[folks] meson: Allow disabling build of tests

[Niels De Graef <nielsdg src gnome org>]

commit b9e27e284c481e876370e2eb73f95d0953fb9cda
Author: Mart Raudsepp <leio gentoo org>
Date:   Sun Aug 23 11:49:44 2020 +0300

    meson: Allow disabling build of tests
    
    Fixes https://gitlab.gnome.org/GNOME/folks/-/issues/121

 meson.build       | 21 +++++++++++++--------
 meson_options.txt |  1 +
 2 files changed, 14 insertions(+), 8 deletions(-)
---
diff --git a/meson.build b/meson.build
index 53d7dcc6..123edb5c 100644
--- a/meson.build
+++ b/meson.build
@@ -54,6 +54,7 @@ folks_backend_dir = get_option('libdir') / 'folks' / '@0@'.format(folks_module_v
 bluez_backend_enabled = get_option('bluez_backend')
 docs_enabled = get_option('docs')
 eds_backend_enabled = get_option('eds_backend')
+tests_enabled = get_option('tests')
 installed_tests_enabled = get_option('installed_tests')
 ofono_backend_enabled = get_option('ofono_backend')
 telepathy_backend_enabled = get_option('telepathy_backend')
@@ -130,13 +131,15 @@ endif
 
 if bluez_backend_enabled
   libebook_dep = dependency('libebook-1.2', version: '>=' + min_eds_version)
-  # Needed for the BlueZ tests
-  pymod = import('python')
-  py_installation = pymod.find_installation('python3',
-    modules: [
-      'dbusmock',
-    ],
-  )
+  if tests_enabled
+    # Needed for the BlueZ tests
+    pymod = import('python')
+    py_installation = pymod.find_installation('python3',
+      modules: [
+        'dbusmock',
+      ],
+    )
+  endif
 endif
 
 if import_tool_enabled
@@ -233,7 +236,9 @@ subdir('tools')
 subdir('po')
 
 # Tests
-subdir('tests')
+if tests_enabled
+  subdir('tests')
+endif
 
 if docs_enabled
   subdir('docs')
diff --git a/meson_options.txt b/meson_options.txt
index 43cd586a..62a9603c 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -11,6 +11,7 @@ option('inspect_tool', type: 'boolean', value: true, description: 'Enable buildi
 # Profiling
 option('profiling', type: 'boolean', value: false, description: 'Enable profiling code')
 # Test options
+option('tests', type: 'boolean', value: true, description: 'Build tests programs')
 option('installed_tests', type: 'boolean', value: false, description: 'Install test programs')
 # Docs
 option('docs', type: 'boolean', value: false, description: 'Enable documentation generation')