test(worker): add unit tests for php and swift workers

Extract testable logic from exec.mjs into lib.mjs (preprocessCode,
createIOCallbacks, buildResult) and add vitest tests. Add Go tests
for models, exec helpers, and handlers in worker/swift. Update
justfiles to include test tasks for local dev and CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/worker/swift/models_test.go b/worker/swift/models_test.go
new file mode 100644
index 0000000..62d6675
--- /dev/null
+++ b/worker/swift/models_test.go
@@ -0,0 +1,70 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+func TestExecRequestData_Validate(t *testing.T) {
+	tests := []struct {
+		name          string
+		maxDurationMs int
+		wantErr       error
+	}{
+		{"positive value", 1000, nil},
+		{"zero", 0, errInvalidMaxDuration},
+		{"negative value", -1, errInvalidMaxDuration},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := &execRequestData{MaxDurationMilliseconds: tt.maxDurationMs}
+			err := req.validate()
+			if err != tt.wantErr {
+				t.Errorf("validate() = %v, want %v", err, tt.wantErr)
+			}
+		})
+	}
+}
+
+func TestExecRequestData_MaxDuration(t *testing.T) {
+	tests := []struct {
+		name          string
+		maxDurationMs int
+		want          time.Duration
+	}{
+		{"1000ms", 1000, 1 * time.Second},
+		{"500ms", 500, 500 * time.Millisecond},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := &execRequestData{MaxDurationMilliseconds: tt.maxDurationMs}
+			got := req.maxDuration()
+			if got != tt.want {
+				t.Errorf("maxDuration() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestExecResponseData_Success(t *testing.T) {
+	tests := []struct {
+		name   string
+		status string
+		want   bool
+	}{
+		{"success", resultSuccess, true},
+		{"compile_error", resultCompileError, false},
+		{"runtime_error", resultRuntimeError, false},
+		{"timeout", resultTimeout, false},
+		{"internal_error", resultInternalError, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			res := &execResponseData{Status: tt.status}
+			got := res.success()
+			if got != tt.want {
+				t.Errorf("success() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}