Add draft unit tests for crashers

Author: vibridi

autolayout_test.go

@@ -0,0 +1,36 @@
+package autog
+
+import (
+	"testing"
+
+	"github.com/nulab/autog/graph"
+	"github.com/nulab/autog/phase4"
+	"github.com/stretchr/testify/assert"
+)
+
+// These tests are meant to ensure a minimal degree of reliability of the default layout pipeline and
+// a first barrier against regressions, pending proper unit tests
+func TestLayoutCrashers(t *testing.T) {
+	t.Run("phase4 SinkColoring", func(t *testing.T) {
+		t.Run("#1 and #4", func(t *testing.T) {
+			g := graph.FromEdgeSlice([][]string{
+				{"N1", "N2"},
+				{"N3", "N1"},
+				{"N2", "N3"},
+				{"Nh", "N1"},
+				{"Nk", "N1"},
+				{"Na", "N2"},
+				{"Na", "N3"},
+				{"N2", "Nd"},
+			})
+			assert.NotPanics(t, func() {
+				g = Layout(g, WithPositioning(phase4.SinkColoring))
+			})
+			assertInvariants(t, g)
+		})
+	})
+}
+
+func assertInvariants(t *testing.T, g *graph.DGraph) {
+	// todo
+}