feat(cli/tools/test_runner): add terse reporter (#11156)

This commit adds "--terse" flag to "deno test" that makes testing reporter
output one character per test case instead of one line per case.

This is an unstable feature.

2 files changed, 22 insertions, 0 deletions

diff --git a/cli/tests/test/terse.out b/cli/tests/test/terse.out
new file mode 100644
index 000000000..3d5deaf39
--- /dev/null
+++ b/cli/tests/test/terse.out
@@ -0,0 +1,11 @@
+Check [WILDCARD]/test/terse.ts
+running 3 tests from [WILDCARD]
+.Fi
+failures:
+
+fail
+Error: fail
+    [WILDCARD]
+
+test result: FAILED. 1 passed; 1 failed; 1 ignored; 0 measured; 0 filtered out [WILDCARD]
+
diff --git a/cli/tests/test/terse.ts b/cli/tests/test/terse.ts
new file mode 100644
index 000000000..b2168a0d9
--- /dev/null
+++ b/cli/tests/test/terse.ts
@@ -0,0 +1,11 @@
+Deno.test("ok", function () {});
+
+Deno.test("fail", function () {
+  throw new Error("fail");
+});
+
+Deno.test({
+  name: "ignore",
+  fn() {},
+  ignore: true,
+});