primeiro commit com exercicios de Exercism realizados até esta data

go/hello-world/hello_world_test.go

@@ -0,0 +1,40 @@
+package greeting
+
+import "testing"
+
+// Define a function named HelloWorld that takes no arguments,
+// and returns a string.
+// In other words, define a function with the following signature:
+// HelloWorld() string
+
+func TestHelloWorld(t *testing.T) {
+	expected := "Hello, World!"
+	if observed := HelloWorld(); observed != expected {
+		t.Fatalf("HelloWorld() = %v, want %v", observed, expected)
+	}
+}
+
+// BenchmarkHelloWorld() is a benchmarking function. These functions follow the
+// form `func BenchmarkXxx(*testing.B)` and can be used to test the performance
+// of your implementation. They may not be present in every exercise, but when
+// they are you can run them by including the `-bench` flag with the `go test`
+// command, like so: `go test -v --bench . --benchmem`
+//
+// You will see output similar to the following:
+//
+// BenchmarkHelloWorld   	2000000000	         0.46 ns/op
+//
+// This means that the loop ran 2000000000 times at a speed of 0.46 ns per loop.
+//
+// While benchmarking can be useful to compare different iterations of the same
+// exercise, keep in mind that others will run the same benchmarks on different
+// machines, with different specs, so the results from these benchmark tests may
+// vary.
+func BenchmarkHelloWorld(b *testing.B) {
+	if testing.Short() {
+		b.Skip("skipping benchmark in short mode.")
+	}
+	for i := 0; i < b.N; i++ {
+		HelloWorld()
+	}
+}