# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1448815504 -3600
# Node ID 6600871bb38c10a2837c53ee13cfd8df68a7a888
# Parent  b03d6d4fe42be199f7d23ccb5709cdd7dcba260f
commit https://github.com/vim/vim/commit/43345546ae63710441f066648b8485fb545b3801
Author: Bram Moolenaar <Bram@vim.org>
Date:   Sun Nov 29 17:35:35 2015 +0100

    patch 7.4.944
    Problem:    Writing tests for Vim script is hard.
    Solution:   Add assertEqual(), assertFalse() and assertTrue() functions.  Add
                the v:errors variable.  Add the runtest script. Add a first new
                style test script.

diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 7.4.  Last change: 2015 Sep 19
+*eval.txt*	For Vim version 7.4.  Last change: 2015 Nov 29
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1379,6 +1379,15 @@ v:errmsg	Last given error message.  It's
 	:  ... handle error
 <		"errmsg" also works, for backwards compatibility.
 
+					*v:errors* *errors-variable*
+v:errors	Errors found by assert functions, such as |assertTrue()|.
+		This is a list of strings.
+		The assert functions append an item when an assert fails.
+		To remove old results make it empty: >
+	:let v:errors = []
+<		If v:errors is set to anything but a list it is made an empty
+		list by the assert function.
+
 					*v:exception* *exception-variable*
 v:exception	The value of the exception most recently caught and not
 		finished.  See also |v:throwpoint| and |throw-variables|.
@@ -1737,6 +1746,9 @@ arglistid( [{winnr}, [ {tabnr}]])
 				Number	argument list id
 argv( {nr})			String	{nr} entry of the argument list
 argv( )				List	the argument list
+assertEqual( {exp}, {act})  	none    assert that {exp} equals {act}
+assertFalse( {actual})		none    assert that {actual} is false
+assertTrue( {actual})		none    assert that {actual} is true
 asin( {expr})			Float	arc sine of {expr}
 atan( {expr})			Float	arc tangent of {expr}
 atan2( {expr}, {expr})		Float   arc tangent of {expr1} / {expr2}
@@ -2154,6 +2166,31 @@ argv([{nr}])	The result is the {nr}th fi
 <		Without the {nr} argument a |List| with the whole |arglist| is
 		returned.
 
+							*assertEqual()*
+assertEqual({expected}, {actual})
+		When {expected} and {actual} are not equal an error message is
+		added to |v:errors|.
+		There is no automatic conversion, the String "4" is different
+		from the Number 4.  And the number 4 is different from the
+		Float 4.0.  The value of 'ignorecase' is not used here, case
+		always matters.
+		Example: >
+	assertEqual('foo', 'bar')
+<		Will result in a string to be added to |v:errors|:
+	test.vim line 12: Expected 'foo' but got 'bar' ~
+
+assertFalse({actual})					*assertFalse()*
+		When {actual} is not false an error message is added to
+		|v:errors|, like with |assertEqual()|..
+		A value is false when it is zero. When "{actual}" is not a
+		number the assert fails.
+
+assertTrue({actual})					*assertTrue()*
+		When {actual} is not true an error message is added to
+		|v:errors|, like with |assertEqual()|..
+		A value is true when it is a non-zeron number.  When {actual}
+		is not a number the assert fails.
+
 asin({expr})						*asin()*
 		Return the arc sine of {expr} measured in radians, as a |Float|
 		in the range of [-pi/2, pi/2].
diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -368,6 +368,7 @@ static struct vimvar
     {VV_NAME("option_new",	 VAR_STRING), VV_RO},
     {VV_NAME("option_old",	 VAR_STRING), VV_RO},
     {VV_NAME("option_type",	 VAR_STRING), VV_RO},
+    {VV_NAME("errors",		 VAR_LIST), 0},
 };
 
