From e9ef462d4549c881cbed89a1240bbbfec4410bab Mon Sep 17 00:00:00 2001
From: "Ryan M. Richard" <rrichard@ameslab.gov>
Date: Mon, 22 Sep 2025 14:18:05 -0500
Subject: [PATCH] adds pt for collocation matrix

---
 .../integration_grids/collocation_matrix.hpp  | 40 +++++++++++++++++++
 .../integration_grids/integration_grids.hpp   |  1 +
 .../integration_grids/collocation_matrix.cpp  | 25 ++++++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 include/simde/integration_grids/collocation_matrix.hpp
 create mode 100644 tests/cxx/unit_tests/integration_grids/collocation_matrix.cpp

diff --git a/include/simde/integration_grids/collocation_matrix.hpp b/include/simde/integration_grids/collocation_matrix.hpp
new file mode 100644
index 0000000..89fff58
--- /dev/null
+++ b/include/simde/integration_grids/collocation_matrix.hpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2025 NWChemEx-Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <chemist/grid/grid_class.hpp>
+#include <pluginplay/property_type/property_type.hpp>
+#include <simde/types.hpp>
+
+namespace simde {
+
+DECLARE_PROPERTY_TYPE(CollocationMatrix);
+
+PROPERTY_TYPE_INPUTS(CollocationMatrix) {
+    using grid_type     = chemist::Grid;
+    using ao_basis_type = simde::type::ao_basis_set;
+    return pluginplay::declare_input()
+      .add_field<grid_type>("Grid")
+      .add_field<const ao_basis_type&>("AO Basis Set");
+}
+
+PROPERTY_TYPE_RESULTS(CollocationMatrix) {
+    using result_type = simde::type::tensor;
+    return pluginplay::declare_result().add_field<result_type>(
+      "Collocation Matrix");
+}
+
+} // namespace simde
diff --git a/include/simde/integration_grids/integration_grids.hpp b/include/simde/integration_grids/integration_grids.hpp
index 71cf2c4..10ac0f2 100644
--- a/include/simde/integration_grids/integration_grids.hpp
+++ b/include/simde/integration_grids/integration_grids.hpp
@@ -15,4 +15,5 @@
  */
 
 #pragma once
+#include <simde/integration_grids/collocation_matrix.hpp>
 #include <simde/integration_grids/molecular_grid.hpp>
diff --git a/tests/cxx/unit_tests/integration_grids/collocation_matrix.cpp b/tests/cxx/unit_tests/integration_grids/collocation_matrix.cpp
new file mode 100644
index 0000000..3e92ed6
--- /dev/null
+++ b/tests/cxx/unit_tests/integration_grids/collocation_matrix.cpp
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2025 NWChemEx-Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "../test_property_type.hpp"
+#include <simde/integration_grids/collocation_matrix.hpp>
+
+using property_type = simde::CollocationMatrix;
+
+TEST_CASE("CollocationMatrix") {
+    test_property_type<property_type>({"Grid", "AO Basis Set"},
+                                      {"Collocation Matrix"});
+}