From e3eaf48b609b1f61b44f3820c0d791f45af6a289 Mon Sep 17 00:00:00 2001
From: Magnus Jacobsson <Magnus.Jacobsson@berotec.se>
Date: Thu, 8 Apr 2021 22:51:26 +0200
Subject: [PATCH] add a few first tests of the rendered SVG

---
 tests/CMakeLists.txt                |   1 +
 tests/test_GVContext_render_svg.cpp | 110 ++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 tests/test_GVContext_render_svg.cpp

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 9ac50e16b..093c199b9 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -63,3 +63,4 @@ create_test(AGraph_construction)
 create_test(GVContext_construction)
 create_test(GVLayout_construction)
 create_test(GVLayout_render)
+create_test(GVContext_render_svg)
diff --git a/tests/test_GVContext_render_svg.cpp b/tests/test_GVContext_render_svg.cpp
new file mode 100644
index 000000000..5d04a3eac
--- /dev/null
+++ b/tests/test_GVContext_render_svg.cpp
@@ -0,0 +1,110 @@
+#include <string_view>
+
+#include <catch2/catch.hpp>
+
+#include "svg_analyzer.h"
+#include <cgraph++/AGraph.h>
+#include <gvc++/GVContext.h>
+#include <gvc++/GVLayout.h>
+#include <gvc++/GVRenderData.h>
+
+TEST_CASE(
+    "Rendering an SVG from a graph without any nodes outputs an SVG containing "
+    "a single (transparent) polygon") {
+  const auto demand_loading = false;
+  auto gvc = GVC::GVContext(lt_preloaded_symbols, demand_loading);
+
+  auto dot = "digraph {}";
+  auto g = CGraph::AGraph(dot);
+
+  const auto layout = GVC::GVLayout(std::move(gvc), std::move(g), "dot");
+
+  const auto result = layout.render("svg");
+  SVGAnalyzer svgAnalyzer{result.c_str()};
+  REQUIRE(svgAnalyzer.num_svgs() == 1);
+  REQUIRE(svgAnalyzer.num_groups() == 1);
+  REQUIRE(svgAnalyzer.num_circles() == 0);
+  REQUIRE(svgAnalyzer.num_ellipses() == 0);
+  REQUIRE(svgAnalyzer.num_lines() == 0);
+  REQUIRE(svgAnalyzer.num_paths() == 0);
+  REQUIRE(svgAnalyzer.num_polygons() == 1);
+  REQUIRE(svgAnalyzer.num_polylines() == 0);
+  REQUIRE(svgAnalyzer.num_rects() == 0);
+  REQUIRE(svgAnalyzer.num_titles() == 0);
+  REQUIRE(svgAnalyzer.num_unknowns() == 0);
+}
+
+TEST_CASE("Rendering an SVG from a graph with a single node outputs an SVG "
+          "containing an ellipse") {
+  const auto demand_loading = false;
+  auto gvc = GVC::GVContext(lt_preloaded_symbols, demand_loading);
+
+  auto dot = "digraph {a}";
+  auto g = CGraph::AGraph(dot);
+
+  const auto layout = GVC::GVLayout(std::move(gvc), std::move(g), "dot");
+
+  const auto result = layout.render("svg");
+  SVGAnalyzer svgAnalyzer{result.c_str()};
+  REQUIRE(svgAnalyzer.num_svgs() == 1);
+  REQUIRE(svgAnalyzer.num_groups() == 2);
+  REQUIRE(svgAnalyzer.num_ellipses() == 1);
+  REQUIRE(svgAnalyzer.num_circles() == 0);
+  REQUIRE(svgAnalyzer.num_lines() == 0);
+  REQUIRE(svgAnalyzer.num_paths() == 0);
+  REQUIRE(svgAnalyzer.num_polygons() == 1);
+  REQUIRE(svgAnalyzer.num_polylines() == 0);
+  REQUIRE(svgAnalyzer.num_rects() == 0);
+  REQUIRE(svgAnalyzer.num_titles() == 1);
+  REQUIRE(svgAnalyzer.num_unknowns() == 0);
+}
+
+TEST_CASE("Rendering an SVG from a graph with two nodes outputs an SVG "
+          "containing two ellipses") {
+  const auto demand_loading = false;
+  auto gvc = GVC::GVContext(lt_preloaded_symbols, demand_loading);
+
+  auto dot = "digraph {a b}";
+  auto g = CGraph::AGraph(dot);
+
+  const auto layout = GVC::GVLayout(std::move(gvc), std::move(g), "dot");
+
+  const auto result = layout.render("svg");
+  SVGAnalyzer svgAnalyzer{result.c_str()};
+  REQUIRE(svgAnalyzer.num_svgs() == 1);
+  REQUIRE(svgAnalyzer.num_groups() == 3);
+  REQUIRE(svgAnalyzer.num_ellipses() == 2);
+  REQUIRE(svgAnalyzer.num_circles() == 0);
+  REQUIRE(svgAnalyzer.num_lines() == 0);
+  REQUIRE(svgAnalyzer.num_paths() == 0);
+  REQUIRE(svgAnalyzer.num_polygons() == 1);
+  REQUIRE(svgAnalyzer.num_polylines() == 0);
+  REQUIRE(svgAnalyzer.num_rects() == 0);
+  REQUIRE(svgAnalyzer.num_titles() == 2);
+  REQUIRE(svgAnalyzer.num_unknowns() == 0);
+}
+
+TEST_CASE("Rendering an SVG from a graph with two nodes and one edge outputs "
+          "an SVG containing two polygons, two ellipses and one path") {
+  const auto demand_loading = false;
+  auto gvc = GVC::GVContext(lt_preloaded_symbols, demand_loading);
+
+  auto dot = "digraph {a -> b}";
+  auto g = CGraph::AGraph(dot);
+
+  const auto layout = GVC::GVLayout(std::move(gvc), std::move(g), "dot");
+
+  const auto result = layout.render("svg");
+  SVGAnalyzer svgAnalyzer{result.c_str()};
+  REQUIRE(svgAnalyzer.num_svgs() == 1);
+  REQUIRE(svgAnalyzer.num_groups() == 4);
+  REQUIRE(svgAnalyzer.num_ellipses() == 2);
+  REQUIRE(svgAnalyzer.num_circles() == 0);
+  REQUIRE(svgAnalyzer.num_lines() == 0);
+  REQUIRE(svgAnalyzer.num_paths() == 1);
+  REQUIRE(svgAnalyzer.num_polygons() == 2);
+  REQUIRE(svgAnalyzer.num_polylines() == 0);
+  REQUIRE(svgAnalyzer.num_rects() == 0);
+  REQUIRE(svgAnalyzer.num_titles() == 3);
+  REQUIRE(svgAnalyzer.num_unknowns() == 0);
+}
-- 
2.49.0