Added Elixir anonymous funtions tests

test/elixir_anonymous_functions_test.exs

@@ -0,0 +1,57 @@
+defmodule AnonymousFunctionsTest do
+  use ExUnit.Case
+
+  test "defining and invoking anonymous functions" do
+    add = fn a, b -> a + b end
+    assert add.(1, 2) == 3
+    assert is_function(add)
+    assert is_function(add, 2)
+    refute is_function(add, 1)
+  end
+
+  test "closures in anonymous functions" do
+    add = fn a, b -> a + b end
+    double = fn a -> add.(a, a) end
+    assert double.(2) == 4
+
+    x = 42
+    # assert (fn -> x = 0 end).() == 0
+    assert x == 42
+  end
+
+  test "anonymous functions with clauses and guards" do
+    addOrMultiply = fn
+      x, y when x > 0 -> x + y
+      x, y -> x * y
+    end
+
+    assert addOrMultiply.(1, 3) == 4
+    assert addOrMultiply.(-1, 3) == -3
+
+    # assert_raise CompileError, fn ->
+    #   f2 = fn
+    #     x, y when x > 0 -> x + y
+    #     x, y, z -> x * y + z
+    #   end
+    # end
+  end
+
+  test "capturing functions with the capture operator" do
+    fun = &is_atom/1
+    assert is_function(fun)
+    assert fun.(:hello)
+    refute fun.(123)
+
+    fun = &String.length/1
+    assert fun.("hello") == 5
+
+    add = &+/2
+    assert add.(1, 2) == 3
+
+    fun = &(&1 + 1)
+    assert fun.(1) == 2
+
+    fun2 = &"Good #{&1}"
+    assert fun2.("morning") == "Good morning"
+  end
+end