$ goinstall github.com/bmizerany/assert
point.go
package point
type Point struct {
    x, y int
}
point_test.go
package point
import (
    "testing"
    "github.com/bmizerany/assert"
)
func TestAsserts(t *testing.T) {
    p1 := Point{1, 1}
    p2 := Point{2, 1}
    assert.Equal(t, p1, p2)
}
output
--- FAIL: point.TestAsserts
        /Users/blake/code/assert/example/point_test.go:12
        !  Expected: point.Point point.Point{x:1, y:1}
        !  Got:      point.Point point.Point{x:2, y:1}
FAIL
http://github.com/bmizerany/assert