Commented tests that show warnings that are not necessary for the cas…

…e to be tested

test/elixir_case_cond_if_test.exs

@@ -0,0 +1,129 @@
+defmodule CaseCondAndIfTest do
+  use ExUnit.Case
+
+  describe "case" do
+    test "matching tuple with case" do
+      result = case {1, 2, 3} do
+        {4, 5, 6} ->
+          "This clause won't match"
+        {1, _x, 3} ->
+          "This clause will match and bind _x to 2 in this clause"
+        _ ->
+          "This clause would match any value"
+      end
+      assert result == "This clause will match and bind _x to 2 in this clause"
+    end
+
+    # test "pattern match against an existing variable" do
+    #   x = 1
+    #   result = case 10 do
+    #     ^x -> "Won't match"
+    #     _ -> "Will match"
+    #   end
+    #   assert result == "Will match"
+    # end
+
+    test "case with guard clause" do
+      result = case {1, 2, 3} do
+        {1, x, 3} when x > 0 ->
+          "Will match"
+        _ ->
+          "Would match, if guard condition were not satisfied"
+      end
+      assert result == "Will match"
+    end
+
+    test "errors in guards do not leak" do
+      result = case 1 do
+        x when hd(x) -> "Won't match"
+        x -> "Got #{x}"
+      end
+      assert result == "Got 1"
+    end
+
+    # test "no matching case clause raises an error" do
+    #   assert_raise CaseClauseError, fn ->
+    #     case :ok do
+    #       :error -> "Won't match"
+    #     end
+    #   end
+    # end
+  end
+
+  describe "if/unless" do
+    test "if true condition" do
+      result = if true do
+        "This works!"
+      end
+      assert result == "This works!"
+    end
+
+    test "unless true condition" do
+      result = unless true do
+        "This will never be seen"
+      end
+      assert result == nil
+    end
+
+    test "if else condition" do
+      result = if nil do
+        "This won't be seen"
+      else
+        "This will"
+      end
+      assert result == "This will"
+    end
+
+    # test "variable scoping in if" do
+    #   x = 1
+    #   if true do
+    #     x = x + 1
+    #   end
+    #   assert x == 1
+    # end
+
+    test "return value from if to change value" do
+      x = 1
+      x = if true do
+        x + 1
+      else
+        x
+      end
+      assert x == 2
+    end
+  end
+
+  describe "cond" do
+    test "matching multiple conditions with cond" do
+      result = cond do
+        2 + 2 == 5 ->
+          "This will not be true"
+        2 * 2 == 3 ->
+          "Nor this"
+        1 + 1 == 2 ->
+          "But this will"
+      end
+      assert result == "But this will"
+    end
+
+    test "cond with final true condition" do
+      result = cond do
+        2 + 2 == 5 ->
+          "This is never true"
+        2 * 2 == 3 ->
+          "Nor this"
+        true ->
+          "This is always true (equivalent to else)"
+      end
+      assert result == "This is always true (equivalent to else)"
+    end
+
+    test "cond considers non-nil and non-false as true" do
+      result = cond do
+        hd([1, 2, 3]) ->
+          "1 is considered as true"
+      end
+      assert result == "1 is considered as true"
+    end
+  end
+end