Switch tests to use meson

Switches tests to use "meson test" instead of a shell script.  This also
means that they now fully respect user-specified toolchain (e.g. clang
compiler, custom CFLAGS, etc).  Running C++ test is conditional on
enabling INIReader support in the build.

```
 1/16 test_multi                               OK              0.05s
 2/16 test_multi_max_line                      OK              0.04s
 3/16 test_single                              OK              0.04s
 4/16 test_disallow_inline_comments            OK              0.03s
 5/16 test_stop_on_first_error                 OK              0.03s
 6/16 test_handler_lineno                      OK              0.02s
 7/16 test_heap                                OK              0.06s
 8/16 test_string                              OK              0.06s
 9/16 test_heap_max_line                       OK              0.05s
10/16 test_heap_realloc                        OK              0.05s
11/16 test_heap_realloc_max_line               OK              0.05s
12/16 test_heap_string                         OK              0.04s
13/16 test_call_handler_on_new_section         OK              0.04s
14/16 test_allow_no_value                      OK              0.03s
15/16 test_alloc                               OK              0.02s
16/16 test_INIReaderExample                    OK              0.02s

Ok:                 16
Expected Fail:      0
Fail:               0
Unexpected Pass:    0
Skipped:            0
Timeout:            0
```

examples/meson.build

@@ -0,0 +1,4 @@
+runtest = files(join_paths(meson.project_source_root(), 'runtest.sh'))
+
+unittest_INIReaderExample = executable('unittest_INIReaderExample', src_inih, src_INIReader, 'INIReaderExample.cpp', cpp_args : ['-Wall'])
+test('test_INIReaderExample', runtest, depends : [unittest_INIReaderExample], args : [files('cpptest.txt'), unittest_INIReaderExample.full_path()])

meson.build

@@ -71,8 +71,10 @@ endif
 #### inih ####
 inc_inih = include_directories('.')
 
+src_inih = files('ini.c')
+
 lib_inih = library('inih',
-    ['ini.c'],
+    [src_inih],
     include_directories : inc_inih,
     c_args : [arg_static, extra_args],
     install : distro_install,
@@ -96,13 +98,17 @@ inih_dep = declare_dependency(
     include_directories : inc_inih
 )
 
+subdir('tests')
+
 #### INIReader ####
 if get_option('with_INIReader')
     add_languages('cpp')
     inc_INIReader = include_directories('cpp')
 
+    src_INIReader = files(join_paths('cpp', 'INIReader.cpp'))
+
     lib_INIReader = library('INIReader',
-        ['cpp/INIReader.cpp'],
+        src_INIReader,
         cpp_args : extra_args,
         include_directories : inc_INIReader,
         dependencies : inih_dep,
@@ -126,4 +132,6 @@ if get_option('with_INIReader')
         include_directories : inc_INIReader,
         compile_args : extra_args
     )
+
+    subdir('examples')
 endif

runtest.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd "$(dirname "${1}")"
+diff "${1}" <("${2}")

