✨ Implement core waiterr package with initial functionality and tests.

waiterr_test.go

@@ -0,0 +1,66 @@
+package waiterr_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/nalgeon/be"
+
+	"codeberg.org/danjones000/waiterr"
+)
+
+func TestGo(t *testing.T) {
+	we := new(waiterr.WaitErr)
+	err := errors.New("uh-oh")
+	var run bool
+	we.Go(func() error {
+		run = true
+		return err
+	})
+
+	be.Err(t, we.Wait(), err)
+	be.True(t, run)
+}
+
+func TestWait(t *testing.T) {
+	we := new(waiterr.WaitErr)
+	er1 := errors.New("uh-oh")
+	er2 := errors.New("oops")
+	we.Go(func() error { return er1 })
+	we.Go(func() error { return nil })
+	we.Go(func() error { return er2 })
+
+	err := we.Wait()
+	be.Err(t, err, er1, er2)
+	if ers, ok := err.(interface{ Unwrap() []error }); ok {
+		all := ers.Unwrap()
+		be.Equal(t, len(all), 2)
+		be.True(t, all[0] == er1 || all[0] == er2)
+		be.True(t, all[1] == er2 || all[1] == er1)
+	} else {
+		t.Fatal("Returned error should have Unwrap method")
+	}
+}
+
+func TestWaitForError(t *testing.T) {
+	we := new(waiterr.WaitErr)
+	er1 := errors.New("uh-oh")
+	er2 := errors.New("oops")
+	we.Go(func() error { return nil })
+	we.Go(func() error { return er1 })
+	we.Go(func() error { return er2 })
+
+	err := we.WaitForError()
+	// Due to how goroutines run, it is possible that either of those return first. This is an acceptable limitation
+	be.True(t, err == er1 || err == er2)
+}
+
+func TestWaitForErrorNoErr(t *testing.T) {
+	we := new(waiterr.WaitErr)
+	we.Go(func() error { return nil })
+	we.Go(func() error { return nil })
+	we.Go(func() error { return nil })
+
+	err := we.WaitForError()
+	be.Err(t, err, nil)
+}