 /* shorthand */
@@ -472,6 +473,9 @@ static void f_argc __ARGS((typval_T *arg
 static void f_argidx __ARGS((typval_T *argvars, typval_T *rettv));
 static void f_arglistid __ARGS((typval_T *argvars, typval_T *rettv));
 static void f_argv __ARGS((typval_T *argvars, typval_T *rettv));
+static void f_assertEqual __ARGS((typval_T *argvars, typval_T *rettv));
+static void f_assertFalse __ARGS((typval_T *argvars, typval_T *rettv));
+static void f_assertTrue __ARGS((typval_T *argvars, typval_T *rettv));
 #ifdef FEAT_FLOAT
 static void f_asin __ARGS((typval_T *argvars, typval_T *rettv));
 static void f_atan __ARGS((typval_T *argvars, typval_T *rettv));
@@ -8068,6 +8072,9 @@ static struct fst
     {"argidx",		0, 0, f_argidx},
     {"arglistid",	0, 2, f_arglistid},
     {"argv",		0, 1, f_argv},
+    {"assertEqual",	2, 3, f_assertEqual},
+    {"assertFalse",	1, 2, f_assertFalse},
+    {"assertTrue",	1, 2, f_assertTrue},
 #ifdef FEAT_FLOAT
     {"asin",		1, 1, f_asin},	/* WJMc */
     {"atan",		1, 1, f_atan},
@@ -9124,6 +9131,113 @@ f_argv(argvars, rettv)
 					       alist_name(&ARGLIST[idx]), -1);
 }
 
+static void assertError __ARGS((garray_T *gap));
+static void prepareForAssertError __ARGS((garray_T*gap));
+static void assertBool __ARGS((typval_T *argvars, int isTrue));
+
+/*
+ * Add an assert error to v:errors.
+ */
+    static void
+assertError(gap)
+    garray_T	*gap;
+{
+    struct vimvar   *vp = &vimvars[VV_ERRORS];
+
+    if (vp->vv_type != VAR_LIST || vimvars[VV_ERRORS].vv_list == NULL)
+	/* Make sure v:errors is a list. */
+	set_vim_var_list(VV_ERRORS, list_alloc());
+    list_append_string(vimvars[VV_ERRORS].vv_list, gap->ga_data, gap->ga_len);
+}
+
+    static void
+prepareForAssertError(gap)
+    garray_T	*gap;
+{
+    char buf[NUMBUFLEN];
+
+    ga_init2(gap, 1, 100);
+    ga_concat(gap, sourcing_name);
+    sprintf(buf, " line %ld", (long)sourcing_lnum);
+    ga_concat(gap, (char_u *)buf);
+}
+
+/*
+ * "assertEqual(expected, actual[, msg])" function
+ */
+    static void
+f_assertEqual(argvars, rettv)
+    typval_T	*argvars;
+    typval_T	*rettv UNUSED;
+{
+    garray_T	ga;
+    char_u	*tofree;
+    char_u	numbuf[NUMBUFLEN];
+
+    if (!tv_equal(&argvars[0], &argvars[1], FALSE, FALSE))
+    {
+	prepareForAssertError(&ga);
+	ga_concat(&ga, (char_u *)": Expected ");
+	ga_concat(&ga, tv2string(&argvars[0], &tofree, numbuf, 0));
+	vim_free(tofree);
+	ga_concat(&ga, (char_u *)" but got ");
+	ga_concat(&ga, tv2string(&argvars[1], &tofree, numbuf, 0));
+	vim_free(tofree);
+	assertError(&ga);
+	ga_clear(&ga);
+    }
+}
+
+    static void
+assertBool(argvars, isTrue)
+    typval_T	*argvars;
+    int		isTrue;
+{
+    int		error = FALSE;
+    garray_T	ga;
+    char_u	*tofree;
+    char_u	numbuf[NUMBUFLEN];
+
+    if (argvars[0].v_type != VAR_NUMBER
+	    || (get_tv_number_chk(&argvars[0], &error) == 0) == isTrue
+	    || error)
+    {
+	prepareForAssertError(&ga);
+	ga_concat(&ga, (char_u *)": Expected ");
+	if (isTrue)
+	    ga_concat(&ga, (char_u *)"True ");
+	else
+	    ga_concat(&ga, (char_u *)"False ");
+	ga_concat(&ga, (char_u *)"but got ");
+	ga_concat(&ga, tv2string(&argvars[0], &tofree, numbuf, 0));
+	vim_free(tofree);
+	assertError(&ga);
+	ga_clear(&ga);
+    }
+}
+
+/*
+ * "assertFalse(actual[, msg])" function
+ */
+    static void
+f_assertFalse(argvars, rettv)
+    typval_T	*argvars;
+    typval_T	*rettv UNUSED;
+{
+    assertBool(argvars, FALSE);
+}
+
+/*
+ * "assertTrue(actual[, msg])" function
+ */
+    static void
+f_assertTrue(argvars, rettv)
+    typval_T	*argvars;
+    typval_T	*rettv UNUSED;
+{
+    assertBool(argvars, TRUE);
+}
+
 #ifdef FEAT_FLOAT
 /*
  * "asin()" function
diff --git a/src/misc2.c b/src/misc2.c
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2092,6 +2092,7 @@ ga_concat_strings(gap, sep)
 