tests/meson.build

@@ -0,0 +1,46 @@
+runtest = files(join_paths(meson.project_source_root(), 'runtest.sh'))
+
+unittest_multi = executable('unittest_multi', src_inih, 'unittest.c', c_args : ['-Wall'])
+test('test_multi', runtest, depends : [unittest_multi], args : [files('baseline_multi.txt'), unittest_multi.full_path()])
+
+unittest_multi_max_line = executable('unittest_multi_max_line', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_MAX_LINE=20'])
+test('test_multi_max_line', runtest, depends : [unittest_multi_max_line], args : [files('baseline_multi_max_line.txt'), unittest_multi_max_line.full_path()])
+
+unittest_single = executable('unittest_single', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_ALLOW_MULTILINE=0'])
+test('test_single', runtest, depends : [unittest_single], args : [files('baseline_single.txt'), unittest_single.full_path()])
+
+unittest_disallow_inline_comments = executable('unittest_disallow_inline_comments', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_ALLOW_INLINE_COMMENTS=0'])
+test('test_disallow_inline_comments', runtest, depends : [unittest_disallow_inline_comments], args : [files('baseline_disallow_inline_comments.txt'), unittest_disallow_inline_comments.full_path()])
+
+unittest_stop_on_first_error = executable('unittest_stop_on_first_error', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_STOP_ON_FIRST_ERROR=1'])
+test('test_stop_on_first_error', runtest, depends : [unittest_stop_on_first_error], args : [files('baseline_stop_on_first_error.txt'), unittest_stop_on_first_error.full_path()])
+
+unittest_handler_lineno = executable('unittest_handler_lineno', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_HANDLER_LINENO=1'])
+test('test_handler_lineno', runtest, depends : [unittest_handler_lineno], args : [files('baseline_handler_lineno.txt'), unittest_handler_lineno.full_path()])
+
+unittest_string = executable('unittest_string', src_inih, 'unittest_string.c', c_args : ['-Wall', '-DINI_MAX_LINE=20'])
+test('test_string', runtest, depends : [unittest_string], args : [files('baseline_string.txt'), unittest_string.full_path()])
+
+unittest_heap = executable('unittest_heap', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_USE_STACK=0'])
+test('test_heap', runtest, depends : [unittest_heap], args : [files('baseline_heap.txt'), unittest_heap.full_path()])
+
+unittest_heap_max_line = executable('unittest_heap_max_line', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_USE_STACK=0', '-DINI_MAX_LINE=20', '-DINI_INITIAL_ALLOC=20'])
+test('test_heap_max_line', runtest, depends : [unittest_heap_max_line], args : [files('baseline_heap_max_line.txt'), unittest_heap_max_line.full_path()])
+
+unittest_heap_realloc = executable('unittest_heap_realloc', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_USE_STACK=0', '-DINI_ALLOW_REALLOC=1', '-DINI_INITIAL_ALLOC=5'])
+test('test_heap_realloc', runtest, depends : [unittest_heap_realloc], args : [files('baseline_heap_realloc.txt'), unittest_heap_realloc.full_path()])
+
+unittest_heap_realloc_max_line = executable('unittest_heap_realloc_max_line', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_USE_STACK=0', '-DINI_MAX_LINE=20', '-DINI_ALLOW_REALLOC=1', '-DINI_INITIAL_ALLOC=5'])
+test('test_heap_realloc_max_line', runtest, depends : [unittest_heap_realloc_max_line], args : [files('baseline_heap_realloc_max_line.txt'), unittest_heap_realloc_max_line.full_path()])
+
+unittest_heap_string = executable('unittest_heap_string', src_inih, 'unittest_string.c', c_args : ['-Wall', '-DINI_USE_STACK=0', '-DINI_MAX_LINE=20', '-DINI_INITIAL_ALLOC=20'])
+test('test_heap_string', runtest, depends : [unittest_heap_string], args : [files('baseline_heap_string.txt'), unittest_heap_string.full_path()])
+
+unittest_call_handler_on_new_section = executable('unittest_call_handler_on_new_section', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_CALL_HANDLER_ON_NEW_SECTION=1'])
+test('test_call_handler_on_new_section', runtest, depends : [unittest_call_handler_on_new_section], args : [files('baseline_call_handler_on_new_section.txt'), unittest_call_handler_on_new_section.full_path()])
+
+unittest_allow_no_value = executable('unittest_allow_no_value', src_inih, 'unittest.c', c_args : ['-Wall', '-DINI_ALLOW_NO_VALUE=1'])
+test('test_allow_no_value', runtest, depends : [unittest_allow_no_value], args : [files('baseline_allow_no_value.txt'), unittest_allow_no_value.full_path()])
+
+unittest_alloc = executable('unittest_alloc', src_inih, 'unittest_alloc.c', c_args : ['-Wall', '-DINI_CUSTOM_ALLOCATOR=1', '-DINI_USE_STACK=0', '-DINI_ALLOW_REALLOC=1', '-DINI_INITIAL_ALLOC=12'])
+test('test_alloc', runtest, depends : [unittest_alloc], args : [files('baseline_alloc.txt'), unittest_alloc.full_path()])