Add test to ensure correct operation of DataGridWidget

tests/integration/DataGridTest.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <gtest/gtest.h>
+
+#include "DbTest.h"
+#include "ConnectionConfig.h"
+#include "OpenDatabase.h"
+#include "crud/CrudModel.h"
+#include "crud/DataGridWidget.h"
+#include "Pgsql_Connection.h"
+
+#include <QSortFilterProxyModel>
+#include <QUrl>
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+class DataGridTest : public pgtest::DbTest {
+protected:
+	std::shared_ptr<OpenDatabase> openDb()
+	{
+		QUrl url(dbUrl());
+		ConnectionConfig cfg;
+		cfg.setHost(url.host());
+		cfg.setPort(static_cast<unsigned short>(url.port(5432)));
+		cfg.setUser(url.userName());
+		cfg.setPassword(url.password());
+		cfg.setDbname(url.path().mid(1));
+		return OpenDatabase::createOpenDatabase(cfg);
+	}
+
+	/// Runs the query and shows its result in a grid
+	void showQuery(const char *sql)
+	{
+		db = openDb();
+		auto result = std::make_shared<Pgsql::Result>(conn().query(sql));
+		model = std::make_unique<CrudModel>();
+		widget = std::make_unique<DataGridWidget>();
+		widget->setSourceModel(model.get());
+		model->setResult(db, result);
+	}
+
+	/// Editable flag of every result column, as seen through the widget's proxy
+	std::vector<bool> editableColumns()
+	{
+		auto proxy = widget->proxy();
+		std::vector<bool> r;
+		for (int c = 1; c < proxy->columnCount(); ++c)
+			r.push_back(proxy->flags(proxy->index(0, c)) & Qt::ItemIsEditable);
+		return r;
+	}
+
+	QString columnName(int resultCol)
+	{
+		return widget->proxy()->headerData(resultCol + 1, Qt::Horizontal).toString().section('\n', 0, 0);
+	}
+
+	/// Reads a single cell with the test's own connection
+	std::optional<std::string> dbValue(const char *sql)
+	{
+		auto res = conn().query(sql);
+		auto v = res.get(0, 0);
+		if (v.null())
+			return std::nullopt;
+		return std::string(v.c_str());
+	}
+
+	std::shared_ptr<OpenDatabase> db;
+	std::unique_ptr<CrudModel> model;
+	std::unique_ptr<DataGridWidget> widget;
+};