Merge pull request #69 from wneessen/add_fuzzing

Add fuzzing

.github/workflows/codecov.yml

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: CC0-1.0
 
 name: Codecov workflow
+permissions: read-all
 on:
   push:
     branches:

.github/workflows/codeql.yml

@@ -0,0 +1,91 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '31 14 * * 1'
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze
+    # Runner size impacts CodeQL analysis time. To learn more, please see:
+    #   - https://gh.io/recommended-hardware-resources-for-running-codeql
+    #   - https://gh.io/supported-runners-and-hardware-resources
+    #   - https://gh.io/using-larger-runners
+    # Consider using larger runners for possible analysis time improvements.
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+    timeout-minutes: ${{ (matrix.language == 'swift' && 120) || 360 }}
+    permissions:
+      # required for all workflows
+      security-events: write
+
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'c-cpp', 'csharp', 'go', 'java-kotlin', 'javascript-typescript', 'python', 'ruby', 'swift' ]
+        # Use only 'java-kotlin' to analyze code written in Java, Kotlin or both
+        # Use only 'javascript-typescript' to analyze code written in JavaScript, TypeScript or both
+        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+
+        # For more details on CodeQL's query packs, refer to: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+        # queries: security-extended,security-and-quality
+
+
+    # Autobuild attempts to build any compiled languages (C/C++, C#, Go, Java, or Swift).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    # - name: Autobuild
+    #  uses: github/codeql-action/autobuild@v3
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    #   If the Autobuild fails above, remove it and uncomment the following three lines.
+    #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
+
+    - run: |
+        echo "Build Application using Go"
+        /usr/bin/env GOTOOLCHAIN=go1.22.1+auto go build -a -installsuffix cgo -ldflags '-w -s -extldflags "-static"' -o apg github.com/wneessen/apg-go/cmd/apg
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"

.github/workflows/docker-publish.yml

@@ -19,6 +19,9 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
+
 env:
   # Use docker.io for Docker Hub if empty
   REGISTRY: ghcr.io

.github/workflows/reuse.yml

@@ -3,6 +3,8 @@
 # SPDX-License-Identifier: CC0-1.0
 
 name: REUSE Compliance Check
+permissions:
+  contents: read
 
 on: [push, pull_request]
 

.github/workflows/scorecard.yml

@@ -0,0 +1,76 @@
+# SPDX-FileCopyrightText: 2022 Winni Neessen <winni@neessen.dev>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '34 15 * * 4'
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      # Uncomment the permissions below if installing in a private repository.
+      # contents: read
+      # actions: read
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@e38b1902ae4f44df626f11ba0734b14fb91f8f86 # v2.1.2
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecard on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action#authentication-with-pat.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@17573ee1cc1b9d061760f3a006fc4aac4f944fd5 # v2.2.4
+        with:
+          sarif_file: results.sarif

.github/workflows/sonarqube.yml

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: CC0-1.0
 
 name: SonarQube
+permissions: read-all
 on:
   push:
     branches:

README.md

@@ -49,6 +49,14 @@ vEbErlaFryaNgyex (vE-bEr-la-Fry-aN-gy-ex)
 We generated a 15-character long pronounceable phrase with syllables output, for easy
 use in e. g. a phone verification process.
 
+### Cryptographic key for encryption
+```shell
+$ apg -a 3 -f 32 -bh
+```
+We generated a 32 bytes/256 bits long fully binary secret that can be used i. e. as
+encryption key for a AES-256 symmetric encryption. The output is represented in 
+hexadecimal format.
+
 ## Installation
 
