all: general cleanup readying for tagged release (#48)

- docs: add code coverage to readme
- internal/sessions: refactor sessions to clarify lifetime
- authenticate: simplified signin flow
- deployment: update go mods
- internal/testutil: removed package
- internal/singleflight: removed package

internal/testutil/testutil.go

@@ -1,46 +0,0 @@
-package testutil // import "github.com/pomerium/pomerium/internal/testutil"
-
-// testing util functions copied from https://github.com/benbjohnson/testing
-import (
-	"fmt"
-	"path/filepath"
-	"reflect"
-	"runtime"
-	"testing"
-)
-
-// Assert fails the test if the condition is false.
-func Assert(tb testing.TB, condition bool, msg string, v ...interface{}) {
-	if !condition {
-		_, file, line, _ := runtime.Caller(1)
-		fmt.Printf("\033[31m%s:%d: "+msg+"\033[39m\n\n", append([]interface{}{filepath.Base(file), line}, v...)...)
-		tb.FailNow()
-	}
-}
-
-// Ok fails the test if an err is not nil.
-func Ok(tb testing.TB, err error) {
-	if err != nil {
-		_, file, line, _ := runtime.Caller(1)
-		fmt.Printf("\033[31m%s:%d: unexpected error: %s\033[39m\n\n", filepath.Base(file), line, err.Error())
-		tb.FailNow()
-	}
-}
-
-// Equal fails the test if exp is not equal to act.
-func Equal(tb testing.TB, exp, act interface{}) {
-	if !reflect.DeepEqual(exp, act) {
-		_, file, line, _ := runtime.Caller(1)
-		fmt.Printf("\033[31m%s:%d:\n\n\texp: %#v\n\n\tgot: %#v\033[39m\n\n", filepath.Base(file), line, exp, act)
-		tb.FailNow()
-	}
-}
-
-// NotEqual fails the test if exp is equal to act.
-func NotEqual(tb testing.TB, exp, act interface{}) {
-	if reflect.DeepEqual(exp, act) {
-		_, file, line, _ := runtime.Caller(1)
-		fmt.Printf("\033[31m%s:%d:\n\n\texp: %#v\n\n\tgot: %#v\033[39m\n\n", filepath.Base(file), line, exp, act)
-		tb.FailNow()
-	}
-}