add t.Output

Author: mxey

output_disabled.go

@@ -0,0 +1,9 @@
+//go:build !go1.25
+
+package rapid
+
+// Output is only available on Go 1.25+.
+func (t *T) Output() io.Writer {
+	t.Helper()
+	t.Fatalf("[rapid] Output requires Go 1.25 or newer")
+}

output_enabled.go

@@ -0,0 +1,24 @@
+//go:build go1.25
+
+package rapid
+
+import "io"
+
+// Output returns a Writer that writes to the same test output stream as T.Log.
+// The output is indented like T.Log lines, but Output does not
+// add source locations or newlines. The output is internally line
+// buffered, and a call to T.Log or the end of the test will implicitly
+// flush the buffer, followed by a newline. After a test function and all its
+// parents return, neither Output nor the Write method may be called.
+//
+// Only available on Go >= 1.25
+func (t *T) Output() io.Writer {
+	if t.rawLog != nil {
+		return t.rawLog.Writer()
+	} else if t.tbLog {
+		tout := t.tb.(interface{ Output() io.Writer })
+		return tout.Output()
+	} else {
+		return io.Discard
+	}
+}

output_enabled_test.go

@@ -0,0 +1,22 @@
+//go:build go1.25
+
+package rapid
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestOutputRawLog(t *testing.T) {
+	t.Parallel()
+
+	msg := []byte("Hello World")
+
+	out := captureTestOutput(t, func(t *T) {
+		t.Output().Write(msg)
+	}, nil)
+
+	if !bytes.Contains(out, msg) {
+		t.Errorf("expected output to contain %q, got: %q", msg, out)
+	}
+}