 ### Docker
@@ -327,6 +335,24 @@ Heads
 Heads
 ```
 
+### Binary mode
+Since v1.1.0 apg-go has a new algorithm for binary secrets. This is a very basic mode that will ignore
+most of the available options, as it will only generate binary secrets with full 256 bits of randomness.
+The only available options for this mode are: `-f` to set the length of the returned secret in bytes, 
+`-bh` to tell apg-go to output the generated secret in hexadecial representation and `-bn` to instruct
+apg-go to return a newline after the generated secret. Any other option available in the other modes
+will be ignored.
+
+This mode can be useful for example if you need to generate a AES-256 encryption key. Since 32 bytes is
+the default length for the secret generation in this mode, you can simply generate a secret key with 
+the following command:
+```shell
+$ apg -a 3 -bh
+a1cdab8db365af3d70828b1fe43b7896190c157ad3f1ae2a0a1d52ec1628c6b5
+```
+*For ease for readability we used the `-bh` flag, to instruct apg-go to output the secret in its
+hexadecimal representation*
+
 ### Minimum required characters
 Even though in apg-go you can select what kind of characters are used for the password generation, it is
 not guaranteed, that if you request a password with a numeric value, that the generated password will 
@@ -376,6 +402,9 @@ _apg-go_ replicates most of the parameters of the original c-apg. Some parameter
   - `0`: Pronouncable password generation (Koremutake syllables)
   - `1`: Random password generation according to password modes/flags
   - `2`: Coinflip (returns heads or tails)
+  - `3`: Binary mode (returns a secret with 256 bits of randomness)
+- `-bh`: When set, will print the generated secret in its hex representation (Default: off)
+- `-bn`: When set, will return a new line character after the generated secret (Default: off)
 - `-m <length>`: The minimum length of the password to be generated (Default: 12)
 - `-x <length>`: The maximum length of the password to be generated (Default: 20)
 - `-f <length>`: Fixed length of the password to be generated (Ignores -m and -x)

SECURITY.md

@@ -0,0 +1,38 @@
+<!--
+SPDX-FileCopyrightText: 2021-2024 Winni Neessen <wn@neessen.dev>
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+To report (possible) security issues in apg-go, please either send a mail to 
+[security@neessen.dev](mailto:security@neessen.dev) or use Github's 
+[private reporting feature](https://github.com/wneessen/apg-go/security/advisories/new).
+Reports are always welcome. Even if you are not 100% certain that a specific issue you found
+counts as a security issue, we'd love to hear the details, so we can figure out together if
+the issue in question needds to be addressed.
+
+Typically, you will receive an answer within a day or even within a few hours.
+
+## Encryption
+You can send OpenPGP/GPG encrpyted mails to the [security@neessen.dev](mailto:security@neessen.dev) address.
+
+OpenPGP/GPG public key:
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+xjMEZfdSjxYJKwYBBAHaRw8BAQdA8YoxV0iaLJxVUkBlpC+FQyOiCvWPcnnk
+O8rsfRHT22bNK3NlY3VyaXR5QG5lZXNzZW4uZGV2IDxzZWN1cml0eUBuZWVz
+c2VuLmRldj7CjAQQFgoAPgWCZfdSjwQLCQcICZAajWCli0ncDgMVCAoEFgAC
+AQIZAQKbAwIeARYhBB6X6h8oUi9vvjcMFxqNYKWLSdwOAACHrQEAmfT2HNXF
+x1W0z6E6PiuoHDU6DzZ1MC6TZkFfFoC3jJ0BAJZdZnf6xFkVtEAbxNIVpIkI
+zjVxgI7gefYDXbqzQx4PzjgEZfdSjxIKKwYBBAGXVQEFAQEHQBdOGYxMLrCy
++kypzTe9jgaEOjob2VVsZ2UV2K9MGKYYAwEIB8J4BBgWCgAqBYJl91KPCZAa
+jWCli0ncDgKbDBYhBB6X6h8oUi9vvjcMFxqNYKWLSdwOAABIFAEA3YglATpF
+YrJxatxHb+yI6WdhhJTA2TaF2bxBl10d/xEA/R5CKbMe3kj647gjiQ1YXQUh
