Initial: Go app with tests + CI workflow

main_test.go

@@ -0,0 +1,28 @@
+package main
+
+import "testing"
+
+func TestAdd(t *testing.T) {
+    tests := []struct {
+        a, b, want int
+    }{
+        {2, 3, 5},
+        {0, 0, 0},
+        {-1, 1, 0},
+        {100, 200, 300},
+    }
+    for _, tt := range tests {
+        got := Add(tt.a, tt.b)
+        if got != tt.want {
+            t.Errorf("Add(%d, %d) = %d, want %d", tt.a, tt.b, got, tt.want)
+        }
+    }
+}
+
+func TestGreet(t *testing.T) {
+    got := Greet("World")
+    want := "Hello, World!"
+    if got != want {
+        t.Errorf("Greet(World) = %q, want %q", got, want)
+    }
+}