEST_CONFIG_NO_MULTITHREADING
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "histogram_internal.h"
+
+TEST_CASE("distinct positive numbers") {
+    double min = 0;
+    double max = 0;
+    find_minmax({1, 2}, min, max);
+    CHECK(min == 1);
+    CHECK(max == 2);
+}
+
+TEST_CASE("empty vector") {
+    double min = 0;
+    double max = 0;
+    find_minmax({}, min, max);
+    CHECK(min == 0);
+    CHECK(max == 0);
+}
+
+TEST_CASE("one element") {
+    double min = 0;
+    double max = 0;
+    find_minmax({4}, min, max);
+    CHECK(min == 4);
+    CHECK(max == 4);
+}
+
+TEST_CASE("negative element") {
+    double min = 0;
+    double max = 0;
+    find_minmax({-4, -8}, min, max);
+    CHECK(min == -8);
+    CHECK(max == -4);
+}
+
+TEST_CASE("equal elements") {
+    double min = 0;
+    double max = 0;
+    find_minmax({4, 4}, min, max);
+    CHECK(min == 4);
+    CHECK(max == 4);
+}