Data commit

Task/Test-a-function/Ruby/test-a-function-2.rb

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+# palindrome.rb
+def palindrome?(s)
+  s == s.reverse
+end
+
+require 'minitest/spec'
+require 'minitest/autorun'
+describe "palindrome? function" do
+  it "returns true if arg is a palindrome" do
+    (palindrome? "aba").must_equal true
+  end
+
+  it "returns false if arg is not a palindrome" do
+    palindrome?("ab").must_equal false
+  end
+
+  it "raises NoMethodError if arg is without #reverse" do
+    proc { palindrome? 42 }.must_raise NoMethodError
+  end
+
+  it "raises ArgumentError if wrong number of args" do
+    proc { palindrome? "a", "b" }.must_raise ArgumentError
+  end
+
+  it "passes a failing test" do
+    palindrome?("ab").must_equal true, "this test case fails on purpose"
+  end
+end