Rename and clean the ASTMangler to Blanks

test/blanks_test.exs

@@ -0,0 +1,54 @@
+defmodule BlanksTest do
+  use ExUnit.Case, async: true
+
+  test "simple replacement" do
+    ast = quote do: 1 + :__
+
+    mangled = Blanks.replace(ast, 37)
+    assert {:+, [context: BlanksTest, import: Kernel], [1, 37]} == mangled
+  end
+
+  test "Work with multiple different replacements" do
+    [koan | _] = SampleKoan.all_koans
+    assert :ok == apply(SampleKoan, koan, [{:multiple, [3,4]}])
+  end
+
+  def complex_example do
+    [head | tail] = [1,2,3,4]
+
+    assert head == 1
+    assert tail == [2,3,4]
+  end
+
+  def foo(answer) do
+    if answer == :yes do
+      :bar
+    else
+      :batz
+    end
+  end
+
+  test "complex example" do
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [true, :__]}]}]
+
+    assert [do: {:assert, [line: 5], [{:==, [line: 5], [true, true]}]}] == Blanks.replace(ast, true)
+  end
+
+  test "multiple arguments" do
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [:__, :__]}]}]
+
+    assert [do: {:assert, [line: 5], [{:==, [line: 5], [true, false]}]}] == Blanks.replace(ast, [true, false])
+  end
+
+  test "counts simple blanks" do
+    ast = quote do: 1 + :__
+
+    assert Blanks.count(ast) == 1
+  end
+
+  test "counts multiple blanks" do
+    ast = [do: {:assert, [line: 5], [{:==, [line: 5], [:__, :__]}]}]
+
+    assert Blanks.count(ast) == 2
+  end
+end