Implement guess check

lib/lib.go

@@ -0,0 +1,11 @@
+package lib
+
+func CheckGuess(guess, random int) (string, bool) {
+	if guess == random {
+		return "Good job!", true
+	}
+	if random > guess {
+		return "Try higher.", false
+	}
+	return "Nope, lower.", false
+}

lib/lib_test.go

@@ -0,0 +1,50 @@
+package lib
+
+import (
+	"testing"
+)
+
+/*
+Requirements:
+The app selects a random number between 1 and 100
+The app then asks the player to guess the number.
+If the guess is correct, then the player wins. The app displays
+the number of guesses it took and exits.
+If the guess is incorrect, the app prints whether the selected number
+is higher or lower than the guess.
+Then, the app prompts the player again, etc.
+*/
+
+func TestCheckGuess(t *testing.T) {
+	t.Run("guess is lower than random", func(t *testing.T) {
+		random := 63
+		guess := 50
+		wantStatus := "Try higher."
+
+		assertCheckGuess(t, guess, random, wantStatus, false)
+	})
+	t.Run("guess is higher than random", func(t *testing.T) {
+		random := 34
+		guess := 50
+		wantStatus := "Nope, lower."
+
+		assertCheckGuess(t, guess, random, wantStatus, false)
+	})
+	t.Run("guess is equal to random", func(t *testing.T) {
+		random := 50
+		guess := 50
+		wantStatus := "Good job!"
+
+		assertCheckGuess(t, guess, random, wantStatus, true)
+	})
+}
+
+func assertCheckGuess(t *testing.T, guess, random int, wantStatus string, wantWon bool) {
+	status, won := CheckGuess(guess, random)
+	if status != wantStatus {
+		t.Errorf("got %q want %q", status, wantStatus)
+	}
+	if won != wantWon {
+		t.Errorf("got %v want %v", won, wantWon)
+	}
+}