tests: runtime_shell: test additional dry-run validation

This adds a runtime_shell test that runs fluent-bit in dry-run mode and
ensures we are running the additional validation recently added.
Specifically, we test that configuration property validation is
happening, which is borrowed from the hot reload code and was not
previously used for dry-run validation.

Author: ahayworth

tests/runtime_shell/dry_run_invalid_property.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+
+# Setup environment if not already set
+if [ -z "$FLB_BIN" ]; then
+    FLB_ROOT=${FLB_ROOT:-$(cd $(dirname $0)/../.. && pwd)}
+    FLB_BIN=${FLB_BIN:-$FLB_ROOT/build/bin/fluent-bit}
+fi
+
+echo "Using Fluent Bit at: $FLB_BIN"
+
+# Create a temporary YAML config file with an invalid property
+cat > /tmp/dry_run_invalid_property.yaml << EOL
+service:
+  log_level: debug
+  flush: 1
+pipeline:
+  inputs:
+    - name: dummy
+      tag: test
+      invalid_property_that_does_not_exist: some_value
+  outputs:
+    - name: stdout
+      match: '*'
+EOL
+
+echo "Running Fluent Bit with --dry-run and invalid property config..."
+echo "YAML Config:"
+cat /tmp/dry_run_invalid_property.yaml
+
+# Redirect stdout and stderr to a file for analysis
+OUTPUT_FILE="/tmp/dry_run_invalid_property_output.txt"
+$FLB_BIN --dry-run -c /tmp/dry_run_invalid_property.yaml > $OUTPUT_FILE 2>&1
+
+# Check exit code - we expect it to fail
+EXIT_CODE=$?
+echo "Fluent Bit --dry-run exited with code: $EXIT_CODE"
+
+# Show the output
+echo "Output file content:"
+cat $OUTPUT_FILE
+
+# Check if the output contains an error about the unknown configuration property
+UNKNOWN_PROPERTY=$(grep -c "unknown configuration property 'invalid_property_that_does_not_exist'" $OUTPUT_FILE || true)
+RELOAD_ERROR=$(grep -c "check properties for input plugins is failed" $OUTPUT_FILE || true)
+
+# Clean up
+echo "Cleaning up..."
+rm -f /tmp/dry_run_invalid_property.yaml
+rm -f $OUTPUT_FILE
+
+# Check results - we expect:
+# 1. Fluent Bit to fail (non-zero exit code)
+# 2. Error message about unknown configuration property
+# 3. Error message from reload validation
+if [ "$EXIT_CODE" -ne 0 ] && [ "$UNKNOWN_PROPERTY" -gt 0 ] && [ "$RELOAD_ERROR" -gt 0 ]; then
+    echo "Test passed: Fluent Bit --dry-run correctly detected invalid property and failed"
+    exit 0
+else
+    echo "Test failed: Fluent Bit --dry-run should detect invalid properties and fail"
+    echo "Exit code: $EXIT_CODE (expected non-zero)"
+    echo "Unknown property message count: $UNKNOWN_PROPERTY (expected > 0)"
+    echo "Reload error message count: $RELOAD_ERROR (expected > 0)"
+    exit 1
+fi