Implement a first working version of the game

lib.go

@@ -1,5 +1,12 @@
 package main
 
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strconv"
+)
+
 func CheckGuess(guess, random int) (string, bool) {
 	if guess == random {
 		return "Good job!", true
@@ -9,3 +16,24 @@ func CheckGuess(guess, random int) (string, bool) {
 	}
 	return "Nope, lower.", false
 }
+
+func LoopUntilFound(writer io.Writer, reader io.Reader, random int) {
+	scanner := bufio.NewScanner(reader)
+	win := false
+	count := 0
+	for !win {
+		fmt.Fprint(writer, "your guess: ")
+		scanner.Scan()
+		value := scanner.Text()
+		guess, _ := strconv.Atoi(value)
+		var msg string
+		msg, win = CheckGuess(guess, random)
+		fmt.Fprintf(writer, "\n%v\n", msg)
+		count++
+	}
+	if count == 1 {
+		fmt.Fprintln(writer, "You got it right in 1 try.")
+	} else {
+		fmt.Fprintf(writer, "You got it right in %d tries.\n", count)
+	}
+}

lib_test.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"bytes"
+	"strings"
 	"testing"
 )
 
@@ -49,3 +51,58 @@ func assertCheckGuess(t testing.TB, guess, random int, wantStatus string, wantWo
 		t.Errorf("got %v want %v", won, wantWon)
 	}
 }
+
+func TestLoopUntilFound(t *testing.T) {
+	t.Run("found on first try", func(t *testing.T) {
+		output := bytes.Buffer{}
+		input := strings.NewReader("37\n")
+		random := 37
+		LoopUntilFound(&output, input, random)
+
+		got := output.String()
+		want := "your guess: \nGood job!\nYou got it right in 1 try.\n"
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	})
+	t.Run("found on second try", func(t *testing.T) {
+		output := bytes.Buffer{}
+		input := strings.NewReader("50\n37\n")
+		random := 37
+		LoopUntilFound(&output, input, random)
+
+		got := output.String()
+		want := "your guess: \nNope, lower.\nyour guess: \nGood job!\nYou got it right in 2 tries.\n"
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	})
+	t.Run("found after many tries", func(t *testing.T) {
+		output := bytes.Buffer{}
+		inputs := []string{"50", "25", "32", "37", ""}
+		input := strings.NewReader(strings.Join(inputs, "\n"))
+		random := 37
+		LoopUntilFound(&output, input, random)
+
+		got := output.String()
+		wants := []string{
+			"your guess: ",
+			"Nope, lower.",
+			"your guess: ",
+			"Try higher.",
+			"your guess: ",
+			"Try higher.",
+			"your guess: ",
+			"Good job!",
+			"You got it right in 4 tries.",
+			"",
+		}
+		want := strings.Join(wants, "\n")
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	})
+}

main.go

@@ -1 +1,11 @@
 package main
+
+import (
+	"math/rand"
+	"os"
+)
+
+func main() {
+	random := rand.Intn(100)
+	LoopUntilFound(os.Stdout, os.Stdin, random)
+}