Merge pull request #936 from devlights/add-testing-be-library-examples

Author: devlights

examples/testing/be_library/err/Taskfile.yml

@@ -0,0 +1,9 @@
+# https://taskfile.dev
+
+version: '3'
+
+tasks:
+  default:
+    cmds:
+      - go test -v
+    ignore_error: true

examples/testing/be_library/err/be_err_test.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/nalgeon/be"
+)
+
+type (
+	ValueError struct {
+		V int
+	}
+)
+
+var _ error = (*ValueError)(nil)
+
+func (v *ValueError) Error() string {
+	return fmt.Sprintf("invalid value: %d", v.V)
+}
+
+var (
+	ErrInvalid = errors.New("invalid value")
+)
+
+func errSometime(v int) error {
+	switch {
+	case v > 100:
+		return &ValueError{v}
+	case v > 10:
+		return ErrInvalid
+	default:
+		return nil
+	}
+}
+
+func TestBeErr(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		be.Err(t, errSometime(1), nil)
+	})
+	t.Run("ng", func(t *testing.T) {
+		be.Err(t, errSometime(99), nil)
+	})
+	t.Run("return-nil", func(t *testing.T) {
+		err := errSometime(5)
+		be.Err(t, err, nil)
+	})
+	t.Run("return-err", func(t *testing.T) {
+		err := errSometime(99)
+		be.Err(t, err)
+	})
+	t.Run("check-message", func(t *testing.T) {
+		err := errSometime(20)
+		be.Err(t, err, "invalid") // 指定したメッセージが含まれていればOKとなる
+	})
+	t.Run("check-type-is", func(t *testing.T) {
+		err := errSometime(20)
+		be.Err(t, err, ErrInvalid)
+	})
+	t.Run("check-type-as", func(t *testing.T) {
+		err := errSometime(199)
+		be.Err(t, err, reflect.TypeFor[*ValueError]()) // Asの場合は reflect.Type を指定する
+	})
+}