diff --git a/expr_test.go b/expr_test.go
index e1d0885..58c1a14 100644
--- a/expr_test.go
+++ b/expr_test.go
@@ -5,7 +5,6 @@
 package expr
 
 import (
-	"fmt"
 	"strings"
 	"testing"
 )
@@ -53,7 +52,7 @@ func TestExpr(t *testing.T) {
 		ImportOsFuncs(ctx)
 		parser := NewParser(ctx)
 
-		logTest(t, i+1, input.source, input.wantResult, input.wantErr)
+		logTest(t, i+1, "Expr", input.source, input.wantResult, input.wantErr)
 
 		r := strings.NewReader(input.source)
 		scanner := NewScanner(r, DefaultTranslations())
@@ -81,5 +80,5 @@ func TestExpr(t *testing.T) {
 			failed++
 		}
 	}
-	t.Log(fmt.Sprintf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed))
+	t.Logf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed)
 }
diff --git a/funcs_test.go b/funcs_test.go
index 8c92233..eede78d 100644
--- a/funcs_test.go
+++ b/funcs_test.go
@@ -6,7 +6,6 @@ package expr
 
 import (
 	"errors"
-	"fmt"
 	"strings"
 	"testing"
 )
@@ -50,7 +49,7 @@ func TestFuncs(t *testing.T) {
 		// ImportOsFuncs(ctx)
 		parser := NewParser(ctx)
 
-		logTest(t, i+1, input.source, input.wantResult, input.wantErr)
+		logTest(t, i+1, "Funcs", input.source, input.wantResult, input.wantErr)
 
 		r := strings.NewReader(input.source)
 		scanner := NewScanner(r, DefaultTranslations())
@@ -78,5 +77,5 @@ func TestFuncs(t *testing.T) {
 			failed++
 		}
 	}
-	t.Log(fmt.Sprintf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed))
+	t.Logf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed)
 }
diff --git a/parser_test.go b/parser_test.go
index 8ba0505..e587338 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -6,7 +6,6 @@ package expr
 
 import (
 	"errors"
-	"fmt"
 	"reflect"
 	"strings"
 	"testing"
@@ -205,7 +204,7 @@ func TestParser(t *testing.T) {
 		ImportImportFuncs(ctx)
 		parser := NewParser(ctx)
 
-		logTest(t, i+1, input.source, input.wantResult, input.wantErr)
+		logTest(t, i+1, "General", input.source, input.wantResult, input.wantErr)
 
 		r := strings.NewReader(input.source)
 		scanner := NewScanner(r, DefaultTranslations())
@@ -238,7 +237,7 @@ func TestParser(t *testing.T) {
 			}
 		}
 	}
-	t.Log(fmt.Sprintf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed))
+	t.Logf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed)
 }
 
 func TestListParser(t *testing.T) {
@@ -258,8 +257,9 @@ func TestListParser(t *testing.T) {
 		/*  7 */ {`add([1,4,3,2])`, int64(10), nil},
 		/*  8 */ {`add([1,[2,2],3,2])`, int64(10), nil},
 		/*  9 */ {`mul([1,4,3.0,2])`, float64(24.0), nil},
-		/* 10 */ {`add([1,"hello"])`, nil, errors.New(`add(): param nr 2 has wrong type string, number expected`)},
+		/* 10 */ {`add([1,"hello"])`, nil, errors.New(`add(): param nr 2 (2 in 1) has wrong type string, number expected`)},
 		/* 11 */ {`[a=1,b=2,c=3] but a+b+c`, int64(6), nil},
+
 		// /*  8 */ {`[int(x)|x=csv("test.csv",1,all(),1)]`, []any{int64(10), int64(40), int64(20)}, nil},
 		// /*  9 */ {`sum(@[int(x)|x=csv("test.csv",1,all(),1)])`, []any{int64(10), int64(40), int64(20)}, nil},
 	}
@@ -282,7 +282,7 @@ func TestListParser(t *testing.T) {
 		ImportMathFuncs(ctx)
 		parser := NewParser(ctx)
 
-		logTest(t, i+1, input.source, input.wantResult, input.wantErr)
+		logTest(t, i+1, "List", input.source, input.wantResult, input.wantErr)
 
 		r := strings.NewReader(input.source)
 		scanner := NewScanner(r, DefaultTranslations())
@@ -334,13 +334,13 @@ func TestListParser(t *testing.T) {
 			failed++
 		}
 	}
-	t.Log(fmt.Sprintf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed))
+	t.Logf("test count: %d, succeeded count: %d, failed count: %d", len(inputs), succeeded, failed)
 }
 
-func logTest(t *testing.T, n int, source string, wantResult any, wantErr error) {
+func logTest(t *testing.T, n int, section, source string, wantResult any, wantErr error) {
 	if wantErr == nil {
-		t.Log(fmt.Sprintf("[+]Test nr %3d -- %q  --> %v", n, source, wantResult))
+		t.Logf("[+]%s nr %3d -- %q  --> %v", section, n, source, wantResult)
 	} else {
-		t.Log(fmt.Sprintf("[-]Test nr %3d -- %q  --> %v", n, source, wantErr))
+		t.Logf("[-]%s nr %3d -- %q  --> %v", section, n, source, wantErr)
 	}
 }