Create Bazel coverage report action.

Fixes #5246

RELNOTES: None.
PiperOrigin-RevId: 203453340

1 files changed, 88 insertions, 0 deletions

diff --git a/src/test/shell/bazel/bazel_coverage_test.sh b/src/test/shell/bazel/bazel_coverage_test.sh
index 41a51a65cf..8235f7cf79 100755
--- a/src/test/shell/bazel/bazel_coverage_test.sh
+++ b/src/test/shell/bazel/bazel_coverage_test.sh
@@ -232,6 +232,94 @@ EOF
   fi
 }
 
+function test_java_test_coverage_combined_report() {
+
+  cat <<EOF > BUILD
+java_test(
+    name = "test",
+    srcs = glob(["src/test/**/*.java"]),
+    test_class = "com.example.TestCollatz",
+    deps = [":collatz-lib"],
+)
+
+java_library(
+    name = "collatz-lib",
+    srcs = glob(["src/main/**/*.java"]),
+)
+EOF
+
+  mkdir -p src/main/com/example
+  cat <<EOF > src/main/com/example/Collatz.java
+package com.example;
+
+public class Collatz {
+
+  public static int getCollatzFinal(int n) {
+    if (n == 1) {
+      return 1;
+    }
+    if (n % 2 == 0) {
+      return getCollatzFinal(n / 2);
+    } else {
+      return getCollatzFinal(n * 3 + 1);
+    }
+  }
+
+}
+EOF
+
+  mkdir -p src/test/com/example
+  cat <<EOF > src/test/com/example/TestCollatz.java
+package com.example;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+public class TestCollatz {
+
+  @Test
+  public void testGetCollatzFinal() {
+    assertEquals(Collatz.getCollatzFinal(1), 1);
+    assertEquals(Collatz.getCollatzFinal(5), 1);
+    assertEquals(Collatz.getCollatzFinal(10), 1);
+    assertEquals(Collatz.getCollatzFinal(21), 1);
+  }
+
+}
+EOF
+
+  bazel coverage //:test --coverage_report_generator=@bazel_tools//tools/test/LcovMerger/java/com/google/devtools/lcovmerger:Main --combined_report=lcov &>$TEST_log \
+   || echo "Coverage for //:test failed"
+
+  cat <<EOF > result.dat
+SF:com/example/Collatz.java
+FN:3,com/example/Collatz::<init> ()V
+FN:6,com/example/Collatz::getCollatzFinal (I)I
+FNDA:0,com/example/Collatz::<init> ()V
+FNDA:1,com/example/Collatz::getCollatzFinal (I)I
+FNF:2
+FNH:1
+BA:6,2
+BA:9,2
+BRF:2
+BRH:2
+DA:3,0
+DA:6,3
+DA:7,2
+DA:9,4
+DA:10,5
+DA:12,7
+LH:5
+LF:6
+end_of_record
+EOF
+
+  if ! cmp result.dat ./bazel-out/_coverage/_coverage_report.dat; then
+    diff result.dat bazel-out/_coverage/_coverage_report.dat >> $TEST_log
+    fail "Coverage output file is different with expected"
+  fi
+}
+
 function test_java_test_java_import_coverage() {
 
   cat <<EOF > BUILD