diff --git a/lib/credo/check/consistency/space_around_operators.ex b/lib/credo/check/consistency/space_around_operators.ex
index 1824c61b2..66ec78d18 100644
--- a/lib/credo/check/consistency/space_around_operators.ex
+++ b/lib/credo/check/consistency/space_around_operators.ex
@@ -29,11 +29,6 @@ defmodule Credo.Check.Consistency.SpaceAroundOperators do
 
   @collector Credo.Check.Consistency.SpaceAroundOperators.Collector
 
-  # TODO: add *ignored* operators, so you can add "|" and still write
-  #       [head|tail] while enforcing 2 + 3 / 1 ...
-  # FIXME: this seems to be already implemented, but there don't seem to be
-  # any related test cases around.
-
   @doc false
   @impl true
   def run_on_all_source_files(exec, source_files, params) do
diff --git a/test/credo/check/consistency/line_endings_test.exs b/test/credo/check/consistency/line_endings_test.exs
index 357fca799..4299c65bd 100644
--- a/test/credo/check/consistency/line_endings_test.exs
+++ b/test/credo/check/consistency/line_endings_test.exs
@@ -57,4 +57,13 @@ defmodule Credo.Check.Consistency.LineEndingsTest do
       assert issue.trigger == "\r\n"
     end)
   end
+
+  test "it should report an issue here when there is no problem, but the :force param specifies the other kind of line ending" do
+    [@windows_line_endings]
+    |> to_source_files
+    |> run_check(@described_check, force: :unix)
+    |> assert_issue(fn issue ->
+      assert issue.trigger == "\r\n"
+    end)
+  end
 end
diff --git a/test/credo/check/consistency/parameter_pattern_matching_test.exs b/test/credo/check/consistency/parameter_pattern_matching_test.exs
index b601e4277..ec7aa60c5 100644
--- a/test/credo/check/consistency/parameter_pattern_matching_test.exs
+++ b/test/credo/check/consistency/parameter_pattern_matching_test.exs
@@ -166,4 +166,19 @@ defmodule Credo.Check.Consistency.ParameterPatternMatchingTest do
 
     assert 3 == Enum.count(issues)
   end
+
+  test "it should report issues when variable declarations are inconsistent throughout sourcefiles (forcing left side)" do
+    issues =
+      [
+        @var_right_map,
+        @var_right_struct,
+        @var_right_list,
+        @var_left_map
+      ]
+      |> to_source_files
+      |> run_check(@described_check, force: :before)
+      |> assert_issues()
+
+    assert 3 == Enum.count(issues)
+  end
 end
diff --git a/test/credo/check/consistency/space_around_operators_test.exs b/test/credo/check/consistency/space_around_operators_test.exs
index 39a7190c7..ce457044b 100644
--- a/test/credo/check/consistency/space_around_operators_test.exs
+++ b/test/credo/check/consistency/space_around_operators_test.exs
@@ -436,4 +436,29 @@ defmodule Credo.Check.Consistency.SpaceAroundOperatorsTest do
     |> run_check(@described_check)
     |> refute_issues()
   end
+
+  test "it should allow no spaces if specified in :ignore" do
+    source_files =
+      [
+        ~S"""
+        defmodule TestTest do
+          def test(a, b, c) do
+            a = fn b, c -> b+c end
+
+            a.(-30, 10)
+            a.(-3.0, 1.0)
+          end
+        end
+        """
+      ]
+      |> to_source_files()
+
+    source_files
+    |> run_check(@described_check)
+    |> assert_issue()
+
+    source_files
+    |> run_check(@described_check, ignore: [:+])
+    |> refute_issues()
+  end
 end
diff --git a/test/credo/check/consistency/unused_variable_names_test.exs b/test/credo/check/consistency/unused_variable_names_test.exs
index 09721957e..6c7e6e890 100644
--- a/test/credo/check/consistency/unused_variable_names_test.exs
+++ b/test/credo/check/consistency/unused_variable_names_test.exs
@@ -220,4 +220,44 @@ defmodule Credo.Check.Consistency.UnusedVariableNamesTest do
       assert 3 == issue.line_no
     end)
   end
+
+  test "it should report a violation for naming schemes other than the forced one" do
+    [
+      """
+      defmodule Credo.SampleOne do
+        defmodule Foo do
+          def bar(name, _) when is_binary(name) do
+            case name do
+              "foo" <> _name -> "FOO"
+              "bar" <> _name -> "BAR"
+              _name -> "DEFAULT"
+            end
+          end
+        end
+      end
+      """,
+      """
+      defmodule Credo.SampleTwo do
+        defmodule Foo do
+          def bar(list) do
+            Enum.map(list, fn _item -> 1 end)
+          end
+        end
+      end
+      """
+    ]
+    |> to_source_files
+    |> run_check(@described_check, force: :anonymous)
+    |> assert_issues(fn issues ->
+      assert Enum.count(issues) == 4
+
+      assert Enum.any?(issues, fn issue ->
+               issue.trigger == "_name"
+             end)
+
+      assert Enum.any?(issues, fn issue ->
+               issue.trigger == "_item"
+             end)
+    end)
+  end
 end
diff --git a/test/credo/check/design/alias_usage_test.exs b/test/credo/check/design/alias_usage_test.exs
index a35fb4d5d..806ecf112 100644
--- a/test/credo/check/design/alias_usage_test.exs
+++ b/test/credo/check/design/alias_usage_test.exs
@@ -183,6 +183,32 @@ defmodule Credo.Check.Design.AliasUsageTest do
     |> refute_issues()
   end
 
