don't use the default configuration in tests

main_test.go

@@ -50,7 +50,11 @@ func (suite tests) run(t *testing.T) {
  t.Run(name, func(t *testing.T) {
  b, err := yaml.Marshal(configuration{
  Registry: registry{
- Location: t.TempDir(),
+ // Add a "one/two" subdirectory because the path is unlikely
+ // to be used in the code, and it will detect a regression
+ // if using a non-existing directory causes the program to
+ // fail.
+ Location: filepath.Join(t.TempDir(), "one", "two"),
  },
  Cache: cache{
  Location: os.Getenv("TIMECRAFT_TEST_CACHE"),

run_test.go

@@ -1,7 +1,6 @@
 package main_test
 
 import (
- "path/filepath"
  "testing"
 
  "github.com/stealthrocket/timecraft/internal/assert"
@@ -21,13 +20,4 @@ var run = tests{
  assert.HasPrefix(t, stdout, "Usage:\ttimecraft run ")
  assert.Equal(t, stderr, "")
  },
-
- "running with a configuration file which does not exist uses the default location": func(t *testing.T) {
- t.Setenv("TIMECRAFTCONFIG", filepath.Join(t.TempDir(), "path", "to", "nowehere.yaml"))
-
- stdout, stderr, exitCode := timecraft(t, "run", "./testdata/go/sleep.wasm", "0")
- assert.Equal(t, exitCode, 0)
- assert.Equal(t, stdout, "sleeping for 0s\n")
- assert.NotEqual(t, stderr, "")
- },
 }