C API: add proj_concatoperation_get_step_count() and proj_concatoperation_get_step()

1 files changed, 69 insertions, 0 deletions

diff --git a/test/unit/test_c_api.cpp b/test/unit/test_c_api.cpp
index 99904fd4..82974e13 100644
--- a/test/unit/test_c_api.cpp
+++ b/test/unit/test_c_api.cpp
@@ -3420,4 +3420,73 @@ TEST_F(CApi, proj_get_scope) {
     }
 }
 
+// ---------------------------------------------------------------------------
+
+TEST_F(CApi, proj_concatoperation_get_step) {
+    // Test on a non concatenated operation
+    {
+        auto co = proj_create_from_database(m_ctxt, "EPSG", "8048",
+                                            PJ_CATEGORY_COORDINATE_OPERATION,
+                                            false, nullptr);
+        ObjectKeeper keeper(co);
+        ASSERT_NE(co, nullptr);
+        ASSERT_NE(proj_get_type(co), PJ_TYPE_CONCATENATED_OPERATION);
+
+        ASSERT_EQ(proj_concatoperation_get_step_count(m_ctxt, co), 0);
+        ASSERT_EQ(proj_concatoperation_get_step(m_ctxt, co, 0), nullptr);
+    }
+    // Test on a concatenated operation
+    {
+        auto ctxt = proj_create_operation_factory_context(m_ctxt, nullptr);
+        ASSERT_NE(ctxt, nullptr);
+        ContextKeeper keeper_ctxt(ctxt);
+
+        // GDA94 / MGA zone 56
+        auto source_crs = proj_create_from_database(
+            m_ctxt, "EPSG", "28356", PJ_CATEGORY_CRS, false, nullptr);
+        ASSERT_NE(source_crs, nullptr);
+        ObjectKeeper keeper_source_crs(source_crs);
+
+        // GDA2020 / MGA zone 56
+        auto target_crs = proj_create_from_database(
+            m_ctxt, "EPSG", "7856", PJ_CATEGORY_CRS, false, nullptr);
+        ASSERT_NE(target_crs, nullptr);
+        ObjectKeeper keeper_target_crs(target_crs);
+
+        proj_operation_factory_context_set_spatial_criterion(
+            m_ctxt, ctxt, PROJ_SPATIAL_CRITERION_PARTIAL_INTERSECTION);
+
+        proj_operation_factory_context_set_grid_availability_use(
+            m_ctxt, ctxt, PROJ_GRID_AVAILABILITY_IGNORED);
+
+        auto res = proj_create_operations(m_ctxt, source_crs, target_crs, ctxt);
+        ASSERT_NE(res, nullptr);
+        ObjListKeeper keeper_res(res);
+
+        ASSERT_GT(proj_list_get_count(res), 0);
+
+        auto op = proj_list_get(m_ctxt, res, 0);
+        ASSERT_NE(op, nullptr);
+        ObjectKeeper keeper_op(op);
+
+        ASSERT_EQ(proj_get_type(op), PJ_TYPE_CONCATENATED_OPERATION);
+        ASSERT_EQ(proj_concatoperation_get_step_count(m_ctxt, op), 3);
+
+        EXPECT_EQ(proj_concatoperation_get_step(m_ctxt, op, -1), nullptr);
+        EXPECT_EQ(proj_concatoperation_get_step(m_ctxt, op, 3), nullptr);
+
+        auto step = proj_concatoperation_get_step(m_ctxt, op, 1);
+        ASSERT_NE(step, nullptr);
+        ObjectKeeper keeper_step(step);
+
+        const char* scope = proj_get_scope(step);
+        EXPECT_NE(scope, nullptr);
+        EXPECT_NE(std::string(scope), std::string());
+
+        const char* remarks = proj_get_remarks(step);
+        EXPECT_NE(remarks, nullptr);
+        EXPECT_NE(std::string(remarks), std::string());
+    }
+}
+
 } // namespace