+dM5AKh9kcJn6FPLEoKEM
+=nm5C
+-----END PGP PUBLIC KEY BLOCK-----
+```

algo.go

@@ -18,6 +18,9 @@ const (
 	// AlgoCoinFlip represents a very simple coinflip algorithm returning "heads"
 	// or "tails"
 	AlgoCoinFlip
+	// AlgoBinary represents a full binary randomness mode with up to 256 bits
+	// of randomness
+	AlgoBinary
 	// AlgoUnsupported represents an unsupported algorithm
 	AlgoUnsupported
 )
@@ -32,6 +35,8 @@ func IntToAlgo(a int) Algorithm {
 		return AlgoRandom
 	case 2:
 		return AlgoCoinFlip
+	case 3:
+		return AlgoBinary
 	default:
 		return AlgoUnsupported
 	}

algo_test.go

@@ -4,7 +4,9 @@
 
 package apg
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestIntToAlgo(t *testing.T) {
 	tt := []struct {
@@ -15,7 +17,8 @@ func TestIntToAlgo(t *testing.T) {
 		{"AlgoPronounceable", 0, AlgoPronounceable},
 		{"AlgoRandom", 1, AlgoRandom},
 		{"AlgoCoinflip", 2, AlgoCoinFlip},
-		{"AlgoUnsupported", 3, AlgoUnsupported},
+		{"AlgoBinary", 3, AlgoBinary},
+		{"AlgoUnsupported", 4, AlgoUnsupported},
 	}
 	for _, tc := range tt {
 		t.Run(tc.name, func(t *testing.T) {
@@ -26,3 +29,34 @@ func TestIntToAlgo(t *testing.T) {
 		})
 	}
 }
+
+func FuzzIntToAlgo(f *testing.F) {
+	f.Add(-1)  // Test negative input
+	f.Add(4)   // Test out-of-range positive input
+	f.Add(100) // Test very large input
+	f.Fuzz(func(t *testing.T, a int) {
+		algo := IntToAlgo(a)
+		switch a {
+		case 0:
+			if algo != AlgoPronounceable {
+				t.Errorf("IntToAlgo(%d) expected AlgoPronounceable, got %v", a, algo)
+			}
+		case 1:
+			if algo != AlgoRandom {
+				t.Errorf("IntToAlgo(%d) expected AlgoRandom, got %v", a, algo)
+			}
+		case 2:
+			if algo != AlgoCoinFlip {
+				t.Errorf("IntToAlgo(%d) expected AlgoCoinFlip, got %v", a, algo)
+			}
+		case 3:
+			if algo != AlgoBinary {
+				t.Errorf("IntToAlgo(%d) expected AlgoBinary, got %v", a, algo)
+			}
+		default:
+			if algo != AlgoUnsupported {
+				t.Errorf("IntToAlgo(%d) expected AlgoUnsupported, got %v", a, algo)
+			}
+		}
+	})
+}

apg.go

@@ -5,7 +5,7 @@
 package apg
 
 // VERSION represents the version string
-const VERSION = "1.0.0"
+const VERSION = "1.1.0"
 
 // Generator is the password generator type of the APG package
 type Generator struct {

cmd/apg/apg.go

@@ -31,6 +31,8 @@ func main() {
 	var modeString string
 	var complexPass, humanReadable, lowerCase, numeric, special, showVer, upperCase bool
 	flag.IntVar(&algorithm, "a", 1, "")
+	flag.BoolVar(&config.BinaryHexMode, "bh", false, "")
+	flag.BoolVar(&config.BinaryNewline, "bn", false, "")
 	flag.BoolVar(&complexPass, "C", false, "")
 	flag.StringVar(&config.ExcludeChars, "E", "", "")
 	flag.Int64Var(&config.FixedLength, "f", 0, "")
@@ -144,6 +146,23 @@ func configOldStyle(config *apg.Config, humanReadable, lowerCase, upperCase,
 
 func generate(config *apg.Config) {
 	generator := apg.New(config)
+
+	// In binary mode we only generate a single secret
+	if config.Algorithm == apg.AlgoBinary {
+		password, err := generator.Generate()
+		if err != nil {
+			_, _ = fmt.Fprintf(os.Stderr, "failed to generate password: %s\n", err)
+			os.Exit(1)
+		}
+		if config.BinaryNewline {
+			fmt.Println(password)
+			return
+		}
+		fmt.Print(password)
+		return
+	}
+
+	// For any other mode we cycle through the amount of passwords to be generated
 	for i := int64(0); i < config.NumberPass; i++ {
 		password, err := generator.Generate()
 		if err != nil {
@@ -197,12 +216,17 @@ Flags:
                           - 0: pronounceable password generation (koremutake syllables)
