diff --git a/Add_28d8c9c450_test.go b/Add_28d8c9c450_test.go
new file mode 100644
index 0000000..053d3f4
--- /dev/null
+++ b/Add_28d8c9c450_test.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestAdd_28d8c9c450(t *testing.T) {
+	t.Run("positive numbers", func(t *testing.T) {
+		result := Add_28d8c9c450(2, 3)
+		if result != 5 {
+			t.Errorf("Expected 5, but got %d", result)
+		} else {
+			t.Log("Success: TestAdd_28d8c9c450 for positive numbers passed.")
+		}
+	})
+
+	t.Run("negative numbers", func(t *testing.T) {
+		result := Add_28d8c9c450(-2, -3)
+		if result != -5 {
+			t.Errorf("Expected -5, but got %d", result)
+		} else {
+			t.Log("Success: TestAdd_28d8c9c450 for negative numbers passed.")
+		}
+	})
+
+	t.Run("zero", func(t *testing.T) {
+		result := Add_28d8c9c450(0, 0)
+		if result != 0 {
+			t.Errorf("Expected 0, but got %d", result)
+		} else {
+			t.Log("Success: TestAdd_28d8c9c450 for zero passed.")
+		}
+	})
+
+	t.Run("positive and negative", func(t *testing.T) {
+		result := Add_28d8c9c450(2, -3)
+		if result != -1 {
+			t.Errorf("Expected -1, but got %d", result)
+		} else {
+			t.Log("Success: TestAdd_28d8c9c450 for positive and negative passed.")
+		}
+	})
+}
+
+func Add_28d8c9c450(a, b int) int {
+	return a + b
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..40ec89a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module learning-golang
+
+go 1.19
+
+require github.com/smartystreets/goconvey v1.8.1
+
+require (
+	github.com/gopherjs/gopherjs v1.17.2 // indirect
+	github.com/jtolds/gls v4.20.0+incompatible // indirect
+	github.com/smarty/assertions v1.15.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..7fea79b
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,8 @@
+github.com/gopherjs/gopherjs v1.17.2 h1:fQnZVsXk8uxXIStYb0N4bGk7jeyTalG/wsZjQ25dO0g=
+github.com/gopherjs/gopherjs v1.17.2/go.mod h1:pRRIvn/QzFLrKfvEz3qUuEhtE/zLCWfreZ6J5gM2i+k=
+github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/smarty/assertions v1.15.0 h1:cR//PqUBUiQRakZWqBiFFQ9wb8emQGDb0HeGdqGByCY=
+github.com/smarty/assertions v1.15.0/go.mod h1:yABtdzeQs6l1brC900WlRNwj6ZR55d7B+E8C6HtKdec=
+github.com/smartystreets/goconvey v1.8.1 h1:qGjIddxOk4grTu9JPOU31tVfq3cNdBlNa5sSznIX1xY=
+github.com/smartystreets/goconvey v1.8.1/go.mod h1:+/u4qLyY6x1jReYOp7GOM2FSt8aP9CzCZL03bI28W60=