Modify how tests are run to improve overall speed.

A Vader issue causes problems with the test results when using the
location list. Because of this the tests were modified to run 1 test
file per vim instance instead of running all tests in a single vim
instance. This resulted in signficant slow down in test execution time.
To speed up execution time only specific tests are run individually now.

test/Readme.md

@@ -50,3 +50,6 @@ plugin source files. For more information run `./run_tests.sh -h`.
    `Vim: Error reading input, exiting...`
     - Probably need to look into this more and determine if the issue is Vader,
       Neovim, or Docker.
+2. Vader does not play nice with the location list. Tests that use the location
+   list should be placed in `independent_runs/`.
+    - [Vader Issue #199](https://github.com/junegunn/vader.vim/issues/199)

test/independent_runs/search.vader

@@ -1,4 +1,4 @@
-Include: vader_includes/vader_setup.vader
+Include: vader_setup
 
 Execute (Setup search testing wrapper):
   function! TestSearch(search_command, test_name)
@@ -63,4 +63,4 @@ Execute (Search failure message):
   redir END
   Assert match(output, 'VimwikiSearch: No match found.') > -1, "expected custom error"
 
-Include: vader_includes/vader_teardown.vader
+Include: vader_teardown

test/independent_runs/vader_setup

@@ -0,0 +1 @@
+../vader_includes/vader_setup.vader

test/independent_runs/vader_teardown

@@ -0,0 +1 @@
+../vader_includes/vader_teardown.vader

test/run_tests.sh

@@ -36,11 +36,20 @@ runVader() {
         echo ""
         echo "Running version: $v"
         vim="/vim-build/bin/$v -u test/vimrc -i NONE"
-        test_cmd="for VF in test/*.vader; do $vim \"+Vader! \$VF\"; done"
+        test_cmd="for VF in test/independent_runs/*.vader; do $vim \"+Vader! \$VF\"; done"
+
         set -o pipefail
+
+        # tests that must be run in individual vim instances
+        # see README.md for more information
         docker run -a stderr -e VADER_OUTPUT_FILE=/dev/stderr "${flags[@]}" \
           /bin/bash -c "$test_cmd" 2>&1 | vader_filter | vader_color
+
+        # remaining tests
+        docker run -a stderr -e VADER_OUTPUT_FILE=/dev/stderr "${flags[@]}" \
+          "$v" -u test/vimrc -i NONE "+Vader! test/*" 2>&1 | vader_filter | vader_color
         set +o pipefail
+
     done
 }