Updated hello_world problem to reflect exercism/problem-specification…

…s#520 (#370)

* Updated hello_world problem to reflect exercism/problem-specifications#520

exercism/problem-specifications#520

* Adding example

exercises/hello-world/README.md

@@ -19,32 +19,7 @@ If everything goes well, you will be ready to fetch your first real exercise.
 Execute the tests with:
 
 ```bash
-$ elixir bob_test.exs
-```
-
-(Replace `bob_test.exs` with the name of the test file.)
-
-### Pending tests
-
-In the test suites, all but the first test have been skipped.
-
-Once you get a test passing, you can unskip the next one by
-commenting out the relevant `@tag :pending` with a `#` symbol.
-
-For example:
-
-```elixir
-# @tag :pending
-test "shouting" do
-  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
-end
-```
-
-Or, you can enable all the tests by commenting out the
-`ExUnit.configure` line in the test suite.
-
-```elixir
-# ExUnit.configure exclude: :pending, trace: true
+$ elixir hello_world_test.exs
 ```
 
 For more detailed information about the Elixir track, please

exercises/hello-world/example.exs

@@ -1,13 +1,9 @@
 defmodule HelloWorld do
-
   @doc """
   Greets the user by name, or by saying "Hello, World!"
   if no name is given
   """
-
-  def hello(name \\ "World") do
-
-    "Hello, " <> name <> "!"
-
+  def hello do
+    "Hello, World!"
   end
-end
+ end

exercises/hello-world/hello_world.exs

@@ -1,31 +1,9 @@
 defmodule HelloWorld do
-  @moduledoc """
-  Elixir counts the number of arguments as part of the function name.
-  For instance;
-
-      def hello() do
-      end
-
-  would be a completely different function from
-
-      def hello(name) do
-      end
-
-  Can you find a way to make all the tests pass with just one
-  function?
-
-  Hint: look into argument defaults here:
-  http://elixir-lang.org/getting-started/modules-and-functions.html#default-arguments
-  """
-
   @doc """
-  Greets the user by name, or by saying "Hello, World!"
-  if no name is given.
+  Simply returns "Hello, world!"
   """
-  @spec hello(String.t) :: String.t
-  def hello(name) do
-
+  @spec hello :: String.t
+  def hello do
     "Your implementation goes here"
-
   end
 end

exercises/hello-world/hello_world_test.exs

@@ -3,23 +3,12 @@ if !System.get_env("EXERCISM_TEST_EXAMPLES") do
 end
 
 ExUnit.start
-ExUnit.configure exclude: :pending, trace: true
+ExUnit.configure trace: true
 
 defmodule HelloWorldTest do
   use ExUnit.Case
 
-  test "says hello with no name" do
+  test "says 'Hello, World!'" do
     assert HelloWorld.hello() == "Hello, World!"
   end
-
-  @tag :pending
-  test "says hello sample name" do
-    assert HelloWorld.hello("Alice") == "Hello, Alice!"
-  end
-
-  @tag :pending
-  test "says hello other sample name" do
-    assert HelloWorld.hello("Bob") == "Hello, Bob!"
-  end
-
 end

mix.lock

@@ -1 +1 @@
-%{"poison": {:hex, :poison, "1.4.0"}}
+%{"poison": {:hex, :poison, "1.4.0", "cd5afb9db7f0d19487572fa28185b6d4de647f14235746824e77b3139b79b725", [], [], "hexpm"}}