AP_OLC: add unit tests

libraries/AP_OLC/tests/test_olc.cpp

@@ -0,0 +1,52 @@
+#include <AP_gtest.h>
+#include "AP_Math/AP_Math.h"
+#include "AP_OLC/AP_OLC.h"
+
+AP_OLC olc;
+const AP_HAL::HAL& hal = AP_HAL::get_HAL();
+
+// Test the olc_encode function of AP_OLC
+TEST(AP_OLCTest, OLC_EncodeTest) {
+    // Test cases
+    struct TestCase {
+        int32_t lat;
+        int32_t lon;
+        size_t length;
+        std::string expectedCode;
+    };
+
+    // Define the test cases
+    std::vector<TestCase> testCases = {
+            {500000000, 1000000000, 6, "9P2222"},
+            {900000000, 2000000000, 8, "C3X2X2X2"},
+            {000000000, 500000000, 9, "6HGG2222+"},
+            {300000000, 500000000, 10, "8H2G2222+2"},
+            {300000000, 500000000, 11, "8H2G2222+22"},
+            {300000000, 500000000, 12, "8H2G2222+22"},
+            {300000000, -1000000000, 10, "86222222+2"},
+            {950000000, -1900000000, 12, "CVXGX2X2+X2"},
+            // Add more test cases as needed
+    };
+    // Run the test cases
+    for (const auto& testCase : testCases) {
+        std::string buf(testCase.length + 2, '\0');  // buf should be > length +1 as the coding add \0
+        uint32_t result = olc.olc_encode(testCase.lat, testCase.lon, testCase.length, &buf[0], buf.size());
+        if (testCase.length < 9) {
+            EXPECT_EQ(result, 9u);  // 9 is separator min position
+        } else {
+            EXPECT_EQ(result, 11u);  // length max is 11
+        }
+        EXPECT_EQ(buf.substr(0, MIN(testCase.length, 11u)), testCase.expectedCode);
+    }
+    std::string buf(2, '\0');
+    uint32_t result = olc.olc_encode(testCases[0].lat, testCases[0].lon, testCases[0].length, &buf[0], buf.size());
+    EXPECT_EQ(result, 0u);
+    std::string empty_code(2, '\0');
+    EXPECT_EQ(buf, empty_code);
+    std::string buf2(16, '\0');  // buf should be > length +1 as the coding add \0
+    result = olc.olc_encode(testCases[0].lat, testCases[0].lon, 11, &buf2[0], buf2.size());
+    EXPECT_EQ(result, 12u);
+    EXPECT_EQ(buf2.substr(0, 12), "9P222222+222");
+}
+
+AP_GTEST_MAIN()

libraries/AP_OLC/tests/wscript

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+def build(bld):
+    bld.ap_find_tests(
+        use='ap',
+    )