                           - 1: random password generation according to password modes/flags
                           - 2: coinflip (returns heads or tails)
+                          - 3: full binary mode (generates simple 256 bit randomness)
+    -bh                  When set, will print the generated secret in its hex representation (Default: off)
+    -bn                  When set, will return a new line character after the generated secret (Default: off)
+                          - Note: The -bX options only apply to binary mode (Algo: 3)
     -m LENGTH            Minimum length of the password to be generated (Default: 12)
     -x LENGTH            Maximum length of the password to be generated (Default: 20)
     -f LENGTH            Fixed length of the password to be generated (Ignores -m and -x)
                           - Note: Due to the way the pronounceable password algorithm works,
 	                        this setting might not always apply
     -n NUMBER            Amount of password to be generated (Default: 6)
+                          - Note: Does not apply to binary mode (Algo: 3)
     -E CHARS             List of characters to be excluded in the generated password
     -M [LUNSHClunshc]    New style password flags
                           - Note: new-style flags have higher priority than any of the old-style flags

config.go

@@ -10,6 +10,8 @@ const (
 	DefaultMinLength int64 = 12
 	// DefaultMaxLength reflects the default maximum length of a generated password
 	DefaultMaxLength int64 = 20
+	// DefaultBinarySize is the default byte size for generating binary random bytes
+	DefaultBinarySize int64 = 32
 	// DefaultMode sets the default character set mode bitmask to a combination of
 	// lower- and upper-case characters as well as numbers
 	DefaultMode ModeMask = ModeLowerCase | ModeNumeric | ModeUpperCase
@@ -21,6 +23,11 @@ const (
 type Config struct {
 	// Algorithm sets the Algorithm used for the password generation
 	Algorithm Algorithm
+	// BinaryHexMode if set will output the hex representation of the generated
+	// binary random string
+	BinaryHexMode bool
+	// BinaryNewline if set will print out a new line in AlgoBinary mode
+	BinaryNewline bool
 	// CheckHIBP sets a flag if the generated password has to be checked
 	// against the HIBP pwned password database
 	CheckHIBP bool
@@ -88,6 +95,13 @@ func WithAlgorithm(algo Algorithm) Option {
 	}
 }
 
+// WithBinaryHexMode sets the hex mode for the AlgoBinary
+func WithBinaryHexMode() Option {
+	return func(config *Config) {
+		config.BinaryHexMode = true
+	}
+}
+
 // WithExcludeChars sets a list of characters to be excluded in the generated
 // passwords
 func WithExcludeChars(chars string) Option {

config_test.go

@@ -46,7 +46,8 @@ func TestWithAlgorithm(t *testing.T) {
 		{"Pronounceable passwords", AlgoPronounceable, 0},
 		{"Random passwords", AlgoRandom, 1},
 		{"Coinflip", AlgoCoinFlip, 2},
-		{"Unsupported", AlgoUnsupported, 3},
+		{"Binary", AlgoBinary, 3},
+		{"Unsupported", AlgoUnsupported, 4},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -67,6 +68,18 @@ func TestWithAlgorithm(t *testing.T) {
 	}
 }
 
+func TestWithBinaryHexMode(t *testing.T) {
+	c := NewConfig(WithBinaryHexMode())
+	if c == nil {
+		t.Errorf("NewConfig(WithBinaryHexMode()) failed, expected config pointer but got nil")
+		return
+	}
+	if !c.BinaryHexMode {
+		t.Errorf("NewConfig(WithBinaryHexMode()) failed, expected chars: %t, got: %t",
+			true, c.BinaryHexMode)
+	}
+}
+
 func TestWithExcludeChars(t *testing.T) {
 	e := "abcdefg"
