diff --git a/lib/elixir/test/elixir/calendar/duration_test.exs b/lib/elixir/test/elixir/calendar/duration_test.exs
index e66cf001739..faa4671426d 100644
--- a/lib/elixir/test/elixir/calendar/duration_test.exs
+++ b/lib/elixir/test/elixir/calendar/duration_test.exs
@@ -432,4 +432,8 @@ defmodule DurationTest do
            ) ==
              "1year-2month-3day-4h-5min-6s"
   end
+
+  test "inspect/1" do
+    assert inspect(%Duration{hour: 5, minute: 3}) == "%Duration{hour: 5, minute: 3}"
+  end
 end
diff --git a/lib/elixir/test/elixir/json_test.exs b/lib/elixir/test/elixir/json_test.exs
index 2a0a8c61d6f..79bff828702 100644
--- a/lib/elixir/test/elixir/json_test.exs
+++ b/lib/elixir/test/elixir/json_test.exs
@@ -67,6 +67,7 @@ defmodule JSONTest do
     end
 
     test "atoms" do
+      assert protocol_encode(:another) == "\"another\""
       assert protocol_encode([nil, false, true, :another]) == "[null,false,true,\"another\"]"
     end
 
diff --git a/lib/elixir/test/elixir/stream_test.exs b/lib/elixir/test/elixir/stream_test.exs
index 47de51beb2a..47c0b771d92 100644
--- a/lib/elixir/test/elixir/stream_test.exs
+++ b/lib/elixir/test/elixir/stream_test.exs
@@ -1464,6 +1464,10 @@ defmodule StreamTest do
     assert Enum.zip(list, list) == Enum.zip(stream, stream)
   end
 
+  test "inspect/1" do
+    "#Stream<[enum: 1..10, funs: " <> _ = Stream.map(1..10, & &1) |> inspect()
+  end
+
   defp lazy?(stream) do
     match?(%Stream{}, stream) or is_function(stream, 2)
   end
diff --git a/lib/elixir/test/elixir/version_test.exs b/lib/elixir/test/elixir/version_test.exs
index 5f3fc5d2435..208f625f226 100644
--- a/lib/elixir/test/elixir/version_test.exs
+++ b/lib/elixir/test/elixir/version_test.exs
@@ -118,6 +118,14 @@ defmodule VersionTest do
     assert %Version{major: 1, minor: 0, patch: 0} |> Version.to_string() == "1.0.0"
   end
 
+  test "to_string/1 via protocol" do
+    assert Version.parse!("1.0.0") |> to_string() == "1.0.0"
+  end
+
+  test "inspect/1" do
+    assert Version.parse!("1.0.0") |> inspect() == "%Version{major: 1, minor: 0, patch: 0}"
+  end
+
   test "match?/2 with invalid versions" do
     assert_raise Version.InvalidVersionError, fn ->
       Version.match?("foo", "2.3.0")
@@ -317,22 +325,24 @@ defmodule VersionTest do
     assert Version.match?("0.7.0", req)
   end
 
-  test "compile_requirement/1" do
-    {:ok, req} = Version.parse_requirement("1.2.3")
-    assert req == Version.compile_requirement(req)
-  end
+  describe "requirement" do
+    test "compile_requirement/1" do
+      {:ok, req} = Version.parse_requirement("1.2.3")
+      assert req == Version.compile_requirement(req)
 
-  test "compile requirement" do
-    {:ok, req} = Version.parse_requirement("1.2.3")
-    req = Version.compile_requirement(req)
+      assert Version.match?("1.2.3", req)
+      refute Version.match?("1.2.4", req)
 
-    assert Version.match?("1.2.3", req)
-    refute Version.match?("1.2.4", req)
+      assert Version.parse_requirement("1 . 2 . 3") == :error
+      assert Version.parse_requirement("== >= 1.2.3") == :error
+      assert Version.parse_requirement("1.2.3 and or 4.5.6") == :error
+      assert Version.parse_requirement(">= 1") == :error
+      assert Version.parse_requirement("1.2.3 >=") == :error
+    end
 
-    assert Version.parse_requirement("1 . 2 . 3") == :error
-    assert Version.parse_requirement("== >= 1.2.3") == :error
-    assert Version.parse_requirement("1.2.3 and or 4.5.6") == :error
-    assert Version.parse_requirement(">= 1") == :error
-    assert Version.parse_requirement("1.2.3 >=") == :error
+    test "inspect/1" do
+      assert Version.parse_requirement!("1.0.0") |> inspect() ==
+               "Version.parse_requirement!(\"1.0.0\")"
+    end
   end
 end
diff --git a/lib/iex/test/iex/info_test.exs b/lib/iex/test/iex/info_test.exs
index 6df6dd804f7..b018ac178f8 100644
--- a/lib/iex/test/iex/info_test.exs
+++ b/lib/iex/test/iex/info_test.exs
@@ -247,6 +247,12 @@ defmodule IEx.InfoTest do
     assert get_key(info, "Reference modules") == "Range"
   end
 
+  test "maps" do
+    info = Info.info(%{foo: "bar"})
+    assert get_key(info, "Data type") == "Map"
+    assert get_key(info, "Reference modules") == "Map"
+  end
+
   test "structs" do
     info = Info.info(%Foo{})
     assert get_key(info, "Data type") == "IEx.InfoTest.Foo"