1 files changed, 27 insertions, 0 deletions
diff --git a/test/unit/test_c_api.cpp b/test/unit/test_c_api.cpp
index 486ab0c7..12e98d7e 100644
--- a/test/unit/test_c_api.cpp
+++ b/test/unit/test_c_api.cpp
@@ -3220,4 +3220,31 @@ TEST_F(CApi, proj_get_crs_info_list_from_database) {
         proj_crs_info_list_destroy(list);
     }
 }
+
+// ---------------------------------------------------------------------------
+
+TEST_F(CApi, proj_normalize_for_visualization) {
+
+    {
+        auto P = proj_create(m_ctxt, "+proj=utm +zone=31 +ellps=WGS84");
+        ObjectKeeper keeper_P(P);
+        ASSERT_NE(P, nullptr);
+        auto Pnormalized = proj_normalize_for_visualization(m_ctxt, P);
+        ObjectKeeper keeper_Pnormalized(Pnormalized);
+        EXPECT_EQ(Pnormalized, nullptr);
+    }
+
+    auto P = proj_create_crs_to_crs(m_ctxt, "EPSG:4326", "EPSG:32631", nullptr);
+    ObjectKeeper keeper_P(P);
+    ASSERT_NE(P, nullptr);
+    auto Pnormalized = proj_normalize_for_visualization(m_ctxt, P);
+    ObjectKeeper keeper_Pnormalized(Pnormalized);
+    ASSERT_NE(Pnormalized, nullptr);
+    auto projstr = proj_as_proj_string(m_ctxt, Pnormalized, PJ_PROJ_5, nullptr);
+    ASSERT_NE(projstr, nullptr);
+    EXPECT_EQ(std::string(projstr),
+              "+proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad "
+              "+step +proj=utm +zone=31 +ellps=WGS84");
+}
+
 } // namespace