Extract answers from arithmetic module

lib/koans/07_arithmetic.ex

@@ -2,53 +2,51 @@ defmodule Arithmetic do
   use Koans
 
   koan "it can add numbers" do
-    assert 3 + 4 == 7
+    assert 3 + :__ == 7
   end
 
   koan "it can substract numbers" do
-    assert 7 - 4 == 3
+    assert 7 - 4 == :__
   end
 
   koan "it can multiply" do
-    assert 3 * 4 == 12
+    assert 3 * 4 == :__
   end
 
   koan "floats and integers can be equal..." do
-    assert 3.0 == 3
+    assert 3.0 == :__
   end
 
   koan "..unless they are not precisely the same" do
-    assert 3.2 != 3
+    assert 3.2 != :__
   end
 
   koan "it does floating point division" do
-    assert 5 / 2 == 2.5
+    assert 5 / 2 == :__
   end
 
   koan "it does integer division" do
     numerator = 5
     denominator = 2
-    assert div(numerator, denominator) == 2
+    assert div(numerator, denominator) == :__
   end
 
   koan "it calculates the remainder of a division" do
     numerator = 5
     denominator = 2
-    assert rem(numerator, denominator) == 1
+    assert rem(numerator, denominator) == :__
   end
 
   koan "it finds the maximum in a list" do
-    assert Enum.max([1,2,3,4]) == 4
+    assert Enum.max([1,2,3,4]) == :__
-  end
-
-  koan "it can compare numbers" do
-    assert 5 > 2
-    assert 5 >= 5
-    assert 3 < 7
-    assert 5 <= 5
   end
 
   koan "it finds the minimum in a list" do
-    assert Enum.min([1,2,3,4]) == 1
+    assert Enum.min([1,2,3,4]) == :__
   end
+
+  koan "it can compare numbers" do
+    assert 5 > :__
+  end
+
 end

test/koans_harness_test.exs

@@ -97,6 +97,24 @@ defmodule KoansHarnessTest do
     test_all(Functions, answers)
   end
 
+  test "Arithmetic" do
+    answers = [
+      4,
+      3,
+      12,
+      3,
+      3,
+      2.5,
+      2,
+      1,
+      4,
+      1,
+      2
+    ]
+
+    test_all(Arithmetic, answers)
+  end
+
   def test_all(module, answers) do
     module.all_koans
     |> Enum.zip(answers)