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/pg/v10/error.go

@@ -0,0 +1,69 @@
+package pg
+
+import (
+	"net"
+
+	"github.com/go-pg/pg/v10/internal"
+)
+
+// ErrNoRows is returned by QueryOne and ExecOne when query returned zero rows
+// but at least one row is expected.
+var ErrNoRows = internal.ErrNoRows
+
+// ErrMultiRows is returned by QueryOne and ExecOne when query returned
+// multiple rows but exactly one row is expected.
+var ErrMultiRows = internal.ErrMultiRows
+
+// Error represents an error returned by PostgreSQL server
+// using PostgreSQL ErrorResponse protocol.
+//
+// https://www.postgresql.org/docs/10/static/protocol-message-formats.html
+type Error interface {
+	error
+
+	// Field returns a string value associated with an error field.
+	//
+	// https://www.postgresql.org/docs/10/static/protocol-error-fields.html
+	Field(field byte) string
+
+	// IntegrityViolation reports whether an error is a part of
+	// Integrity Constraint Violation class of errors.
+	//
+	// https://www.postgresql.org/docs/10/static/errcodes-appendix.html
+	IntegrityViolation() bool
+}
+
+var _ Error = (*internal.PGError)(nil)
+
+func isBadConn(err error, allowTimeout bool) bool {
+	if err == nil {
+		return false
+	}
+	if _, ok := err.(internal.Error); ok {
+		return false
+	}
+	if pgErr, ok := err.(Error); ok {
+		switch pgErr.Field('V') {
+		case "FATAL", "PANIC":
+			return true
+		}
+		switch pgErr.Field('C') {
+		case "25P02", // current transaction is aborted
+			"57014": // canceling statement due to user request
+			return true
+		}
+		return false
+	}
+	if allowTimeout {
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			return !netErr.Temporary()
+		}
+	}
+	return true
+}
+
+//------------------------------------------------------------------------------
+
+type timeoutError interface {
+	Timeout() bool
+}