feat(test): format user code output (#14271)

This commit changes "deno test" to better denote user output coming
from test cases.

This is done by printing "---- output ----" and "---- output end ----"
markers if an output is produced. The output from "console" and
"Deno.core.print" is captured, as well as direct writes to "Deno.stdout"
and "Deno.stderr".

To achieve that new APIs were added to "deno_core" crate, that allow
to replace an existing resource with a different one (while keeping resource
ids intact). Resources for stdout and stderr are replaced by pipes.

Co-authored-by: David Sherret <dsherret@gmail.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/cli/tests/testdata/test/steps/output_within.out b/cli/tests/testdata/test/steps/output_within.out
new file mode 100644
index 000000000..b8610d903
--- /dev/null
+++ b/cli/tests/testdata/test/steps/output_within.out
@@ -0,0 +1,31 @@
+[WILDCARD]
+running 1 test from test/steps/output_within.ts
+description ...
+------- output -------
+1
+----- output end -----
+  step 1 ...
+------- output -------
+2
+----- output end -----
+    inner 1 ...
+------- output -------
+3
+----- output end -----
+    ok ([WILDCARD]ms)
+    inner 2 ...
+------- output -------
+4
+----- output end -----
+    ok ([WILDCARD]ms)
+
+------- output -------
+5
+----- output end -----
+  ok ([WILDCARD]ms)
+
+------- output -------
+6
+----- output end -----
+ok ([WILDCARD]ms)
+[WILDCARD]
diff --git a/cli/tests/testdata/test/steps/output_within.ts b/cli/tests/testdata/test/steps/output_within.ts
new file mode 100644
index 000000000..d3438a8ad
--- /dev/null
+++ b/cli/tests/testdata/test/steps/output_within.ts
@@ -0,0 +1,15 @@
+Deno.test("description", async (t) => {
+  // the output is not great, but this is an extreme scenario
+  console.log(1);
+  await t.step("step 1", async (t) => {
+    console.log(2);
+    await t.step("inner 1", () => {
+      console.log(3);
+    });
+    await t.step("inner 2", () => {
+      console.log(4);
+    });
+    console.log(5);
+  });
+  console.log(6);
+});