diff --git a/app_regression_test.go b/app_regression_test.go
deleted file mode 100644
index 3c8681b..0000000
--- a/app_regression_test.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package cli
-
-import (
-	"testing"
-)
-
-// TestRegression tests a regression that was merged between versions 1.20.0 and 1.21.0
-// The included app.Run line worked in 1.20.0, and then was broken in 1.21.0.
-// Relevant PR: https://github.com/urfave/cli/pull/872
-func TestVersionOneTwoOneRegression(t *testing.T) {
-	testData := []struct {
-		testCase       string
-		appRunInput    []string
-		skipArgReorder bool
-	}{
-		{
-			testCase:    "with_dash_dash",
-			appRunInput: []string{"cli", "command", "--flagone", "flagvalue", "--", "docker", "image", "ls", "--no-trunc"},
-		},
-		{
-			testCase:       "with_dash_dash_and_skip_reorder",
-			appRunInput:    []string{"cli", "command", "--flagone", "flagvalue", "--", "docker", "image", "ls", "--no-trunc"},
-			skipArgReorder: true,
-		},
-		{
-			testCase:    "without_dash_dash",
-			appRunInput: []string{"cli", "command", "--flagone", "flagvalue", "docker", "image", "ls", "--no-trunc"},
-		},
-		{
-			testCase:       "without_dash_dash_and_skip_reorder",
-			appRunInput:    []string{"cli", "command", "--flagone", "flagvalue", "docker", "image", "ls", "--no-trunc"},
-			skipArgReorder: true,
-		},
-	}
-	for _, test := range testData {
-		t.Run(test.testCase, func(t *testing.T) {
-			// setup
-			app := NewApp()
-			app.Commands = []Command{{
-				Name:           "command",
-				SkipArgReorder: test.skipArgReorder,
-				Flags: []Flag{
-					StringFlag{
-						Name: "flagone",
-					},
-				},
-				Action: func(c *Context) error { return nil },
-			}}
-
-			// logic under test
-			err := app.Run(test.appRunInput)
-
-			// assertions
-			if err != nil {
-				t.Errorf("did not expected an error, but there was one: %s", err)
-			}
-		})
-	}
-}