Improve test coverage. (#8)

* Improve test coverage.
* Remove unused http status code argument from SignInPageMethod.
* Removed log package in internal packages.
* Add test to check https scheme is used for authorization url.
* Add unit tests for global logging package.

internal/log/log.go

@@ -2,8 +2,6 @@
 package log // import "github.com/pomerium/pomerium/internal/log"
 
 import (
-	"context"
-	"io"
 	"net/http"
 	"os"
 
@@ -18,11 +16,6 @@ func SetDebugMode() {
 	Logger = Logger.Output(zerolog.ConsoleWriter{Out: os.Stdout})
 }
 
-// Output duplicates the global logger and sets w as its output.
-func Output(w io.Writer) zerolog.Logger {
-	return Logger.Output(w)
-}
-
 // With creates a child logger with the field added to its context.
 func With() zerolog.Context {
 	return Logger.With()
@@ -46,16 +39,6 @@ func Level(level zerolog.Level) zerolog.Logger {
 	return Logger.Level(level)
 }
 
-// Sample returns a logger with the s sampler.
-func Sample(s zerolog.Sampler) zerolog.Logger {
-	return Logger.Sample(s)
-}
-
-// Hook returns a logger with the h Hook.
-func Hook(h zerolog.Hook) zerolog.Logger {
-	return Logger.Hook(h)
-}
-
 // Debug starts a new message with debug level.
 //
 // You must call Msg on the returned event in order to send the event.
@@ -126,9 +109,3 @@ func Print(v ...interface{}) {
 func Printf(format string, v ...interface{}) {
 	Logger.Printf(format, v...)
 }
-
-// Ctx returns the Logger associated with the ctx. If no logger
-// is associated, a disabled logger is returned.
-func Ctx(ctx context.Context) *zerolog.Logger {
-	return zerolog.Ctx(ctx)
-}