diff --git a/testing/gomega/factorial5/factorial.go b/testing/gomega/factorial5/factorial.go
new file mode 100644
index 0000000..34c3ba6
--- /dev/null
+++ b/testing/gomega/factorial5/factorial.go
@@ -0,0 +1,18 @@
+package main
+
+import "errors"
+
+func Factorial(n int64) (int64, error) {
+	switch {
+	case n < 0:
+		return 0, errors.New("math: factorial of negative number?!?")
+	case n == 0:
+		return 1, nil
+	default:
+		ret, err := Factorial(n - 2)
+		if err != nil {
+			return 0, err
+		}
+		return n * ret, nil
+	}
+}
diff --git a/testing/gomega/factorial5/factorial_test.go b/testing/gomega/factorial5/factorial_test.go
new file mode 100644
index 0000000..a708d06
--- /dev/null
+++ b/testing/gomega/factorial5/factorial_test.go
@@ -0,0 +1,36 @@
+package main
+
+import (
+	. "github.com/onsi/gomega"
+	"testing"
+)
+
+func TestFactorialForNegativeValue(t *testing.T) {
+	g := NewGomegaWithT(t)
+	_, err := Factorial(-1)
+	g.Expect(err).Should(HaveOccurred())
+}
+
+func TestFactorialForZero(t *testing.T) {
+	g := NewGomegaWithT(t)
+	result, err := Factorial(0)
+	g.Expect(err).ShouldNot(HaveOccurred())
+	g.Expect(result).To(BeNumerically("==", 1))
+}
+
+func TestFactorialForOne(t *testing.T) {
+	g := NewGomegaWithT(t)
+	result, err := Factorial(0)
+	g.Expect(err).Should(Succeed())
+	g.Expect(result).To(BeNumerically("==", 1))
+}
+
+func TestFactorialForTen(t *testing.T) {
+	g := NewGomegaWithT(t)
+	g.Expect(Factorial(10)).To(BeNumerically("==", 3628800))
+}
+
+func TestFactorialForSmallNumber(t *testing.T) {
+	g := NewGomegaWithT(t)
+	g.Expect(Factorial(5)).To(SatisfyAll(BeNumerically(">=", 10), BeNumerically("<=", 10000)))
+}
diff --git a/testing/gomega/factorial5/go.mod b/testing/gomega/factorial5/go.mod
new file mode 100644
index 0000000..f649187
--- /dev/null
+++ b/testing/gomega/factorial5/go.mod
@@ -0,0 +1,3 @@
+module factorial.go
+
+require github.com/onsi/gomega v1.7.1
diff --git a/testing/gomega/factorial5/go.sum b/testing/gomega/factorial5/go.sum
new file mode 100644
index 0000000..5516e25
--- /dev/null
+++ b/testing/gomega/factorial5/go.sum
@@ -0,0 +1,17 @@
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+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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