New test file for specific code section or data type

common-errors.go

@@ -8,32 +8,40 @@ import (
 	"fmt"
 )
 
-func errTooFewParams(minArgs, maxArgs, argCount int) (err error) {
+func errTooFewParams(funcName string, minArgs, maxArgs, argCount int) (err error) {
 	if maxArgs < 0 {
-		err = fmt.Errorf("too few params -- expected %d or more, got %d", minArgs, argCount)
+		err = fmt.Errorf("%s(): too few params -- expected %d or more, got %d", funcName, minArgs, argCount)
 	} else {
-		err = fmt.Errorf("too few params -- expected %d, got %d", minArgs, argCount)
+		err = fmt.Errorf("%s(): too few params -- expected %d, got %d", funcName, minArgs, argCount)
 	}
 	return
 }
 
-func errTooMuchParams(maxArgs, argCount int) (err error) {
-	err = fmt.Errorf("too much params -- expected %d, got %d", maxArgs, argCount)
+func errTooMuchParams(funcName string, maxArgs, argCount int) (err error) {
+	err = fmt.Errorf("%s(): too much params -- expected %d, got %d", funcName, maxArgs, argCount)
 	return
 }
 
 // --- General errors
 
 func errCantConvert(funcName string, value any, kind string) error {
-	return fmt.Errorf("%s() can't convert %T to %s", funcName, value, kind)
+	if typer, ok := value.(Typer); ok {
+		return fmt.Errorf("%s(): can't convert %s to %s", funcName, typer.TypeName(), kind)
+	} else {
+		return fmt.Errorf("%s(): can't convert %T to %s", funcName, value, kind)
+	}
 }
 
 func errExpectedGot(funcName string, kind string, value any) error {
 	return fmt.Errorf("%s() expected %s, got %T (%v)", funcName, kind, value, value)
 }
 
-func errDivisionByZero(funcName string) error {
-	return fmt.Errorf("%s() division by zero", funcName)
+func errFuncDivisionByZero(funcName string) error {
+	return fmt.Errorf("%s(): division by zero", funcName)
+}
+
+func errDivisionByZero() error {
+	return fmt.Errorf("division by zero")
 }
 
 // --- Parameter errors