From 619c6b215e4ddb006699b7d035702a6dd9de3089 Mon Sep 17 00:00:00 2001
From: Fabian Becker <fbecker18@bloomberg.net>
Date: Mon, 3 Jan 2022 12:50:52 +0100
Subject: [PATCH] Add hello package with tests

---
 hello/go.mod        |  3 +++
 hello/hello.go      | 33 +++++++++++++++++++++++++++++++++
 hello/hello_test.go | 28 ++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 hello/go.mod
 create mode 100644 hello/hello.go
 create mode 100644 hello/hello_test.go

diff --git a/hello/go.mod b/hello/go.mod
new file mode 100644
index 0000000..afdf576
--- /dev/null
+++ b/hello/go.mod
@@ -0,0 +1,3 @@
+module hello
+
+go 1.17
diff --git a/hello/hello.go b/hello/hello.go
new file mode 100644
index 0000000..8f2b2f3
--- /dev/null
+++ b/hello/hello.go
@@ -0,0 +1,33 @@
+package main
+
+import "fmt"
+
+const spanish = "Spanish"
+const french = "French"
+
+const englishHelloPrefix = "Hello, "
+const spanishHelloPrefix = "Hola, "
+const frenchHelloPrefix = "Bonjour, "
+
+func Hello(name string, language string) string {
+	if name == "" {
+		name = "World"
+	}
+
+	return greetingPrefix(language) + name
+}
+
+func greetingPrefix(language string) (prefix string) {
+	switch language {
+	case french:
+		prefix = frenchHelloPrefix
+	case spanish:
+		prefix = spanishHelloPrefix
+	default:
+		prefix = englishHelloPrefix
+	}
+	return
+}
+func main() {
+	fmt.Println(Hello("world", ""))
+}
diff --git a/hello/hello_test.go b/hello/hello_test.go
new file mode 100644
index 0000000..047f622
--- /dev/null
+++ b/hello/hello_test.go
@@ -0,0 +1,28 @@
+package main
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	assertCorrectMessage := func(t testing.TB, got, want string) {
+		t.Helper()
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	}
+
+	t.Run("saying hello to people", func(t *testing.T) {
+		got := Hello("Chris", "")
+		want := "Hello, Chris"
+		assertCorrectMessage(t, got, want)
+	})
+	t.Run("empty string defaults to 'World'", func(t *testing.T) {
+		got := Hello("", "")
+		want := "Hello, World"
+		assertCorrectMessage(t, got, want)
+	})
+	t.Run("in Spanish", func(t *testing.T) {
+		got := Hello("Elodie", "Spanish")
+		want := "Hola, Elodie"
+		assertCorrectMessage(t, got, want)
+	})
+}