added ipv4 validation

ping/ping_test.go

@@ -0,0 +1,25 @@
+package ping
+
+import "testing"
+
+func Test_isValidIPv4(t *testing.T) {
+	type args struct {
+		ip string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{name: "1", args: args{ip: "192.168.1.1"}, want: true},
+		{name: "2", args: args{ip: "192.168.277.1"}, want: false},
+		{name: "3", args: args{ip: "kurac palac"}, want: false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isValidIPv4(tt.args.ip); got != tt.want {
+				t.Errorf("isValidIPv4() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}