+  test "it should NOT report violation when module is included in only parameter but is also in excluded_lastnames" do
+    """
+    defmodule Test do
+      def just_an_example do
+        Credo.Foo.Bar.call
+      end
+    end
+    """
+    |> to_source_file
+    |> run_check(@described_check, only: ~r/^Credo.+$/, excluded_lastnames: ["Bar"])
+    |> refute_issues()
+  end
+
+  test "it should NOT report violation when module is covered in excluded_lastnames" do
+    """
+    defmodule Test do
+      def just_an_example do
+        Credo.Foo.Bar.call
+      end
+    end
+    """
+    |> to_source_file
+    |> run_check(@described_check, excluded_lastnames: ["Bar"])
+    |> refute_issues()
+  end
+
   test "it should NOT report with __MODULE__" do
     """
     defmodule Test do
diff --git a/test/credo/check/design/tag_fixme_test.exs b/test/credo/check/design/tag_fixme_test.exs
index bc2bdb504..b38298fa8 100644
--- a/test/credo/check/design/tag_fixme_test.exs
+++ b/test/credo/check/design/tag_fixme_test.exs
@@ -61,12 +61,12 @@ defmodule Credo.Check.Design.TagFIXMETest do
   end
 
   test "it should report a couple of issues" do
-    """
+    ~S'''
     defmodule CredoSampleModule do
       use ExUnit.Case # FIXME: this is the first
-      @moduledoc \"\"\"
+      @moduledoc """
         this is an example # FIXME: and this is no actual comment
-      \"\"\"
+      """
 
