test: add JSON and JSON Lines output test cases

Author: kurok

Makefile.am

@@ -132,7 +132,9 @@ DIALECT_NEUTRAL_TESTS = tests/case-00-hello.bash \
 	tests/case-20-offset-field.bash \
 	tests/case-20-repeat-count.bash \
 	tests/case-21-exit-Q-status.bash \
-	tests/case-22-empty-process-name.bash
+	tests/case-22-empty-process-name.bash \
+	tests/case-30-json-output.bash \
+	tests/case-31-jsonl-output.bash
 TESTS = $(DIALECT_NEUTRAL_TESTS)
 EXTRA_DIST += $(DIALECT_NEUTRAL_TESTS) \
 	tests/case-13-classic.bash \

tests/case-30-json-output.bash

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+source tests/common.bash
+
+# Skip if python3 not available (needed for JSON validation)
+if ! command -v python3 &>/dev/null; then
+    echo "SKIP: python3 not available" >> $report
+    exit 77
+fi
+
+{
+    # Test 1: -J produces valid JSON
+    output=$($lsof -J -p $$ 2>/dev/null)
+    if ! echo "$output" | python3 -m json.tool > /dev/null 2>&1; then
+        echo "FAIL: -J output is not valid JSON" >> $report
+        exit 1
+    fi
+    echo "PASS: -J produces valid JSON" >> $report
+
+    # Test 2: -J output has lsof_version and processes keys
+    echo "$output" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+assert 'lsof_version' in d, 'missing lsof_version'
+assert 'processes' in d, 'missing processes'
+assert isinstance(d['processes'], list), 'processes is not a list'
+assert len(d['processes']) > 0, 'no processes found'
+" 2>&1 || { echo "FAIL: -J output structure invalid" >> $report; exit 1; }
+    echo "PASS: -J output structure valid" >> $report
+
+    # Test 3: -J -Fpcfn only includes selected fields
+    output_sel=$($lsof -J -Fpcfn -p $$ 2>/dev/null)
+    echo "$output_sel" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+p = d['processes'][0]
+assert 'pid' in p, 'missing pid'
+assert 'command' in p, 'missing command'
+f = p['files'][0]
+allowed_file_keys = {'fd', 'name'}
+actual_file_keys = set(f.keys())
+extra_keys = actual_file_keys - allowed_file_keys
+assert not extra_keys, 'unexpected file keys with -Fpcfn: %s' % extra_keys
+assert 'uid' not in p, 'uid should not be present with -Fpcfn'
+" 2>&1 || { echo "FAIL: -J field selection not working" >> $report; exit 1; }
+    echo "PASS: -J field selection works" >> $report
+
+    # Test 4: -J empty result produces valid JSON
+    output_empty=$($lsof -J -p 999999 2>/dev/null)
+    echo "$output_empty" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+assert d['processes'] == [], 'empty result should have empty processes array'
+" 2>&1 || { echo "FAIL: -J empty result is not valid JSON" >> $report; exit 1; }
+    echo "PASS: -J empty result is valid JSON" >> $report
+
+    # Test 5: -J and -j are mutually exclusive
+    if $lsof -J -j 2>/dev/null; then
+        echo "FAIL: -J -j should error" >> $report
+        exit 1
+    fi
+    echo "PASS: -J -j mutual exclusivity" >> $report
+
+    # Test 6: -J and -t are mutually exclusive
+    if $lsof -J -t 2>/dev/null; then
+        echo "FAIL: -J -t should error" >> $report
+        exit 1
+    fi
+    echo "PASS: -J -t mutual exclusivity" >> $report
+
+    exit 0
+} > $report 2>&1

tests/case-31-jsonl-output.bash

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+source tests/common.bash
+
+# Skip if python3 not available
+if ! command -v python3 &>/dev/null; then
+    echo "SKIP: python3 not available" >> $report
+    exit 77
+fi
+
+{
+    # Test 1: -j produces valid JSON Lines (each line is valid JSON)
+    tmpout=$(mktemp)
+    $lsof -j -p $$ 2>/dev/null > "$tmpout"
+    fail=0
+    while IFS= read -r line; do
+        if [ -z "$line" ]; then
+            continue
+        fi
+        if ! echo "$line" | python3 -m json.tool > /dev/null 2>&1; then
+            echo "FAIL: -j line is not valid JSON: $line" >> $report
+            fail=1
+            break
+        fi
+    done < "$tmpout"
+    rm -f "$tmpout"
+    if [ $fail -ne 0 ]; then
+        exit 1
+    fi
+    echo "PASS: -j produces valid JSON Lines" >> $report
+
+    # Test 2: -j lines contain both process and file fields (denormalized)
+    line=$($lsof -j -p $$ 2>/dev/null | head -1)
+    echo "$line" | python3 -c "
+import sys, json
+d = json.load(sys.stdin)
+assert 'pid' in d, 'missing pid'
+assert 'fd' in d or 'command' in d, 'missing file or process fields'
+" 2>&1 || { echo "FAIL: -j line missing expected fields" >> $report; exit 1; }
+    echo "PASS: -j lines have denormalized fields" >> $report
+
+    # Test 3: -j with no matching process produces empty output
+    output=$($lsof -j -p 999999 2>/dev/null)
+    if [ -n "$output" ]; then
+        echo "FAIL: -j with no matches should produce empty output" >> $report
+        exit 1
+    fi
+    echo "PASS: -j empty result is empty" >> $report
+
+    exit 0
+} > $report 2>&1