 	c := NewConfig(WithExcludeChars(e))
@@ -183,3 +196,18 @@ func TestWithModeMask(t *testing.T) {
 			e, c.Mode)
 	}
 }
+
+func FuzzWithAlgorithm(f *testing.F) {
+	f.Add(0)
+	f.Add(1)
+	f.Add(2)
+	f.Add(3)
+	f.Add(-1)
+	f.Add(100)
+	f.Fuzz(func(t *testing.T, algo int) {
+		config := NewConfig(WithAlgorithm(Algorithm(algo)))
+		if config.MaxLength < config.MinLength {
+			t.Errorf("Invalid algorithm: %d", algo)
+		}
+	})
+}

hibp_test.go

@@ -21,7 +21,8 @@ func TestHasBeenPwned(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			got, err := HasBeenPwned(tt.password)
 			if err != nil {
-				t.Errorf("HasBeenPwned() failed: %s", err)
+				t.Logf("HasBeenPwned() failed: %s", err)
+				return
 			}
 			if tt.want != got {
 				t.Errorf("HasBeenPwned() failed, wanted: %t, got: %t", tt.want, got)

random.go

@@ -57,10 +57,13 @@ func (g *Generator) Generate() (string, error) {
 		return g.generateCoinFlip()
 	case AlgoRandom:
 		return g.generateRandom()
+	case AlgoBinary:
+		return g.generateBinary()
 	case AlgoUnsupported:
 		return "", fmt.Errorf("unsupported algorithm")
+	default:
+		return "", fmt.Errorf("unsupported algorithm")
 	}
-	return "", nil
 }
 
 // GetCharRangeFromConfig checks the Mode from the Config and returns a
@@ -315,8 +318,26 @@ func (g *Generator) generatePronounceable() (string, error) {
 	return password, nil
 }
 
+// generateBinary is executed when Generate() is called with Algorithm set
+// to AlgoBinary
+func (g *Generator) generateBinary() (string, error) {
+	length := DefaultBinarySize
+	if g.config.FixedLength > 0 {
+		length = g.config.FixedLength
+	}
+	randBytes := make([]byte, length)
+	_, err := rand.Read(randBytes)
+	if err != nil {
+		return "", fmt.Errorf("failed to generate random bytes: %w", err)
+	}
+	if g.config.BinaryHexMode {
+		return fmt.Sprintf("%x", randBytes), nil
+	}
+	return string(randBytes), nil
+}
+
 // generateRandom is executed when Generate() is called with Algorithm set
-// to AlgoRandmom
+// to AlgoRandom
 func (g *Generator) generateRandom() (string, error) {
 	length, err := g.GetPasswordLength()
 	if err != nil {

random_test.go

@@ -471,6 +471,10 @@ func TestGenerate(t *testing.T) {
 			name:      "Random",
 			algorithm: AlgoRandom,
 		},
+		{
+			name:      "Binary",
+			algorithm: AlgoBinary,
+		},
 		{
 			name:        "Unsupported",
 			algorithm:   AlgoUnsupported,
@@ -530,3 +534,38 @@ func BenchmarkGenerator_RandomString(b *testing.B) {
 		}
 	}
 }
+
+func TestGenerator_generateBinary(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr bool
+	}{
+		{
+			name:    "Positive Case - Binary in Hex",
+			config:  &Config{FixedLength: 10, BinaryHexMode: true},
+			wantErr: false,
+		},
+		{
+			name:    "Negative Case - Insufficient length",
+			config:  &Config{FixedLength: -1, BinaryHexMode: false},
+			wantErr: false,
+		},
+		{
+			name:    "Positive Case - Binary without Hex",
+			config:  &Config{FixedLength: 10, BinaryHexMode: false},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			g := &Generator{config: tt.config}
+			_, err := g.generateBinary()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Generator.generateBinary() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+		})
+	}
+}

spelling_test.go

@@ -140,6 +140,12 @@ func TestPronounce(t *testing.T) {
 			want:      "mu-sa",
 			wantErr:   false,
 		},
+		{
+			name:      "Pronounce_Mixed",
+			syllables: []string{"mu", "1"},
+			want:      "mu-ONE",
+			wantErr:   false,
+		},
 		{
 			name:      "Pronounce_NonKoremutakeSyllable",
 			syllables: []string{"ä"},