       def some_fun do # FIXME this is the second
         x = ~s{also: # FIXME: no comment here}
@@ -76,11 +76,35 @@ defmodule Credo.Check.Design.TagFIXMETest do
         "also: # FIXME: no comment here as well"
       end
     end
-    """
+    '''
     |> to_source_file
     |> run_check(@described_check)
     |> assert_issues(fn issues ->
-      assert 3 == Enum.count(issues)
+      assert Enum.count(issues) == 3
+    end)
+  end
+
+  test "it should report a couple of issues when including docstrings" do
+    ~S'''
+    defmodule CredoSampleModule do
+      use ExUnit.Case # FIXME: this is the first
+
+      @doc """
+      FIXME: and this is no actual comment
+      """
+      def some_fun do # FIXME this is the second
+        x = ~s{also: # FIXME: no comment here}
+        assert 2 == x
+        ?" # FIXME: this is the third
+
+        "also: # FIXME: no comment here as well"
+      end
+    end
+    '''
+    |> to_source_file
+    |> run_check(@described_check, include_doc: true)
+    |> assert_issues(fn issues ->
+      assert Enum.count(issues) == 4
     end)
   end
 end
diff --git a/test/credo/check/design/tag_todo_test.exs b/test/credo/check/design/tag_todo_test.exs
index 7cd0b6b09..0a215d0a9 100644
--- a/test/credo/check/design/tag_todo_test.exs
+++ b/test/credo/check/design/tag_todo_test.exs
@@ -247,7 +247,31 @@ defmodule Credo.Check.Design.TagTODOTest do
     |> to_source_file
     |> run_check(@described_check)
     |> assert_issues(fn issues ->
-      assert 3 == Enum.count(issues)
+      assert Enum.count(issues) == 3
+    end)
+  end
+
+  test "it should report a couple of issues when including docs" do
+    ~S'''
+    defmodule CredoSampleModule do
+      use ExUnit.Case # TODO: this is the first
+
+      @doc """
+      TODO: and this is an actual TODO
+      """
+      def some_fun do # TODO this is the second
+        x = ~s{also: # TODO: no comment here}
+        assert 2 == x
+        ?" # TODO: this is the third
+
+        "also: # TODO: no comment here as well"
+      end
+    end
+    '''
+    |> to_source_file
+    |> run_check(@described_check, include_doc: true)
+    |> assert_issues(fn issues ->
+      assert Enum.count(issues) == 4
     end)
   end
 end
diff --git a/test/credo/check/housekeeping_params.exs b/test/credo/check/housekeeping_params.exs
index a8ac6c8a3..bf95addcc 100644
--- a/test/credo/check/housekeeping_params.exs
+++ b/test/credo/check/housekeeping_params.exs
@@ -23,7 +23,7 @@ defmodule Ast do
   end
 end
 
-defmodule Credo.Check.HousekeepingHeredocsInTestsTest do
+defmodule Credo.Check.HousekeepingParamsTest do
   use Credo.Test.Case
 
   require Ast
@@ -34,7 +34,9 @@ defmodule Credo.Check.HousekeepingHeredocsInTestsTest do
     errors =
       Path.join(__DIR__, "*/**/*_test.exs")
       |> Path.wildcard()
-      |> Enum.reject(&String.match?(&1, ~r/(collector|helper)/))
+      |> Enum.reject(
+        &String.match?(&1, ~r/(collector|helper|duplicated_code|perceived_complexity)/)
+      )
       |> Enum.map(&{&1, File.read!(&1)})
       |> Enum.map(fn {filename, test_source} ->
         check_filename =
@@ -68,10 +70,11 @@ defmodule Credo.Check.HousekeepingHeredocsInTestsTest do
             end
           end
 
-        untested_params = all_param_names -- tested_params
+        untested_params =
+          (all_param_names -- tested_params) -- Credo.Check.Params.builtin_param_names()
 
         if check_source != "" && untested_params != [] do
-          "- #{Credo.Code.Module.name(check_ast)} - untested params: #{inspect(untested_params)}"
+          "- #{Path.relative_to_cwd(filename)}:1 - untested params: #{inspect(untested_params)}"
         end
       end)
       |> Enum.reject(&is_nil/1)
diff --git a/test/credo/check/readability/max_line_length_test.exs b/test/credo/check/readability/max_line_length_test.exs
index 08ca51c66..911b21eab 100644
--- a/test/credo/check/readability/max_line_length_test.exs
+++ b/test/credo/check/readability/max_line_length_test.exs
@@ -102,6 +102,42 @@ defmodule Credo.Check.Readability.MaxLineLengthTest do
     |> refute_issues()
   end
 
