added tests for method parameters.

about/method_parameters.rb

@@ -0,0 +1,38 @@
+require 'minitest/autorun'
+
+class MethodsPlayground < Minitest::Test
+
+# tests methods with varargs, hashes and named parameters
+
+  def test_param
+    def method_param(x,y=1)
+      return x * y
+    end
+
+    assert_equal 1, method_param(1)
+    assert_equal 10, method_param(2,5)
+  end
+
+  def test_varargs
+    def method_varargs(x, *varags)
+      return varags
+    end
+
+    assert_equal [2,3,4], method_varargs(1,2,3,4)
+  end
+
+  # A Hash is a dictionary-like collection of unique keys and their values.
+  # Also called associative arrays, they are similar to Arrays, but where an
+  # Array uses integers as its index, a Hash allows you to use any object type.
+  def test_hashes
+    def method_hash(hash = {})
+      return hash
+    end
+
+    returnVal = method_hash(name: "John Doe", age: 48, size: 175.3)
+
+    assert_equal "John Doe", returnVal[:name]
+    assert_equal 175.3, returnVal[:size]
+  end
+
+end