[PATCH 1/5] test: ipa: libipa: Add histogram tests

[Stefan Klug]

Add some basic tests for the histogram class.

Signed-off-by: Stefan Klug <stefan.klug at ideasonboard.com>
---
 test/ipa/libipa/histogram.cpp | 53 +++++++++++++++++++++++++++++++++++
 test/ipa/libipa/meson.build   |  1 +
 2 files changed, 54 insertions(+)
 create mode 100644 test/ipa/libipa/histogram.cpp

diff --git a/test/ipa/libipa/histogram.cpp b/test/ipa/libipa/histogram.cpp
new file mode 100644
index 000000000000..220a329e33b3
--- /dev/null
+++ b/test/ipa/libipa/histogram.cpp
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2024, Ideas on Board Oy
+ *
+ * Histogram tests
+ */
+
+#include "../src/ipa/libipa/histogram.h"
+
+#include <cmath>
+#include <iostream>
+#include <map>
+#include <stdint.h>
+
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+using namespace ipa;
+
+#define ASSERT_EQ(a, b)                    \
+	if (!((a) == (b))) {               \
+		printf(#a " != " #b "\n"); \
+		return TestFail;           \
+	}
+
+class HistogramTest : public Test
+{
+protected:
+	int run()
+	{
+		auto hist = Histogram({ { 50, 50 } });
+
+		ASSERT_EQ(hist.bins(), 2);
+		ASSERT_EQ(hist.total(), 100);
+
+		ASSERT_EQ(hist.cumulativeFrequency(1.0), 50);
+		ASSERT_EQ(hist.cumulativeFrequency(1.5), 75);
+		ASSERT_EQ(hist.cumulativeFrequency(2.0), 100);
+
+		ASSERT_EQ(hist.quantile(0.0), 0.0);
+		ASSERT_EQ(hist.quantile(1.0), 2.0);
+		ASSERT_EQ(hist.quantile(0.5), 1.0);
+
+		ASSERT_EQ(hist.interQuantileMean(0.0, 1.0), 1.0);
+		ASSERT_EQ(hist.interQuantileMean(0.0, 0.5), 0.5);
+		ASSERT_EQ(hist.interQuantileMean(0.5, 1.0), 1.5);
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(HistogramTest)
diff --git a/test/ipa/libipa/meson.build b/test/ipa/libipa/meson.build
index eaf4b49a187c..f094c1593f1b 100644
--- a/test/ipa/libipa/meson.build
+++ b/test/ipa/libipa/meson.build
@@ -2,6 +2,7 @@
 
 libipa_test = [
     {'name': 'fixedpoint', 'sources': ['fixedpoint.cpp']},
+    {'name': 'histogram', 'sources': ['histogram.cpp']},
     {'name': 'interpolator', 'sources': ['interpolator.cpp']},
 ]
 
-- 
2.43.0