These tests, they suck

test/unit/puzzle_test.rb

@@ -1,8 +1,45 @@
 require 'test_helper'
 
 class PuzzleTest < ActiveSupport::TestCase
-  # Replace this with your real tests.
-  test "the truth" do
-    assert true
+  test "Puzzle#file= should write a SHA1 fingerprint" do
+    tempfile = Tempfile.new("puzzle_sample")
+    tempfile << "Sample Text"
+    tempfile.rewind
+
+    expected_fingerprint = Digest::SHA1.hexdigest(tempfile.read)
+    tempfile.rewind
+
+    puzzle = Puzzle.new(:file => tempfile)
+
+    assert_equal expected_fingerprint, puzzle.fingerprint
   end
+
+  test "puzzle#valid_solution? should return true if contents match" do
+    seed_tempfile = Tempfile.new("puzzle_sample")
+    seed_tempfile << "sample text"
+    seed_tempfile.rewind
+
+    test_tempfile = Tempfile.new("puzzle_sample2")
+    test_tempfile << "sample text"
+    test_tempfile.rewind
+
+    puzzle = Puzzle.new(:file => seed_tempfile)
+
+    assert puzzle.valid_solution?(test_tempfile)
+  end 
+
+  test "puzzle#valid_solution? should return false if contents don't match" do
+    seed_tempfile = Tempfile.new("puzzle_sample")
+    seed_tempfile << "sample text"
+    seed_tempfile.rewind
+
+    test_tempfile = Tempfile.new("puzzle_sample2")
+    test_tempfile << "wow, this totally doesn't match, buddy"
+    test_tempfile.rewind
+
+    puzzle = Puzzle.new(:file => seed_tempfile)
+
+    assert !puzzle.valid_solution?(test_tempfile)
+  end 
+
 end