Merge pull request #7943 from baude/issue7807

prevent unpredictable results with network create|remove

1 files changed, 35 insertions, 0 deletions

diff --git a/libpod/network/network_test.go b/libpod/network/network_test.go
new file mode 100644
index 000000000..1969e792c
--- /dev/null
+++ b/libpod/network/network_test.go
@@ -0,0 +1,35 @@
+package network
+
+import (
+	"net"
+	"testing"
+)
+
+func parseCIDR(n string) *net.IPNet {
+	_, parsedNet, _ := net.ParseCIDR(n)
+	return parsedNet
+}
+
+func Test_networkIntersect(t *testing.T) {
+	type args struct {
+		n1 *net.IPNet
+		n2 *net.IPNet
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{"16 and 24 intersects", args{n1: parseCIDR("192.168.0.0/16"), n2: parseCIDR("192.168.1.0/24")}, true},
+		{"24 and 25 intersects", args{n1: parseCIDR("192.168.1.0/24"), n2: parseCIDR("192.168.1.0/25")}, true},
+		{"Two 24s", args{n1: parseCIDR("192.168.1.0/24"), n2: parseCIDR("192.168.2.0/24")}, false},
+	}
+	for _, tt := range tests {
+		test := tt
+		t.Run(tt.name, func(t *testing.T) {
+			if got := networkIntersect(test.args.n1, test.args.n2); got != test.want {
+				t.Errorf("networkIntersect() = %v, want %v", got, test.want)
+			}
+		})
+	}
+}