patch 8.1.1305: there is no easy way to manipulate environment variables
Problem: There is no easy way to manipulate environment variables.
Solution: Add environ(), getenv() and setenv(). (Yasuhiro Matsumoto,
closes #2875)
diff --git a/src/testdir/test_environ.vim b/src/testdir/test_environ.vim
new file mode 100644
index 0000000..094c4ce
--- /dev/null
+++ b/src/testdir/test_environ.vim
@@ -0,0 +1,44 @@
+scriptencoding utf-8
+
+func Test_environ()
+ unlet! $TESTENV
+ call assert_equal(0, has_key(environ(), 'TESTENV'))
+ let $TESTENV = 'foo'
+ call assert_equal(1, has_key(environ(), 'TESTENV'))
+ let $TESTENV = 'こんにちわ'
+ call assert_equal('こんにちわ', environ()['TESTENV'])
+endfunc
+
+func Test_getenv()
+ unlet! $TESTENV
+ call assert_equal(v:null, getenv('TESTENV'))
+ let $TESTENV = 'foo'
+ call assert_equal('foo', getenv('TESTENV'))
+endfunc
+
+func Test_setenv()
+ unlet! $TESTENV
+ call setenv('TEST ENV', 'foo')
+ call assert_equal('foo', getenv('TEST ENV'))
+ call setenv('TEST ENV', v:null)
+ call assert_equal(v:null, getenv('TEST ENV'))
+endfunc
+
+func Test_external_env()
+ call setenv('FOO', 'HelloWorld')
+ if has('win32')
+ let result = system('echo %FOO%')
+ else
+ let result = system('echo $FOO')
+ endif
+ let result = substitute(result, '[ \r\n]', '', 'g')
+ call assert_equal('HelloWorld', result)
+
+ call setenv('FOO', v:null)
+ if has('win32')
+ let result = system('set | grep ^FOO=')
+ else
+ let result = system('env | grep ^FOO=')
+ endif
+ call assert_equal('', result)
+endfunc