Fix password complexity regex for special characters (on master) (#8525)

* Fix extra space

* Fix regular expression

* Fix error template name

* Simplify check code, fix default values, add test

* Fix router tests

* Fix fmt

* Fix setting and lint

* Move cleaning up code to test, improve comments

* Tidy up variable declaration

modules/password/password_test.go

@@ -0,0 +1,75 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package password
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestComplexity_IsComplexEnough(t *testing.T) {
+	matchComplexityOnce.Do(func() {})
+
+	testlist := []struct {
+		complexity  []string
+		truevalues  []string
+		falsevalues []string
+	}{
+		{[]string{"lower"}, []string{"abc", "abc!"}, []string{"ABC", "123", "=!$", ""}},
+		{[]string{"upper"}, []string{"ABC"}, []string{"abc", "123", "=!$", "abc!", ""}},
+		{[]string{"digit"}, []string{"123"}, []string{"abc", "ABC", "=!$", "abc!", ""}},
+		{[]string{"spec"}, []string{"=!$", "abc!"}, []string{"abc", "ABC", "123", ""}},
+		{[]string{"off"}, []string{"abc", "ABC", "123", "=!$", "abc!", ""}, nil},
+		{[]string{"lower", "spec"}, []string{"abc!"}, []string{"abc", "ABC", "123", "=!$", "abcABC123", ""}},
+		{[]string{"lower", "upper", "digit"}, []string{"abcABC123"}, []string{"abc", "ABC", "123", "=!$", "abc!", ""}},
+	}
+
+	for _, test := range testlist {
+		testComplextity(test.complexity)
+		for _, val := range test.truevalues {
+			assert.True(t, IsComplexEnough(val))
+		}
+		for _, val := range test.falsevalues {
+			assert.False(t, IsComplexEnough(val))
+		}
+	}
+
+	// Remove settings for other tests
+	testComplextity([]string{"off"})
+}
+
+func TestComplexity_Generate(t *testing.T) {
+	matchComplexityOnce.Do(func() {})
+
+	const maxCount = 50
+	const pwdLen = 50
+
+	test := func(t *testing.T, modes []string) {
+		testComplextity(modes)
+		for i := 0; i < maxCount; i++ {
+			pwd, err := Generate(pwdLen)
+			assert.NoError(t, err)
+			assert.Equal(t, pwdLen, len(pwd))
+			assert.True(t, IsComplexEnough(pwd), "Failed complexities with modes %+v for generated: %s", modes, pwd)
+		}
+	}
+
+	test(t, []string{"lower"})
+	test(t, []string{"upper"})
+	test(t, []string{"lower", "upper", "spec"})
+	test(t, []string{"off"})
+	test(t, []string{""})
+
+	// Remove settings for other tests
+	testComplextity([]string{"off"})
+}
+
+func testComplextity(values []string) {
+	// Cleanup previous values
+	validChars = ""
+	requiredChars = make([]string, 0, len(values))
+	setupComplexity(values)
+}