functests: Add string() function tests

1 files changed, 175 insertions, 0 deletions

diff --git a/test/functional/eval/string_spec.lua b/test/functional/eval/string_spec.lua
new file mode 100644
index 0000000000..f7f5dca70a
--- /dev/null
+++ b/test/functional/eval/string_spec.lua
@@ -0,0 +1,175 @@
+local helpers = require('test.functional.helpers')
+local clear = helpers.clear
+local eq = helpers.eq
+local command = helpers.command
+local meths = helpers.meths
+local eval = helpers.eval
+local exc_exec = helpers.exc_exec
+local redir_exec = helpers.redir_exec
+local funcs = helpers.funcs
+local write_file = helpers.write_file
+
+describe('string() function', function()
+  before_each(clear)
+
+  describe('used to represent floating-point values', function()
+    it('dumps NaN values', function()
+      eq('str2float(\'nan\')', eval('string(str2float(\'nan\'))'))
+    end)
+
+    it('dumps infinite values', function()
+      eq('str2float(\'inf\')', eval('string(str2float(\'inf\'))'))
+      eq('-str2float(\'inf\')', eval('string(str2float(\'-inf\'))'))
+    end)
+
+    it('dumps regular values', function()
+      eq('1.5', funcs.string(1.5))
+      eq('1.56e-20', funcs.string(1.56000e-020))
+      eq('0.0', eval('string(0.0)'))
+    end)
+
+    it('dumps values with at most six digits after the decimal point',
+    function()
+      eq('1.234568e-20', funcs.string(1.23456789123456789123456789e-020))
+      eq('1.234568', funcs.string(1.23456789123456789123456789))
+    end)
+
+    it('dumps values with at most seven digits before the decimal point',
+    function()
+      eq('1234567.891235', funcs.string(1234567.89123456789123456789))
+      eq('1.234568e7', funcs.string(12345678.9123456789123456789))
+    end)
+
+    it('dumps negative values', function()
+      eq('-1.5', funcs.string(-1.5))
+      eq('-1.56e-20', funcs.string(-1.56000e-020))
+      eq('-1.234568e-20', funcs.string(-1.23456789123456789123456789e-020))
+      eq('-1.234568', funcs.string(-1.23456789123456789123456789))
+      eq('-1234567.891235', funcs.string(-1234567.89123456789123456789))
+      eq('-1.234568e7', funcs.string(-12345678.9123456789123456789))
+    end)
+  end)
+
+  describe('used to represent numbers', function()
+    it('dumps regular values', function()
+      eq('0', funcs.string(0))
+      eq('-1', funcs.string(-1))
+      eq('1', funcs.string(1))
+    end)
+
+    it('dumps large values', function()
+      eq('2147483647', funcs.string(2^31-1))
+      eq('-2147483648', funcs.string(-2^31))
+    end)
+  end)
+
+  describe('used to represent strings', function()
+    it('dumps regular strings', function()
+      eq('\'test\'', funcs.string('test'))
+    end)
+
+    it('dumps empty strings', function()
+      eq('\'\'', funcs.string(''))
+    end)
+
+    it('dumps strings with \' inside', function()
+      eq('\'\'\'\'\'\'\'\'', funcs.string('\'\'\''))
+      eq('\'a\'\'b\'\'\'\'\'', funcs.string('a\'b\'\''))
+      eq('\'\'\'b\'\'\'\'d\'', funcs.string('\'b\'\'d'))
+      eq('\'a\'\'b\'\'c\'\'d\'', funcs.string('a\'b\'c\'d'))
+    end)
+  end)
+
+  describe('used to represent funcrefs', function()
+    local fname = 'Xtest-functional-eval-string_spec-fref-script.vim'
+
+    before_each(function()
+      write_file(fname, [[
+        function Test1()
+        endfunction
+
+        function s:Test2()
+        endfunction
+
+        function g:Test3()
+        endfunction
+
+        let g:Test2_f = function('s:Test2')
+      ]])
+      command('source ' .. fname)
+    end)
+
+    after_each(function()
+      os.remove(fname)
+    end)
+
+    it('dumps references to built-in functions', function()
+      eq('function(\'function\')', eval('string(function("function"))'))
+    end)
+
+    it('dumps references to user functions', function()
+      eq('function(\'Test1\')', eval('string(function("Test1"))'))
+      eq('function(\'g:Test3\')', eval('string(function("g:Test3"))'))
+    end)
+
+    it('dumps references to script functions', function()
+      eq('function(\'<SNR>1_Test2\')', eval('string(Test2_f)'))
+    end)
+  end)
+
+  describe('used to represent lists', function()
+    it('dumps empty list', function()
+      eq('[]', funcs.string({}))
+    end)
+
+    it('dumps nested lists', function()
+      eq('[[[[[]]]]]', funcs.string({{{{{}}}}}))
+    end)
+
+    it('dumps nested non-empty lists', function()
+      eq('[1, [[3, [[5], 4]], 2]]', funcs.string({1, {{3, {{5}, 4}}, 2}}))
+    end)
+
+    it('errors when dumping recursive lists', function()
+      meths.set_var('l', {})
+      eval('add(l, l)')
+      eq('Vim(echo):E724: unable to correctly dump variable with self-referencing container',
+         exc_exec('echo string(l)'))
+    end)
+
+    it('dumps recursive lists despite the error', function()
+      meths.set_var('l', {})
+      eval('add(l, l)')
+      eq('\nE724: unable to correctly dump variable with self-referencing container\n[{E724@0}]',
+         redir_exec('echo string(l)'))
+      eq('\nE724: unable to correctly dump variable with self-referencing container\n[[{E724@1}]]',
+         redir_exec('echo string([l])'))
+    end)
+  end)
+
+  describe('used to represent dictionaries', function()
+    it('dumps empty dictionary', function()
+      eq('{}', eval('string({})'))
+    end)
+
+    it('dumps non-empty dictionary', function()
+      eq('{\'t\'\'est\': 1}', funcs.string({['t\'est']=1}))
+    end)
+
+    it('errors when dumping recursive dictionaries', function()
+      meths.set_var('d', {d=1})
+      eval('extend(d, {"d": d})')
+      eq('Vim(echo):E724: unable to correctly dump variable with self-referencing container',
+         exc_exec('echo string(d)'))
+    end)
+
+    it('dumps recursive dictionaries despite the error', function()
+      meths.set_var('d', {d=1})
+      eval('extend(d, {"d": d})')
+      eq('\nE724: unable to correctly dump variable with self-referencing container\n{\'d\': {E724@0}}',
+         redir_exec('echo string(d)'))
+      eq('\nE724: unable to correctly dump variable with self-referencing container\n{\'out\': {\'d\': {E724@1}}}',
+         redir_exec('echo string({"out": d})'))
+    end)
+  end)
+end)