test(hooks): skip the stdin-JSON hook test when jq is missing

pkg/hooks/helpers_other_test.go

@@ -3,6 +3,7 @@
 package hooks
 
 import (
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -31,7 +32,20 @@ func emitContextEnvPwdCmd(envVars ...string) string {
 
 // printStdinJSONFieldCmd returns a command printing one field of the JSON
 // document the hook receives on stdin.
-func printStdinJSONFieldCmd(field string) string {
+//
+// This is the only test helper that needs a JSON parser in the shell, and POSIX
+// has no built-in one (the Windows mirror can lean on PowerShell's
+// ConvertFrom-Json). It shells out to jq and skips when jq is absent.
+//
+// The skip matters: without it the hook still runs, produces no output, and the
+// test fails on its content assertion instead -- reporting `"" does not contain
+// "final answer content"`, which reads as a defect in the hook plumbing rather
+// than a missing tool on the machine.
+func printStdinJSONFieldCmd(t *testing.T, field string) string {
+	t.Helper()
+	if _, err := exec.LookPath("jq"); err != nil {
+		t.Skip("jq is not installed; it is required to read a JSON field from hook stdin")
+	}
 	return `cat | jq -r '.` + field + `'`
 }
 

pkg/hooks/helpers_windows_test.go

@@ -31,7 +31,11 @@ func emitContextEnvPwdCmd(envVars ...string) string {
 
 // printStdinJSONFieldCmd returns a command printing one field of the JSON
 // document the hook receives on stdin.
-func printStdinJSONFieldCmd(field string) string {
+// Signature mirrors the POSIX helper, which needs *testing.T to skip when jq is
+// missing. PowerShell's ConvertFrom-Json is built in, so there is nothing to
+// skip on here.
+func printStdinJSONFieldCmd(t *testing.T, field string) string {
+	t.Helper()
 	return `([Console]::In.ReadToEnd() | ConvertFrom-Json).` + field
 }
 

pkg/hooks/hooks_test.go

@@ -570,7 +570,7 @@ func TestExecuteStopReceivesResponseContent(t *testing.T) {
 
 	config := &Config{
 		Stop: []Hook{
-			{Type: HookTypeCommand, Command: printStdinJSONFieldCmd("stop_response"), Timeout: 5},
+			{Type: HookTypeCommand, Command: printStdinJSONFieldCmd(t, "stop_response"), Timeout: 5},
 		},
 	}