testing: escapes framing markers

Uses `^[` to escape the framing marker `^V` used to delimit test output. A test
that itself executes a go test binary, or otherwise emits that control
character, previously would corrupt the test2json parse of the enclosing run.

Updates #62728.

Change-Id: I0e8790a05fd7af469cd7ee2e8ccc13786cc372dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/751940
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Matloob <matloob@google.com>
Reviewed-by: Damien Neil <dneil@google.com>

2 files changed, 137 insertions, 0 deletions

diff --git a/src/cmd/internal/test2json/testdata/frameescape.json b/src/cmd/internal/test2json/testdata/frameescape.json
new file mode 100644
index 0000000000..c959089b92
--- /dev/null
+++ b/src/cmd/internal/test2json/testdata/frameescape.json
@@ -0,0 +1,137 @@
+{"Action":"start"}
+{"Action":"run","Test":"TestAscii"}
+{"Action":"output","Test":"TestAscii","Output":"=== RUN   TestAscii\n"}
+{"Action":"run","Test":"TestAscii/Log"}
+{"Action":"output","Test":"TestAscii/Log","Output":"=== RUN   TestAscii/Log\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0000\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0001\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0002\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0003\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0004\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0005\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0006\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0007\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \b\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \t\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"        \n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u000b\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \f\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \r\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u000e\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u000f\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0010\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0011\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0012\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0013\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0014\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0015\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0016\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0017\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0018\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0019\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001a\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001b\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001c\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001d\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001e\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u001f\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8:  \n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: !\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \"\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: #\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: $\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: %\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u0026\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: '\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: (\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: )\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: *\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: +\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ,\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: -\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: .\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: /\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 0\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 1\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 2\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 3\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 4\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 5\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 6\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 7\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 8\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: 9\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: :\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ;\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u003c\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: =\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \u003e\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ?\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: @\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: A\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: B\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: C\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: D\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: E\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: F\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: G\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: H\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: I\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: J\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: K\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: L\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: M\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: N\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: O\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: P\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: Q\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: R\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: S\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: T\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: U\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: V\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: W\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: X\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: Y\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: Z\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: [\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \\\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ]\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ^\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: _\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: `\n"}
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+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: b\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: c\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: d\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: e\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: f\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: g\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: h\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: i\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: j\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: k\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: l\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: m\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: n\n"}
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+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: q\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: r\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: s\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: t\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: u\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: v\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: w\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: x\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: y\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: z\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: {\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: |\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: }\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: ~\n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"    x_test.go:8: \n"}
+{"Action":"output","Test":"TestAscii/Log","Output":"--- PASS: TestAscii/Log (0.00s)\n"}
+{"Action":"pass","Test":"TestAscii/Log"}
+{"Action":"output","Test":"TestAscii","Output":"--- PASS: TestAscii (0.00s)\n"}
diff --git a/src/cmd/internal/test2json/testdata/frameescape.test b/src/cmd/internal/test2json/testdata/frameescape.test
new file mode 100644
index 0000000000..46abdfe1ea
--- /dev/null
+++ b/src/cmd/internal/test2json/testdata/frameescape.test