diff --git a/test/cmdlineTests.sh b/test/cmdlineTests.sh
index b320da05e..6adc91538 100755
--- a/test/cmdlineTests.sh
+++ b/test/cmdlineTests.sh
@@ -186,25 +186,25 @@ function test_solc_behaviour
     exitCode=$?
     set -e
 
-    if [[ " ${solc_args[*]} " == *" --standard-json "* ]]
+    if [[ " ${solc_args[*]} " == *" --standard-json "* ]] && [[ -s $stdout_path ]]
     then
         python3 - <<EOF
 import re, sys
 json = open("$stdout_path", "r").read()
 json = re.sub(r"{[^{}]*Warning: This is a pre-release compiler version[^{}]*},?", "", json)
-json = re.sub(r"\"errors\":\s*\[\s*\],?\s*","",json)    # Remove "errors" array if it's not empty
-json = re.sub("\n\\s+\n", "\n\n", json)                 # Remove trailing whitespace
-json = re.sub(r"},(\n{0,1})\n*(\s*])", r"}\1\2", json)  # },] -> }]
+json = re.sub(r"\"errors\":\s*\[\s*\],?","\n" if json[1] == " " else "",json)       # Remove "errors" array if it's not empty
+json = re.sub("\n\\s*\n", "\n", json)                                               # Remove trailing whitespace
+json = re.sub(r"},(\n{0,1})\n*(\s*(]|}))", r"}\1\2", json)                          # Remove trailing comma
 open("$stdout_path", "w").write(json)
 EOF
         sed -i.bak -E -e 's/ Consider adding \\"pragma solidity \^[0-9.]*;\\"//g' "$stdout_path"
-        sed -i.bak -E -e 's/\"opcodes\":\"[^"]+\"/\"opcodes\":\"<OPCODES REMOVED>\"/g' "$stdout_path"
-        sed -i.bak -E -e 's/\"sourceMap\":\"[0-9:;-]+\"/\"sourceMap\":\"<SOURCEMAP REMOVED>\"/g' "$stdout_path"
+        sed -i.bak -E -e 's/\"opcodes\":[[:space:]]*\"[^"]+\"/\"opcodes\":\"<OPCODES REMOVED>\"/g' "$stdout_path"
+        sed -i.bak -E -e 's/\"sourceMap\":[[:space:]]*\"[0-9:;-]+\"/\"sourceMap\":\"<SOURCEMAP REMOVED>\"/g' "$stdout_path"
 
         # Remove bytecode (but not linker references).
-        sed -i.bak -E -e 's/(\"object\":\")[0-9a-f]+([^"]*\")/\1<BYTECODE REMOVED>\2/g' "$stdout_path"
+        sed -i.bak -E -e 's/(\"object\":[[:space:]]*\")[0-9a-f]+([^"]*\")/\1<BYTECODE REMOVED>\2/g' "$stdout_path"
         # shellcheck disable=SC2016
-        sed -i.bak -E -e 's/(\"object\":\"[^"]+\$__)[0-9a-f]+(\")/\1<BYTECODE REMOVED>\2/g' "$stdout_path"
+        sed -i.bak -E -e 's/(\"object\":[[:space:]]*\"[^"]+\$__)[0-9a-f]+(\")/\1<BYTECODE REMOVED>\2/g' "$stdout_path"
         # shellcheck disable=SC2016
         sed -i.bak -E -e 's/([0-9a-f]{34}\$__)[0-9a-f]+(__\$[0-9a-f]{17})/\1<BYTECODE REMOVED>\2/g' "$stdout_path"
         # Remove metadata in assembly output (see below about the magic numbers)
@@ -215,7 +215,7 @@ EOF
         # Replace escaped newlines by actual newlines for readability
         # shellcheck disable=SC1003
         sed -i.bak -E -e 's/\\n/\'$'\n/g' "$stdout_path"
-        sed -i.bak -e 's/\(^[ ]*auxdata: \)0x[0-9a-f]*$/\1<AUXDATA REMOVED>/' "$stdout_path"
+        sed -i.bak -e 's/\(^[ ]*auxdata:[[:space:]]\)0x[0-9a-f]*$/\1<AUXDATA REMOVED>/' "$stdout_path"
         rm "$stdout_path.bak"
     else
         sed -i.bak -e '/^Warning: This is a pre-release compiler version, please do not use it in production./d' "$stderr_path"
@@ -458,7 +458,13 @@ printTask "Running general commandline tests..."
             inputFile=""
             stdout="$(cat "${tdir}/output.json" 2>/dev/null || true)"
             stdoutExpectationFile="${tdir}/output.json"
-            command_args="--standard-json "$(cat "${tdir}/args" 2>/dev/null || true)
+            prettyPrintFlags=""
+            if [[ ! -f "${tdir}/no-pretty-print" ]]
+            then
+                prettyPrintFlags="--pretty-json --json-indent 4"
+            fi
+
+            command_args="--standard-json ${prettyPrintFlags} "$(cat "${tdir}/args" 2>/dev/null || true)
         else
             if [ -e "${tdir}/stdin" ]
             then