 /*
  * Concatenate a string to a growarray which contains characters.
+ * When "s" is NULL does not do anything.
  * Note: Does NOT copy the NUL at the end!
  */
     void
@@ -2099,8 +2100,11 @@ ga_concat(gap, s)
     garray_T	*gap;
     char_u	*s;
 {
-    int    len = (int)STRLEN(s);
-
+    int    len;
+
+    if (s == NULL)
+	return;
+    len = (int)STRLEN(s);
     if (ga_grow(gap, len) == OK)
     {
 	mch_memmove((char *)gap->ga_data + gap->ga_len, s, (size_t)len);
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -68,15 +68,17 @@ SCRIPTS = test1.out test2.out test3.out 
 		test_utf8.out \
 		test_writefile.out
 
+NEW_TESTS = test_assert.res
+
 SCRIPTS_GUI = test16.out
 
 SCRIPTS_BENCH = bench_re_freeze.out
 
-.SUFFIXES: .in .out
+.SUFFIXES: .in .out .res .vim
 
-nongui:	nolog $(SCRIPTS) report
+nongui:	nolog $(SCRIPTS) newtests report
 
-gui:	nolog $(SCRIPTS) $(SCRIPTS_GUI) report
+gui:	nolog $(SCRIPTS) $(SCRIPTS_GUI) newtests report
 
 benchmark: $(SCRIPTS_BENCH)
 
@@ -95,7 +97,7 @@ RM_ON_START = tiny.vim small.vim mbyte.v
 RUN_VIM = VIMRUNTIME=$(SCRIPTSOURCE); export VIMRUNTIME; $(VALGRIND) $(VIMPROG) -u unix.vim -U NONE --noplugin -s dotest.in
 
 clean:
-	-rm -rf *.out *.failed *.rej *.orig test.log $(RM_ON_RUN) $(RM_ON_START) valgrind.*
+	-rm -rf *.out *.failed *.res *.rej *.orig test.log $(RM_ON_RUN) $(RM_ON_START) valgrind.*
 
 test1.out: test1.in
 	-rm -rf $*.failed $(RM_ON_RUN) $(RM_ON_START) wrongtermsize
@@ -157,3 +159,14 @@ bench_re_freeze.out: bench_re_freeze.vim
 
