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69 lines
1.9 KiB
69 lines
1.9 KiB
// Package mtest implements functionality useful for testing.
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package mtest
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import (
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"context"
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"testing"
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"github.com/mediocregopher/mediocre-go-lib/mcfg"
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"github.com/mediocregopher/mediocre-go-lib/mcmp"
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"github.com/mediocregopher/mediocre-go-lib/mlog"
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"github.com/mediocregopher/mediocre-go-lib/mrun"
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)
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type envCmpKey int
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// Component creates and returns a root Component suitable for testing.
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func Component() *mcmp.Component {
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cmp := new(mcmp.Component)
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logger := mlog.NewLogger()
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logger.SetMaxLevel(mlog.DebugLevel)
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mlog.SetLogger(cmp, logger)
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mrun.InitHook(cmp, func(context.Context) error {
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envVals := mcmp.SeriesValues(cmp, envCmpKey(0))
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env := make([]string, 0, len(envVals))
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for _, val := range envVals {
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tup := val.([2]string)
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env = append(env, tup[0]+"="+tup[1])
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}
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return mcfg.Populate(cmp, &mcfg.SourceEnv{Env: env})
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})
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return cmp
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}
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// Env sets the given environment variable on the given Component, such that it
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// will be used as if it was a real environment variable when the Run function
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// from this package is called.
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//
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// This function will panic if not called on the root Component.
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func Env(cmp *mcmp.Component, key, val string) {
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if len(cmp.Path()) != 0 {
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panic("Env should only be called on the root Component")
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}
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mcmp.AddSeriesValue(cmp, envCmpKey(0), [2]string{key, val})
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}
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// Run performs the following using the given Component:
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//
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// - Calls mrun.Init, which calls mcfg.Populate using any variables set by Env.
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//
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// - Calls the passed in body callback.
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//
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// - Calls mrun.Shutdown
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//
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// The intention is that Run is used within a test on a Component created via
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// this package's Component function, after any instantiation functions have
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// been called (e.g. mnet.InstListener).
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func Run(cmp *mcmp.Component, t *testing.T, body func()) {
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if err := mrun.Init(context.Background(), cmp); err != nil {
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t.Fatal(err)
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}
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body()
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if err := mrun.Shutdown(context.Background(), cmp); err != nil {
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t.Fatal(err)
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}
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}
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