Solution with unit tests (#51)

Author: abdul-manaan

students/abdul/problem.csv

@@ -0,0 +1,13 @@
+5+5,10
+7+3,10
+1+1,2
+8+3,11
+1+2,3
+8+6,14
+3+1,4
+1+4,5
+5+1,6
+2+3,5
+3+3,6
+2+4,6
+5+2,7

students/abdul/quiz.go

@@ -0,0 +1,131 @@
+package quiz
+
+import (
+	"bufio"
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"time"
+)
+
+//Number of Questions to ask
+const totalQuestions = 5
+
+//Question struct that stores question with answer
+type Question struct {
+	question string
+	answer   string
+}
+
+func main() {
+	filename, timeLimit := readArguments()
+	f, err := openFile(filename)
+	if err != nil {
+		return
+	}
+	questions, err := readCSV(f)
+
+	if err != nil {
+		// err := fmt.Errorf("Error in Reading Questions")
+		fmt.Println(err.Error())
+		return
+	}
+
+	if questions == nil {
+		return
+	}
+	score, err := askQuestion(questions, timeLimit)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("Your Score %d/%d\n", score, totalQuestions)
+}
+
+func readArguments() (string, int) {
+	filename := flag.String("filename", "problem.csv", "CSV File that conatins quiz questions")
+	timeLimit := flag.Int("limit", 30, "Time Limit for each question")
+	flag.Parse()
+	return *filename, *timeLimit
+}
+
+func readCSV(f io.Reader) ([]Question, error) {
+	// defer f.Close() // this needs to be after the err check
+	allQuestions, err := csv.NewReader(f).ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	numOfQues := len(allQuestions)
+	if numOfQues == 0 {
+		return nil, fmt.Errorf("No Question in file")
+	}
+
+	var data []Question
+	for _, line := range allQuestions {
+		ques := Question{}
+		ques.question = line[0]
+		ques.answer = line[1]
+		data = append(data, ques)
+	}
+
+	return data, nil
+}
+
+func openFile(filename string) (io.Reader, error) {
+	return os.Open(filename)
+}
+func getInput(input chan string) {
+	for {
+		in := bufio.NewReader(os.Stdin)
+		result, err := in.ReadString('\n')
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		input <- result
+	}
+}
+
+func askQuestion(questions []Question, timeLimit int) (int, error) {
+	totalScore := 0
+	timer := time.NewTimer(time.Duration(timeLimit) * time.Second)
+	done := make(chan string)
+
+	go getInput(done)
+
+	for i := range [totalQuestions]int{} {
+		ans, err := eachQuestion(questions[i].question, questions[i].answer, timer.C, done)
+		if err != nil && ans == -1 {
+			return totalScore, nil
+		}
+		totalScore += ans
+
+	}
+	return totalScore, nil
+}
+
+func eachQuestion(Quest string, answer string, timer <-chan time.Time, done <-chan string) (int, error) {
+	fmt.Printf("%s: ", Quest)
+
+	for {
+		select {
+		case <-timer:
+			return -1, fmt.Errorf("Time out")
+		case ans := <-done:
+			score := 0
+			if strings.Compare(strings.Trim(strings.ToLower(ans), "\n"), answer) == 0 {
+				score = 1
+			} else {
+				return 0, fmt.Errorf("Wrong Answer")
+			}
+
+			return score, nil
+		}
+	}
+}

students/abdul/quiz_test.go

@@ -0,0 +1,59 @@
+package quiz
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"gotest.tools/assert"
+)
+
+func testEachQuestion(t *testing.T) {
+	timer := time.NewTimer(time.Duration(2) * time.Second).C
+	done := make(chan string)
+	var quest Question
+	quest.question = "1+1"
+	quest.answer = "2"
+	var ans int
+	var err error
+	allDone := make(chan bool)
+	go func() {
+		ans, err = eachQuestion(quest.question, quest.answer, timer, done)
+		allDone <- true
+	}()
+	done <- "2"
+
+	<-allDone
+	if err != nil {
+		t.Error(err)
+	}
+	assert.Equal(t, ans, 1)
+}
+
+func testReadCSV(t *testing.T) {
+	str := "1+1,2\n2+1,3\n9+9,18\n"
+	quest, err := readCSV(strings.NewReader(str))
+	if err != nil {
+		t.Error(err)
+	}
+	var que [3]Question
+	que[0].answer = "2"
+	que[1].answer = "3"
+	que[2].answer = "18"
+	que[0].question = "1+1"
+	que[1].question = "2+1"
+	que[2].question = "9+9"
+
+	assert.Equal(t, que[0], quest[0])
+	assert.Equal(t, que[1], quest[1])
+	assert.Equal(t, que[2], quest[2])
+
+}
+
+func TestEachQuestion(t *testing.T) {
+	t.Run("test eachQuestion", testEachQuestion)
+}
+
+func TestReadCSV(t *testing.T) {
+	t.Run("test ReadCSV", testReadCSV)
+}