 nolog:
 	-rm -f test.log
+
+
+# New style of tests uses Vim script with assert calls.  These are easier
+# to write and a lot easier to read and debug.
+# Limitation: Only works with the +eval feature.
+RUN_VIMTEST = VIMRUNTIME=$(SCRIPTSOURCE); export VIMRUNTIME; $(VALGRIND) $(VIMPROG) -u unix.vim -U NONE --noplugin
+
+newtests: $(NEW_TESTS)
+
+.vim.res:
+	$(RUN_VIMTEST) -u runtest.vim $*.vim
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
new file mode 100644
--- /dev/null
+++ b/src/testdir/runtest.vim
@@ -0,0 +1,97 @@
+" This script is sourced while editing the .vim file with the tests.
+" When the script is successful the .res file will be created.
+" Errors are appended to the test.log file.
+"
+" The test script may contain anything, only functions that start with
+" "Test_" are special.  These will be invoked and should contain assert
+" functions.  See test_assert.vim for an example.
+"
+" It is possible to source other files that contain "Test_" functions.  This
+" can speed up testing, since Vim does not need to restart.  But be careful
+" that the tests do not interfere with each other.
+"
+" If an error cannot be detected properly with an assert function add the
+" error to the v:errors list:
+"   call add(v:errors, 'test foo failed: Cannot find xyz')
+"
+" If preparation for each Test_ function is needed, define a SetUp function.
+" It will be called before each Test_ function.
+"
+" If cleanup after each Test_ function is needed, define a TearDown function.
+" It will be called after each Test_ function.
+
+" Without the +eval feature we can't run these tests, bail out.
+if 0
+  quit!
+endif
+
+" Check that the screen size is at least 24 x 80 characters.
+if &lines < 24 || &columns < 80 
+  let error = 'Screen size too small! Tests require at least 24 lines with 80 characters'
+  echoerr error
+  split test.log
+  $put =error
+  w
+  cquit
+endif
+
+" Source the test script.  First grab the file name, in case the script
+" navigates away.
+let testname = expand('%')
+source %
+
+" Locate Test_ functions and execute them.
+redir @q
+function /^Test_
+redir END
+let tests = split(substitute(@q, 'function \(\k*()\)', '\1', 'g'))
+
+let done = 0
+let fail = 0
+let errors = []
+for test in tests
+  if exists("*SetUp")
+    call SetUp()
+  endif
+
+  let done += 1
+  try
+    exe 'call ' . test
+  catch
+    let fail += 1
+    call add(v:errors, 'Caught exception in ' . test . ': ' . v:exception . ' @ ' . v:throwpoint)
+  endtry
+
+  if len(v:errors) > 0
+    let fail += 1
+    call add(errors, 'Found errors in ' . test . ':')
+    call extend(errors, v:errors)
+    let v:errors = []
+  endif
+
+  if exists("*TearDown")
+    call TearDown()
+  endif
+endfor
+
+if fail == 0
+  " Success, create the .res file so that make knows it's done.
+  split %:r.res
+  write
+endif
+
+if len(errors) > 0
+  " Append errors to test.log
+  split test.log
+  call append(line('$'), '')
+  call append(line('$'), 'From ' . testname . ':')
+  call append(line('$'), errors)
+  write
+endif
+
+echo 'Executed ' . done . (done > 1 ? ' tests': ' test')
+if fail > 0
+  echo fail . ' FAILED'
+endif
+
+qall!
diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
new file mode 100644
--- /dev/null
+++ b/src/testdir/test_assert.vim
@@ -0,0 +1,19 @@
+" Test that the methods used for testing work.
+
+func Test_assertFalse()
+  call assertFalse(0)
+endfunc
+
+func Test_assertTrue()
+  call assertTrue(1)
+  call assertTrue(123)
+endfunc
+
+func Test_assertEqual()
+  let s = 'foo'
+  call assertEqual('foo', s)
+  let n = 4
+  call assertEqual(4, n)
+  let l = [1, 2, 3]
+  call assertEqual([1, 2, 3], l)
+endfunc
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    944,
+/**/
     943,
 /**/
     942,
diff --git a/src/vim.h b/src/vim.h
--- a/src/vim.h
+++ b/src/vim.h
@@ -1902,7 +1902,8 @@ typedef int proftime_T;	    /* dummy for
 #define VV_OPTION_NEW   59
 #define VV_OPTION_OLD   60
 #define VV_OPTION_TYPE  61
-#define VV_LEN		62	/* number of v: vars */
+#define VV_ERRORS	62
+#define VV_LEN		63	/* number of v: vars */
 
 #ifdef FEAT_CLIPBOARD