1 files changed, 171 insertions, 0 deletions
diff --git a/test/functional/eval/special_vars_spec.lua b/test/functional/eval/special_vars_spec.lua
new file mode 100644
index 0000000000..6ab4e6a7d7
--- /dev/null
+++ b/test/functional/eval/special_vars_spec.lua
@@ -0,0 +1,171 @@
+local helpers = require('test.functional.helpers')
+local exc_exec = helpers.exc_exec
+local execute = helpers.execute
+local meths = helpers.meths
+local funcs = helpers.funcs
+local meths = helpers.meths
+local clear = helpers.clear
+local eval = helpers.eval
+local eq = helpers.eq
+
+describe('Special values', function()
+  before_each(clear)
+
+  it('do not cause error when freed', function()
+    execute([[
+      function Test()
+        try
+          return v:true
+        finally
+          return 'something else'
+        endtry
+      endfunction
+    ]])
+    eq(0, exc_exec('call Test()'))
+  end)
+
+  it('work with empty()', function()
+    eq(0, funcs.empty(true))
+    eq(1, funcs.empty(false))
+    eq(1, funcs.empty(NIL))
+  end)
+
+  it('can be stringified and eval’ed back', function()
+    eq(true, funcs.eval(funcs.string(true)))
+    eq(false, funcs.eval(funcs.string(false)))
+    eq(NIL, funcs.eval(funcs.string(NIL)))
+  end)
+
+  it('work with is/isnot properly', function()
+    eq(1, eval('v:null is v:null'))
+    eq(0, eval('v:null is v:true'))
+    eq(0, eval('v:null is v:false'))
+    eq(1, eval('v:true is v:true'))
+    eq(0, eval('v:true is v:false'))
+    eq(1, eval('v:false is v:false'))
+
+    eq(0, eval('v:null  is 0'))
+    eq(0, eval('v:true  is 0'))
+    eq(0, eval('v:false is 0'))
+
+    eq(0, eval('v:null  is 1'))
+    eq(0, eval('v:true  is 1'))
+    eq(0, eval('v:false is 1'))
+
+    eq(0, eval('v:null  is ""'))
+    eq(0, eval('v:true  is ""'))
+    eq(0, eval('v:false is ""'))
+
+    eq(0, eval('v:null  is "null"'))
+    eq(0, eval('v:true  is "true"'))
+    eq(0, eval('v:false is "false"'))
+
+    eq(0, eval('v:null  is []'))
+    eq(0, eval('v:true  is []'))
+    eq(0, eval('v:false is []'))
+
+    eq(0, eval('v:null isnot v:null'))
+    eq(1, eval('v:null isnot v:true'))
+    eq(1, eval('v:null isnot v:false'))
+    eq(0, eval('v:true isnot v:true'))
+    eq(1, eval('v:true isnot v:false'))
+    eq(0, eval('v:false isnot v:false'))
+
+    eq(1, eval('v:null  isnot 0'))
+    eq(1, eval('v:true  isnot 0'))
+    eq(1, eval('v:false isnot 0'))
+
+    eq(1, eval('v:null  isnot 1'))
+    eq(1, eval('v:true  isnot 1'))
+    eq(1, eval('v:false isnot 1'))
+
+    eq(1, eval('v:null  isnot ""'))
+    eq(1, eval('v:true  isnot ""'))
+    eq(1, eval('v:false isnot ""'))
+
+    eq(1, eval('v:null  isnot "null"'))
+    eq(1, eval('v:true  isnot "true"'))
+    eq(1, eval('v:false isnot "false"'))
+
+    eq(1, eval('v:null  isnot []'))
+    eq(1, eval('v:true  isnot []'))
+    eq(1, eval('v:false isnot []'))
+  end)
+
+  it('work with +/-/* properly', function()
+    eq(1, eval('0 + v:true'))
+    eq(0, eval('0 + v:null'))
+    eq(0, eval('0 + v:false'))
+
+    eq(-1, eval('0 - v:true'))
+    eq( 0, eval('0 - v:null'))
+    eq( 0, eval('0 - v:false'))
+
+    eq(1, eval('1 * v:true'))
+    eq(0, eval('1 * v:null'))
+    eq(0, eval('1 * v:false'))
+  end)
+
+  it('does not work with +=/-=/.=', function()
+    meths.set_var('true', true)
+    meths.set_var('false', false)
+    execute('let null = v:null')
+
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let true  += 1'))
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let false += 1'))
+    eq('Vim(let):E734: Wrong variable type for +=', exc_exec('let null  += 1'))
+
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let true  -= 1'))
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let false -= 1'))
+    eq('Vim(let):E734: Wrong variable type for -=', exc_exec('let null  -= 1'))
+
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let true  .= 1'))
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let false .= 1'))
+    eq('Vim(let):E734: Wrong variable type for .=', exc_exec('let null  .= 1'))
+  end)
+
+  it('work with . (concat) properly', function()
+    eq("true", eval('"" . v:true'))
+    eq("null", eval('"" . v:null'))
+    eq("false", eval('"" . v:false'))
+  end)
+
+  it('work with type()', function()
+    eq(6, funcs.type(true))
+    eq(6, funcs.type(false))
+    eq(7, funcs.type(NIL))
+  end)
+
+  it('work with copy() and deepcopy()', function()
+    eq(true, funcs.deepcopy(true))
+    eq(false, funcs.deepcopy(false))
+    eq(NIL, funcs.deepcopy(NIL))
+
+    eq(true, funcs.copy(true))
+    eq(false, funcs.copy(false))
+    eq(NIL, funcs.copy(NIL))
+  end)
+
+  it('fails in index', function()
+    eq('Vim(echo):E909: Cannot index a special variable', exc_exec('echo v:true[0]'))
+    eq('Vim(echo):E909: Cannot index a special variable', exc_exec('echo v:false[0]'))
+    eq('Vim(echo):E909: Cannot index a special variable', exc_exec('echo v:null[0]'))
+  end)
+
+  it('is accepted by assert_true and assert_false', function()
+    funcs.assert_false(false)
+    funcs.assert_false(true)
+    funcs.assert_false(NIL)
+
+    funcs.assert_true(false)
+    funcs.assert_true(true)
+    funcs.assert_true(NIL)
+
+    eq({
+      'Expected False but got v:true',
+      'Expected False but got v:null',
+      'Expected True but got v:false',
+      'Expected True but got v:null',
+    }, meths.get_vvar('errors'))
+  end)
+end)