Coverage support.

- open source CoverageCommand.java
- add a collect-coverage.sh script
- update test-setup.sh to be compatible with the coverage collector
- update StandaloneTestStrategy to provide the necessary env variables
- update StandaloneTestStrategy to set the right command line for coverage
- add support for C++ coverage

An HTML report can then be generated with genhtml like this:
genhtml -o report/ -p "$(readlink -f bazel-<project>)" path/to/coverage.dat

Progress on #1118.

--
MOS_MIGRATED_REVID=140125715

3 files changed, 9 insertions, 11 deletions

diff --git a/tools/test/BUILD b/tools/test/BUILD
index 846016ba8b..97438edda6 100644
--- a/tools/test/BUILD
+++ b/tools/test/BUILD
@@ -9,12 +9,12 @@ filegroup(
 
 filegroup(
     name = "coverage_support",
-    srcs = [],
+    srcs = ["//tools/coverage:coverage_support"],
 )
 
 filegroup(
     name = "coverage_report_generator",
-    srcs = ["dummy_coverage_report_generator"],
+    srcs = ["//tools/coverage:coverage_report_generator"],
 )
 
 filegroup(
diff --git a/tools/test/dummy_coverage_report_generator b/tools/test/dummy_coverage_report_generator
deleted file mode 100644
index 27c43ad8c2..0000000000
--- a/tools/test/dummy_coverage_report_generator
+++ /dev/null
@@ -1,2 +0,0 @@
-# Dummy file. Bazel requires there to be a single file in the coverage report
-# generator attribute, even though it's currently not used in Bazel.
diff --git a/tools/test/test-setup.sh b/tools/test/test-setup.sh
index c045f39144..14d7fd9a76 100755
--- a/tools/test/test-setup.sh
+++ b/tools/test/test-setup.sh
@@ -46,13 +46,12 @@ if [[ -n "${TEST_TOTAL_SHARDS+x}" ]] && ((TEST_TOTAL_SHARDS != 0)); then
 fi
 export GTEST_TMP_DIR="${TEST_TMPDIR}"
 
-DIR="$TEST_SRCDIR"
-RUNFILES_MANIFEST_FILE=$DIR/MANIFEST
+RUNFILES_MANIFEST_FILE="${TEST_SRCDIR}/MANIFEST"
 
 if [ -z "$RUNFILES_MANIFEST_ONLY" ]; then
   function rlocation() {
     if [[ "$1" = /* ]]; then
-      echo $1
+      echo "$1"
     else
       echo "$(dirname $RUNFILES_MANIFEST_FILE)/$1"
     fi
@@ -60,7 +59,7 @@ if [ -z "$RUNFILES_MANIFEST_ONLY" ]; then
 else
   function rlocation() {
     if [[ "$1" = /* ]]; then
-      echo $1
+      echo "$1"
     else
       echo $(grep "^$1 " $RUNFILES_MANIFEST_FILE | awk '{ print $2 }')
     fi
@@ -70,11 +69,11 @@ fi
 export -f rlocation
 export RUNFILES_MANIFEST_FILE
 
-if [ ! -z "$TEST_WORKSPACE" ]
-then
+DIR="$TEST_SRCDIR"
+if [ ! -z "$TEST_WORKSPACE" ]; then
   DIR="$DIR"/"$TEST_WORKSPACE"
 fi
-
+[[ -n "$RUNTEST_PRESERVE_CWD" ]] && DIR="$PWD"
 
 
 # normal commands are run in the exec-root where they have access to
@@ -100,6 +99,7 @@ if [[ "$TEST_NAME" = /* ]]; then
 else
   EXE="$(rlocation $TEST_WORKSPACE/$TEST_NAME)"
 fi
+[[ -n "$RUNTEST_PRESERVE_CWD" ]] && EXE="${TEST_NAME}"
 
 exitCode=0
 "${EXE}" "$@" || exitCode=$?