Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/go-pg/zerochecker/LICENSE

@@ -0,0 +1,24 @@
+Copyright (c) 2013 github.com/go-pg/pg Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/go-pg/zerochecker/go.mod

@@ -0,0 +1,3 @@
+module github.com/go-pg/zerochecker
+
+go 1.13

vendor/github.com/go-pg/zerochecker/zerochecker.go

@@ -0,0 +1,126 @@
+package zerochecker
+
+import (
+	"database/sql/driver"
+	"reflect"
+)
+
+var driverValuerType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
+var appenderType = reflect.TypeOf((*valueAppender)(nil)).Elem()
+var isZeroerType = reflect.TypeOf((*isZeroer)(nil)).Elem()
+
+type isZeroer interface {
+	IsZero() bool
+}
+
+type valueAppender interface {
+	AppendValue(b []byte, flags int) ([]byte, error)
+}
+
+type Func func(reflect.Value) bool
+
+func Checker(typ reflect.Type) Func {
+	if typ.Implements(isZeroerType) {
+		return isZeroInterface
+	}
+
+	switch typ.Kind() {
+	case reflect.Array:
+		if typ.Elem().Kind() == reflect.Uint8 {
+			return isZeroBytes
+		}
+		return isZeroLen
+	case reflect.String:
+		return isZeroLen
+	case reflect.Bool:
+		return isZeroBool
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return isZeroInt
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return isZeroUint
+	case reflect.Float32, reflect.Float64:
+		return isZeroFloat
+	case reflect.Interface, reflect.Ptr, reflect.Slice, reflect.Map:
+		return isNil
+	}
+
+	if typ.Implements(appenderType) {
+		return isZeroAppenderValue
+	}
+	if typ.Implements(driverValuerType) {
+		return isZeroDriverValue
+	}
+
+	return isZeroFalse
+}
+
+func isZeroInterface(v reflect.Value) bool {
+	if v.Kind() == reflect.Ptr && v.IsNil() {
+		return true
+	}
+	return v.Interface().(isZeroer).IsZero()
+}
+
+func isZeroAppenderValue(v reflect.Value) bool {
+	if v.Kind() == reflect.Ptr {
+		return v.IsNil()
+	}
+
+	appender := v.Interface().(valueAppender)
+	value, err := appender.AppendValue(nil, 0)
+	if err != nil {
+		return false
+	}
+	return value == nil
+}
+
+func isZeroDriverValue(v reflect.Value) bool {
+	if v.Kind() == reflect.Ptr {
+		return v.IsNil()
+	}
+
+	valuer := v.Interface().(driver.Valuer)
+	value, err := valuer.Value()
+	if err != nil {
+		return false
+	}
+	return value == nil
+}
+
+func isZeroLen(v reflect.Value) bool {
+	return v.Len() == 0
+}
+
+func isNil(v reflect.Value) bool {
+	return v.IsNil()
+}
+
+func isZeroBool(v reflect.Value) bool {
+	return !v.Bool()
+}
+
+func isZeroInt(v reflect.Value) bool {
+	return v.Int() == 0
+}
+
+func isZeroUint(v reflect.Value) bool {
+	return v.Uint() == 0
+}
+
+func isZeroFloat(v reflect.Value) bool {
+	return v.Float() == 0
+}
+
+func isZeroBytes(v reflect.Value) bool {
+	b := v.Slice(0, v.Len()).Bytes()
+	for _, c := range b {
+		if c != 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func isZeroFalse(v reflect.Value) bool {
+	return false
+}