Add tests for token generation

internal/authentication/token_test.go

@@ -0,0 +1,48 @@
+package authentication
+
+import (
+	"log"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func isGoodToken(assert *assert.Assertions, require *require.Assertions, token string, compat bool) {
+	prefix := token[0:len(applicationTokenPrefix)]
+	token = token[len(applicationTokenPrefix):]
+
+	// Although constant at the time of writing, this check should prevent future changes from generating insecure tokens.
+	if len(token) < 14 {
+		log.Fatalf("Tokens should have more random characters")
+	}
+
+	if compat {
+		assert.Equal(len(token), compatTokenLength, "Unexpected compatibility token length")
+	} else {
+		assert.Equal(len(token), regularTokenLength, "Unexpected regular token length")
+	}
+
+	assert.Equal(prefix, applicationTokenPrefix, "Invalid token prefix")
+
+	for _, c := range []byte(token) {
+		assert.Contains(tokenCharacters, c, "Unexpected character in token")
+	}
+}
+
+func TestAuthentication_GenerateApplicationToken(t *testing.T) {
+	assert := assert.New(t)
+	require := require.New(t)
+
+	for i := 0; i < 64; i++ {
+		token := GenerateApplicationToken(false)
+
+		isGoodToken(assert, require, token, false)
+	}
+
+	for i := 0; i < 64; i++ {
+		token := GenerateApplicationToken(true)
+
+		isGoodToken(assert, require, token, true)
+	}
+}