chore(pkg/csv2lp): improve Test_CsvToLineProtocol_RowSkipped

pkg/csv2lp/csv2lp_test.go

@@ -204,38 +204,66 @@ func Test_CsvToLineProtocol_SkipRowOnError(t *testing.T) {
 	require.Equal(t, messages, 2)
 }
 
-// Test_CsvToLineProtocol_RowSkipped tests that error rows are reported to configured RowSkippedListener
+// Test_CsvToLineProtocol_RowSkipped tests that error rows are reported to configured RowSkipped listener
 func Test_CsvToLineProtocol_RowSkipped(t *testing.T) {
 	var buf bytes.Buffer
 	log.SetOutput(&buf)
 	oldFlags := log.Flags()
 	log.SetFlags(0)
-	oldPrefix := log.Prefix()
-	prefix := "::PREFIX::"
-	log.SetPrefix(prefix)
 	defer func() {
 		log.SetOutput(os.Stderr)
 		log.SetFlags(oldFlags)
-		log.SetPrefix(oldPrefix)
 	}()
 
+	type ActualArguments = struct {
+		src *CsvToLineReader
+		err error
+		row []string
+	}
+	type ExpectedArguments = struct {
+		errorString string
+		row         []string
+	}
+
 	csv := "sep=;\n_measurement;a|long:strict\n;1\ncpu;2.1\ncpu;3a\n"
+	calledArgs := []ActualArguments{}
+	expectedArgs := []ExpectedArguments{
+		{
+			"line 3: column '_measurement': no measurement supplied",
+			[]string{"", "1"},
+		},
+		{
+			"line 4: column 'a': '2.1' cannot fit into long data type",
+			[]string{"cpu", "2.1"},
+		},
+		{
+			"line 5: column 'a': strconv.ParseInt:",
+			[]string{"cpu", "3a"},
+		},
+	}
 
 	reader := CsvToLineProtocol(strings.NewReader(csv)).SkipRowOnError(true)
 	reader.RowSkipped = func(src *CsvToLineReader, err error, _row []string) {
-		log.Println(err, string(src.Comma()))
+		// make a copy of _row
+		row := make([]string, len(_row))
+		copy(row, _row)
+		// remember for comparison
+		calledArgs = append(calledArgs, ActualArguments{
+			src, err, row,
+		})
 	}
 	// read all the data
 	ioutil.ReadAll(reader)
 
 	out := buf.String()
-	// fmt.Println(out, string(';'))
-	// ::PREFIX::line 3: column '_measurement': no measurement supplied
-	// ::PREFIX::line 4: column 'a': '2.1' cannot fit into long data type
-	// ::PREFIX::line 5: column 'a': strconv.ParseInt: parsing "3a": invalid syntax
-	messages := strings.Count(out, prefix)
-	require.Equal(t, 3, messages)
-	require.Equal(t, 3, strings.Count(out, ";"))
+	require.Empty(t, out, "No log messages expected because RowSkipped handler is set")
+
+	require.Len(t, calledArgs, 3)
+	for i, expected := range expectedArgs {
+		require.Equal(t, reader, calledArgs[i].src)
+		require.Contains(t, calledArgs[i].err.Error(), expected.errorString)
+		require.Equal(t, expected.row, calledArgs[i].row)
+	}
 }
 
 // Test_CsvLineError tests CsvLineError error format