internal/stub: move from container

This package solves a very specific stubbing use case, in a less than elegant manner.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/stub/call_test.go

@@ -0,0 +1,27 @@
+package stub_test
+
+import (
+	"reflect"
+	"testing"
+
+	"hakurei.app/internal/stub"
+)
+
+func TestCallError(t *testing.T) {
+	t.Parallel()
+
+	t.Run("contains false", func(t *testing.T) {
+		t.Parallel()
+		if err := new(stub.Call).Error(true, false, true); !reflect.DeepEqual(err, stub.ErrCheck) {
+			t.Errorf("Error: %#v, want %#v", err, stub.ErrCheck)
+		}
+	})
+
+	t.Run("passthrough", func(t *testing.T) {
+		t.Parallel()
+		wantErr := stub.UniqueError(0xbabe)
+		if err := (&stub.Call{Err: wantErr}).Error(true); !reflect.DeepEqual(err, wantErr) {
+			t.Errorf("Error: %#v, want %#v", err, wantErr)
+		}
+	})
+}