adding script to compile all specimin output

check_compilation.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# This script runs javac on all of the expected test outputs under src/test/resources.
+# It returns 2 if any of them fail to compile, 1 if there are any malformed test directories,
+# and 0 if all of them do compile.
+#
+# It is desirable that all of the expected test outputs compile, because Specimin
+# should produce independently-compilable programs.
+
+returnval=0
+
+cd ISSUES || exit 1
+for target in * ; do
+    echo "Target = ${target}"
+    if [ "${target}" = "output.html" ] || [ "${target}" = "target_status.json" ] ||  [ "${target}" = "specimin" ]; then 
+        continue; 
+    fi
+
+    cd "${target}/output/" || exit 1
+    # check if any directory exists inside output. If no directory there, specimin failed on the input target
+    # in that case, ignoring it.
+    directory_count="$(find ./ -mindepth 1 -type d | wc -l)"
+    if [ "$directory_count" -eq 0 ]; then 
+        echo "No directories inside ${target}/output. Ignoring it."
+        cd ../..
+        continue
+    fi
+
+    echo "Running javac on ${target}/output"
+    # javac relies on word splitting
+    # shellcheck disable=SC2046
+    javac -classpath "../../../resources/checker-qual-3.42.0.jar" $(find . -name "*.java") \
+      || { echo "Running javac on ${target}/expected issues one or more errors, which are printed above."; returnval=2; }
+    cd ../.. || exit 1
+done
+
+if [ "${returnval}" = 0 ]; then
+  echo "All expected test outputs compiled successfully."
+elif [ "${returnval}" = 2 ]; then
+  echo "Some expected test outputs do not compile successfully. See the above error output for details."
+fi
+
+find . -name "*.class" -exec rm {} \;
+
+exit ${returnval}