Challenge 2 — Solution

Task: Rewrite Challenge 1's test as a table-driven test: a slice of
struct { input int; want bool } with at least 5 cases, looped over
with a single shared assertion.

package main

import "testing"

func TestIsEven(t *testing.T) {
	tests := []struct {
		input int
		want  bool
	}{
		{4, true},
		{7, false},
		{0, true},
		{-2, true},
		{-3, false},
	}

	for _, tt := range tests {
		result := IsEven(tt.input)
		if result != tt.want {
			t.Errorf("IsEven(%d) = %v; want %v", tt.input, result, tt.want)
		}
	}
}


Expected result of running "go test -v":

=== RUN   TestIsEven
--- PASS: TestIsEven (0.00s)
PASS

Notes:
- Negative numbers are included to confirm IsEven also works
  correctly below zero — -2 % 2 in Go is 0, so it's correctly
  treated as even.
- Adding a 6th test case later is just one more line inside the
  tests slice — no new function or duplicated assertion logic is
  needed.
- This is the same struct + range pattern used for ordinary data
  throughout the course (Intermediate Chapter 1, Fundamentals
  Chapter 6), just applied here specifically to test inputs.