Started working on unit tests

Fixed some bugs in the CSVColumn processor

csv.go

@@ -9,6 +9,7 @@ import (
 func CSVColumn(name string) func(r io.Reader, w io.Writer) error {
 	return func(r io.Reader, w io.Writer) error {
 		cr := csv.NewReader(r)
+		cr.FieldsPerRecord = -1
 
 		header, err := cr.Read()
 		if err != nil {
@@ -34,7 +35,7 @@ func CSVColumn(name string) func(r io.Reader, w io.Writer) error {
 					return err
 				}
 			}
-			if len(rec) < colIdx {
+			if len(rec) <= colIdx {
 				continue
 			}
 

csv_test.go

@@ -0,0 +1,31 @@
+package scriptx_test
+
+import (
+	"testing"
+
+	"github.com/bitfield/script"
+	"github.com/lmika/scriptx"
+)
+
+func TestCSVColumn(t *testing.T) {
+	t.Run("should return named column of CSV input", func(t *testing.T) {
+		verifyPipeLines(t, func(p *script.Pipe) *script.Pipe {
+			return p.Filter(scriptx.CSVColumn("state"))
+		}, []string{
+			"city,state,country",
+			"Melbourne,Vic,AU",
+			"Sydney,NSW,AU",
+			"Canberra,\"Territory, Australian Capital\",AU",
+			"New York,NY,US,Extra,Comments,Allowed",
+			"Missing state is ignored",
+			"# Comment is ignored",
+			"Seattle,WA",
+		}, []string{
+			"Vic",
+			"NSW",
+			"Territory, Australian Capital",
+			"NY",
+			"WA",
+		})
+	})
+}

fmt_test.go

@@ -1,7 +1,40 @@
 package scriptx_test
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/bitfield/script"
+	"github.com/lmika/scriptx"
+	"github.com/stretchr/testify/assert"
+)
 
 func TestPrintf(t *testing.T) {
-	t.Log("Hello")
+	t.Run("should format each line according to the pattern", func(t *testing.T) {
+		verifyPipeLines(t, func(p *script.Pipe) *script.Pipe {
+			return p.Filter(scriptx.Printf("Line: [%v]"))
+		}, []string{
+			"Line 1",
+			"Line 2",
+			"Line 3",
+		}, []string{
+			"Line: [Line 1]",
+			"Line: [Line 2]",
+			"Line: [Line 3]",
+		})
+	})
+}
+
+func verifyPipeLines(t *testing.T, fn func(p *script.Pipe) *script.Pipe, inLines []string, expOut []string) {
+	pipe := script.Slice(inLines)
+	outLines, err := fn(pipe).Slice()
+
+	assert.NoError(t, err)
+	assert.Equal(t, expOut, outLines)
+}
+
+func verifyPipeErr(t *testing.T, fn func(p *script.Pipe) *script.Pipe, inLines []string) {
+	pipe := script.Slice(inLines)
+	_, err := fn(pipe).Slice()
+
+	assert.Error(t, err)
 }