Add tests to jsontable.

- Test major functionality of jsontable
- Fix bug discovered in testing.

pkg/jsontable/jsontable.go

@@ -109,7 +109,7 @@ func (t *JSONTable) _JSONRenderInner() {
 		writeChar(t.out, '{')
 		for keyidx, key := range t.keys {
 			value := "nil"
-			if keyidx <= len(row) {
+			if keyidx < len(row) {
 				value = row[keyidx]
 			}
 			if keyidx != 0 {

pkg/jsontable/jsontable_test.go

@@ -0,0 +1,85 @@
+package jsontable
+
+import (
+	"testing"
+
+	"bytes"
+	"encoding/json"
+
+	"github.com/olekukonko/tablewriter"
+)
+
+
+var TestLine = []string{"1", "2"}
+var TestGroup = [][]string {{"1", "2", "3"}, {"a", "teohunteohu", "c", "d"}, {"☺", "☹"}}
+var TestKeys = []string{"key0", "key1", "key2"}
+
+/// test creation
+func TestNewTable(t *testing.T) {
+	var b bytes.Buffer
+	tbl := NewJSONTable(&b)
+	if tbl.NumLines() != 0 {
+		t.Fatalf("Something went weird when making table (should have 0 lines)")
+	}
+}
+
+/// test adding things
+func TestTableAdd(t *testing.T) {
+	var b bytes.Buffer
+	tbl := NewJSONTable(&b)
+
+	tbl.Append(TestLine)
+	if tbl.NumLines() != 1 {
+		t.Fatalf("Appending a line does not result in a length of 1.")
+	}
+
+	tbl.AppendBulk(TestGroup)
+	numlines := tbl.NumLines()
+	if numlines != (len(TestGroup) + 1) {
+		t.Fatalf("Appending two lines does not result in a length of 4 (length is %d).", numlines)
+	}
+}
+
+/// test JSON output is parsable
+func TestJsonParsable(t *testing.T) {
+	var b bytes.Buffer
+	tbl := NewJSONTable(&b)
+
+	tbl.AppendBulk(TestGroup)
+	tbl.SetHeader(TestKeys)
+
+	tbl.JSONRender()
+
+	var son []map[string]interface{}
+
+	err := json.Unmarshal(b.Bytes(), &son)
+
+	if err != nil {
+		t.Fatalf("Did not produce parsable JSON: %s", err.Error())
+	}
+}
+
+/// test identical commands to a tablewriter and jsontable produce the same rendered output
+func TestTableWriter(t *testing.T) {
+	var bjson bytes.Buffer
+	var btable bytes.Buffer
+
+	tbl := NewJSONTable(&bjson)
+
+	tbl.AppendBulk(TestGroup)
+	tbl.SetHeader(TestKeys)
+	tbl.Render()
+
+	wtbl := tablewriter.NewWriter(&btable)
+
+	wtbl.AppendBulk(TestGroup)
+	wtbl.SetHeader(TestKeys)
+	wtbl.Render()
+
+	if bytes.Compare(bjson.Bytes(), btable.Bytes()) != 0 {
+		t.Fatalf("JSON table and TableWriter produce non-identical outputs.\n%s\n%s", bjson.Bytes(), btable.Bytes())
+	}
+}
+
+
+/// FIXME test different output formats when captions etc. are added