solc: Fixes double-quoting path names on stderr and adds tests for it.

Before it was possible to get a failure message, such as:

    ""notfound.sol"" is not found

whereas it should be:

    "notfound.sol" is not found.

2 files changed, 54 insertions, 4 deletions

diff --git a/solc/CommandLineInterface.cpp b/solc/CommandLineInterface.cpp
index 6a768a00..6dd8fac0 100644
--- a/solc/CommandLineInterface.cpp
+++ b/solc/CommandLineInterface.cpp
@@ -416,11 +416,11 @@ bool CommandLineInterface::readInputFilesAndConfigureRemappings()
 				{
 					if (!ignoreMissing)
 					{
-						cerr << "\"" << infile << "\" is not found" << endl;
+						cerr << infile << " is not found." << endl;
 						return false;
 					}
 					else
-						cerr << "\"" << infile << "\" is not found. Skipping." << endl;
+						cerr << infile << " is not found. Skipping." << endl;
 
 					continue;
 				}
@@ -429,11 +429,11 @@ bool CommandLineInterface::readInputFilesAndConfigureRemappings()
 				{
 					if (!ignoreMissing)
 					{
-						cerr << "\"" << infile << "\" is not a valid file" << endl;
+						cerr << infile << " is not a valid file." << endl;
 						return false;
 					}
 					else
-						cerr << "\"" << infile << "\" is not a valid file. Skipping." << endl;
+						cerr << infile << " is not a valid file. Skipping." << endl;
 
 					continue;
 				}
diff --git a/test/cmdlineTests.sh b/test/cmdlineTests.sh
index bc0ee786..a8e271d2 100755
--- a/test/cmdlineTests.sh
+++ b/test/cmdlineTests.sh
@@ -94,6 +94,56 @@ printTask "Testing unknown options..."
     fi
 )
 
+# General helper function for testing SOLC behaviour, based on file name, compile opts, exit code, stdout and stderr.
+# An failure is expected.
+test_solc_file_input_failures() {
+    local filename="${1}"
+    local solc_args="${2}"
+    local stdout_expected="${3}"
+    local stderr_expected="${4}"
+    local stdout_path=`mktemp`
+    local stderr_path=`mktemp`
+
+    set +e
+    "$SOLC" "${filename}" ${solc_args} 1>$stdout_path 2>$stderr_path
+    exitCode=$?
+    set -e
+
+    if [[ $exitCode -eq 0 ]]; then
+        printError "Incorrect exit code. Expected failure (non-zero) but got success (0)."
+        rm -f $stdout_path $stderr_path
+        exit 1
+    fi
+
+    if [[ "$(cat $stdout_path)" != "${stdout_expected}" ]]; then
+        printError "Incorrect output on stderr received. Expected:"
+        echo -e "${stdout_expected}"
+
+        printError "But got:"
+        cat $stdout_path
+        rm -f $stdout_path $stderr_path
+        exit 1
+    fi
+
+    if [[ "$(cat $stderr_path)" != "${stderr_expected}" ]]; then
+        printError "Incorrect output on stderr received. Expected:"
+        echo -e "${stderr_expected}"
+
+        printError "But got:"
+        cat $stderr_path
+        rm -f $stdout_path $stderr_path
+        exit 1
+    fi
+
+    rm -f $stdout_path $stderr_path
+}
+
+printTask "Testing passing files that are not found..."
+test_solc_file_input_failures "file_not_found.sol" "" "" "\"file_not_found.sol\" is not found."
+
+printTask "Testing passing files that are not files..."
+test_solc_file_input_failures "." "" "" "\".\" is not a valid file."
+
 printTask "Compiling various other contracts and libraries..."
 (
 cd "$REPO_ROOT"/test/compilationTests/