[gegl] tests: python tests - only run when building introspection and pygobject installed - use common test

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 12f3779996512425597226781ca2b3d7fa040135
Author: John Marshall <jtm home gmail com>
Date:   Sun Jun 14 07:59:57 2020 +0100

    tests: python tests
    - only run when building introspection and pygobject installed
    - use common test setup
    - use meson to set environment variables
    - change shebang to python3 in test files as this is always avaliable

 tests/meson.build                |  8 +++-----
 tests/python/meson.build         | 35 ++++++++++++-----------------------
 tests/python/test-gegl-buffer.py |  2 +-
 tests/python/test-gegl-color.py  |  2 +-
 tests/python/test-gegl-format.py |  2 +-
 tests/python/test-gegl-node.py   |  2 +-
 tests/python/test-gegl.py        |  2 +-
 7 files changed, 20 insertions(+), 33 deletions(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index f38937058..4c809b501 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -36,12 +36,10 @@ gegl_test_parallel = true
 # Tests
 subdir('simple')
 subdir('mipmap')
-
-if false
-  subdir('opencl')
+subdir('opencl')
+if pygobject3.found()
+  subdir('python')
 endif
-
-subdir('python')
 subdir('xml')
 subdir('ff-load-save')
 subdir('compositions')
diff --git a/tests/python/meson.build b/tests/python/meson.build
index 736183c6a..a2db1636c 100644
--- a/tests/python/meson.build
+++ b/tests/python/meson.build
@@ -1,5 +1,5 @@
 
-testnames = [
+python_tests = [
   'gegl-buffer',
   'gegl-color',
   'gegl-format',
@@ -7,26 +7,15 @@ testnames = [
   'gegl',
 ]
 
-ld_library_path = run_command(python, '-c',
-  '''import os; print(os.environ['LD_LIBRARY_PATH'])'''
-).stdout().strip()
-gi_typelib_path = run_command(python, '-c',
-  '''import os; print(os.environ['GI_TYPELIB_PATH'])'''
-).stdout().strip()
+python_test_env = gegl_test_env
+python_test_env.prepend('LD_LIBRARY_PATH', gegl_library_build_dir)
+python_test_env.prepend('GI_TYPELIB_PATH', gegl_library_build_dir)
 
-if python.found() and pygobject3.found()
-  foreach testname : testnames
-    testfile = 'test-' + testname + '.py'
-    test(testname,
-      find_program(testfile),
-      env: [
-        'LD_LIBRARY_PATH='+ meson.build_root() / 'gegl' + ':' + ld_library_path,
-        'GI_TYPELIB_PATH='+ meson.build_root() / 'gegl' + ':' + gi_typelib_path,
-        'GEGL_PATH='      + meson.build_root() / 'operations',
-        'GEGL_SWAP=RAM',
-      ],
-      suite: 'python',
-      is_parallel: false,
-    )
-  endforeach
-endif
+foreach _test : python_tests
+  test(_test.underscorify(),
+    find_program('test-' + _test + '.py'),
+    env: python_test_env,
+    suite: 'python',
+    is_parallel: gegl_test_parallel,
+  )
+endforeach
diff --git a/tests/python/test-gegl-buffer.py b/tests/python/test-gegl-buffer.py
index 44f827fae..ae2f25725 100755
--- a/tests/python/test-gegl-buffer.py
+++ b/tests/python/test-gegl-buffer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ This file is part of GEGL
  *
  * GEGL is free software; you can redistribute it and/or
diff --git a/tests/python/test-gegl-color.py b/tests/python/test-gegl-color.py
index b0ae4db9d..53ded2c7b 100755
--- a/tests/python/test-gegl-color.py
+++ b/tests/python/test-gegl-color.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ This file is part of GEGL
  *
  * GEGL is free software; you can redistribute it and/or
diff --git a/tests/python/test-gegl-format.py b/tests/python/test-gegl-format.py
index 99740a25e..5f9ba1276 100755
--- a/tests/python/test-gegl-format.py
+++ b/tests/python/test-gegl-format.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ This file is part of GEGL
  *
  * GEGL is free software; you can redistribute it and/or
diff --git a/tests/python/test-gegl-node.py b/tests/python/test-gegl-node.py
index a39949b51..309161ff6 100755
--- a/tests/python/test-gegl-node.py
+++ b/tests/python/test-gegl-node.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ This file is part of GEGL
  *
  * GEGL is free software; you can redistribute it and/or
diff --git a/tests/python/test-gegl.py b/tests/python/test-gegl.py
index 99666f2fa..a5270a24c 100755
--- a/tests/python/test-gegl.py
+++ b/tests/python/test-gegl.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ This file is part of GEGL
  *
  * GEGL is free software; you can redistribute it and/or