Remove dependecy to testify (#190)

* Log seed to replicate error

* Remove dependecy to testify

Fixes: #189

* Remove duplicated test

`TestParallel` duplicates `TestCacheDelRandomly`.

assert_test.go

@@ -0,0 +1,50 @@
+package bigcache
+
+import (
+	"bytes"
+	"fmt"
+	"path"
+	"reflect"
+	"runtime"
+	"testing"
+)
+
+func assertEqual(t *testing.T, expected, actual interface{}, msgAndArgs ...interface{}) {
+	if !objectsAreEqual(expected, actual) {
+		_, file, line, _ := runtime.Caller(1)
+		file = path.Base(file)
+		t.Errorf(fmt.Sprintf("\n%s:%d: Not equal: \n"+
+			"expected: %T(%#v)\n"+
+			"actual  : %T(%#v)\n",
+			file, line, expected, expected, actual, actual), msgAndArgs...)
+	}
+}
+
+func noError(t *testing.T, e error) {
+	if e != nil {
+		_, file, line, _ := runtime.Caller(1)
+		file = path.Base(file)
+		t.Errorf(fmt.Sprintf("\n%s:%d: Error is not nil: \n"+
+			"actual  : %T(%#v)\n", file, line, e, e))
+	}
+}
+
+func objectsAreEqual(expected, actual interface{}) bool {
+	if expected == nil || actual == nil {
+		return expected == actual
+	}
+
+	exp, ok := expected.([]byte)
+	if !ok {
+		return reflect.DeepEqual(expected, actual)
+	}
+
+	act, ok := actual.([]byte)
+	if !ok {
+		return false
+	}
+	if exp == nil || act == nil {
+		return exp == nil && act == nil
+	}
+	return bytes.Equal(exp, act)
+}