+  test "it should NOT report a violation if heredocs are excluded" do
+    ~S'''
+    defmodule CredoSampleModule do
+      use ExUnit.Case
+
+      def some_fun do
+        IO.puts 1
+        """
+        long string, right? 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 == 2
+        """
+        IO.puts 2
+      end
+    end
+    '''
+    |> to_source_file
+    |> run_check(@described_check, max_length: 80, ignore_heredocs: true)
+    |> refute_issues()
+  end
+
+  test "it should NOT report a violation if sigils are excluded" do
+    ~S'''
+    defmodule CredoSampleModule do
+      use ExUnit.Case
+
+      def some_fun do
+        IO.puts 1
+        ~s(long string, right? 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 == 2)
+        IO.puts 2
+      end
+    end
+    '''
+    |> to_source_file
+    |> run_check(@described_check, max_length: 80, ignore_sigils: true)
+    |> refute_issues()
+  end
+
   test "it should NOT report a violation if strings are excluded for heredocs" do
     """
     defmodule CredoSampleModule do
diff --git a/test/credo/check/readability/module_doc_test.exs b/test/credo/check/readability/module_doc_test.exs
index 47b138fd1..a8c08a1ee 100644
--- a/test/credo/check/readability/module_doc_test.exs
+++ b/test/credo/check/readability/module_doc_test.exs
@@ -108,4 +108,16 @@ defmodule Credo.Check.Readability.ModuleDocTest do
       assert issue.trigger == "Person"
     end)
   end
+
+  test "it should report controller submodules when the :ignore_names param says so" do
+    """
+    defmodule MyApp.SomePhoenixController do
+      defmodule SubModule do
+      end
+    end
+    """
+    |> to_source_file
+    |> run_check(@described_check, ignore_names: [])
+    |> assert_issues()
+  end
 end
diff --git a/test/credo/check/refactor/abc_size_test.exs b/test/credo/check/refactor/abc_size_test.exs
index a6f14a64f..f5cf46f81 100644
--- a/test/credo/check/refactor/abc_size_test.exs
+++ b/test/credo/check/refactor/abc_size_test.exs
@@ -177,6 +177,31 @@ defmodule Credo.Check.Refactor.ABCSizeTest do
     end)
   end
 
+  test "it should NOT report count ecto functions when ecto functions are excluded via :excluded_functions" do
+    """
+    defmodule CredoEctoQueryModule do
+
+      def foobar() do
+        Favorite
+        |> where(user_id: ^user.id)
+        |> join(:left, [f], t in Template, f.entity_id == t.id and f.entity_type == "template")
+        |> join(:left, [f, t], d in Document, f.entity_id == d.id and f.entity_type == "document")
+        |> join(:left, [f, t, d], dt in Template, dt.id == d.template_id)
+        |> join(:left, [f, t, d, dt], c in Category, c.id == t.category_id or c.id == dt.category_id)
+        |> select([f, t, d, dt, c], c)
+        |> distinct(true)
+        |> Repo.all()
+      end
+    end
+    """
+    |> to_source_file
+    |> run_check(@described_check,
+      max_size: 3,
+      excluded_functions: ["where", "from", "select", "join"]
+    )
+    |> refute_issues()
+  end
+
   #
   # ABC size unit tests
   #
diff --git a/test/credo/check/refactor/nesting_test.exs b/test/credo/check/refactor/nesting_test.exs
index e69703871..8d43a76b5 100644
--- a/test/credo/check/refactor/nesting_test.exs
+++ b/test/credo/check/refactor/nesting_test.exs
@@ -63,6 +63,29 @@ defmodule Credo.Check.Refactor.NestingTest do
     |> refute_issues()
   end
 
+  test "it should NOT report when :max_nesting is used properly" do
+    """
+    defmodule CredoSampleModule do
+      defp foo() do
+        if true do
+          "flat"
+        else
+          if true do
+            if true do
+              if true do
+                "nested"
+              end
+            end
+          end
+        end
+      end
+    end
+    """
+    |> to_source_file
+    |> run_check(@described_check, max_nesting: 4)
+    |> refute_issues()
+  end
+
   #
   # cases raising issues
   #