tests: refactor: migrate to newly-added create_stub()

test/init.bats

@@ -2,10 +2,6 @@
 
 load test_helper
 
-_setup() {
-  export PATH="${PYENV_TEST_DIR}/bin:$PATH"
-}
-
 @test "creates shims and versions directories" {
   assert [ ! -d "${PYENV_ROOT}/shims" ]
   assert [ ! -d "${PYENV_ROOT}/versions" ]
@@ -171,16 +167,14 @@ echo "\$PATH"
 }
 
 @test "outputs sh-compatible case syntax" {
-  create_path_executable pyenv-commands <<!
-#!$BASH
+  create_stub pyenv-commands <<!
 echo -e 'activate\ndeactivate\nrehash\nshell'
 !
   run pyenv-init - bash
   assert_success
   assert_line '  activate|deactivate|rehash|shell)'
 
-  create_path_executable pyenv-commands <<!
-#!$BASH
+  create_stub pyenv-commands <<!
 echo
 !
   run pyenv-init - bash

test/latest.bats

@@ -2,13 +2,8 @@
 
 load test_helper
 
-_setup() {
-  export PATH="${PYENV_TEST_DIR}/bin:$PATH"
-}
-
 @test "read from installed" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo 4.5.6
 !
   run pyenv-latest 4
@@ -19,8 +14,7 @@ echo 4.5.6
 }
 
 @test "read from known" {
-  create_path_executable python-build <<!
-#!$BASH
+  create_stub python-build <<!
 echo 4.5.6
 !
   run pyenv-latest -k 4
@@ -31,8 +25,7 @@ echo 4.5.6
 }
 
 @test "installed version not found" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo 3.5.6
 echo 3.10.8
 !
@@ -44,8 +37,7 @@ pyenv: no installed versions match the prefix \`3.8'
 }
 
 @test "known version not found" {
-  create_path_executable python-build <<!
-#!$BASH
+  create_stub python-build <<!
 echo 3.5.6
 echo 3.10.8
 !
@@ -57,8 +49,7 @@ pyenv: no known versions match the prefix \`3.8'
 }
 
 @test "complete name resolves to itself" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo foo
 echo foo.bar
 !
@@ -72,8 +63,7 @@ foo
 }
 
 @test "sort CPython" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo 2.7.18
 echo 3.5.6
 echo 3.10.8
@@ -87,8 +77,7 @@ echo 3.10.6
 }
 
 @test "ignores rolling releases, branch tips, alternative srcs, prereleases, virtualenvs; 't' versions if prefix without 't'" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo 3.8.5-dev
 echo 3.8.5-src
 echo 3.8.5-latest
@@ -109,8 +98,7 @@ echo 3.8.1/envs/foo
 }
 
 @test "resolves to a 't' version if prefix has 't'" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
+  create_stub pyenv-versions <<!
 echo 3.13.2t
 echo 3.13.5
 echo 3.13.5t
@@ -124,9 +112,7 @@ echo 3.14.6
 }
 
 @test "falls back to argument with -b" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
-!
+  create_stub pyenv-versions
   run pyenv-latest -b nonexistent
   assert_failure
   assert_output <<!
@@ -135,9 +121,7 @@ nonexistent
 }
 
 @test "falls back to argument and succeeds with -f" {
-  create_path_executable pyenv-versions <<!
-#!$BASH
-!
+  create_stub pyenv-versions
   run pyenv-latest -f nonexistent
   assert_success
   assert_output <<!