feat: Add support for "deno test --fail-fast=N" (#11316)

This commit adds support for specifying threshold in the "--fail-fast"
flag for "deno test" subcommand. Previously using "--fail-fast" stopped
running the test suite after first failure and with this change users
may specify number of failed tests that will cause the suite to be interrupted.

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/cli/tests/test/fail_fast_with_val.out b/cli/tests/test/fail_fast_with_val.out
new file mode 100644
index 000000000..a902e4c7b
--- /dev/null
+++ b/cli/tests/test/fail_fast_with_val.out
@@ -0,0 +1,23 @@
+[WILDCARD]
+running 10 tests from [WILDCARD]/test/fail_fast_with_val.ts
+test test 1 ... FAILED ([WILDCARD])
+test test 2 ... FAILED ([WILDCARD])
+
+failures:
+
+test 1
+Error
+    at [WILDCARD]/test/fail_fast_with_val.ts:2:9
+    at [WILDCARD]
+
+test 2
+Error
+    at [WILDCARD]/test/fail_fast_with_val.ts:5:9
+    at [WILDCARD]
+
+failures:
+
+	test 1
+	test 2
+
+test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out ([WILDCARD])
diff --git a/cli/tests/test/fail_fast_with_val.ts b/cli/tests/test/fail_fast_with_val.ts
new file mode 100644
index 000000000..637e825ec
--- /dev/null
+++ b/cli/tests/test/fail_fast_with_val.ts
@@ -0,0 +1,30 @@
+Deno.test("test 1", () => {
+  throw new Error();
+});
+Deno.test("test 2", () => {
+  throw new Error();
+});
+Deno.test("test 3", () => {
+  throw new Error();
+});
+Deno.test("test 4", () => {
+  throw new Error();
+});
+Deno.test("test 5", () => {
+  throw new Error();
+});
+Deno.test("test 6", () => {
+  throw new Error();
+});
+Deno.test("test 7", () => {
+  throw new Error();
+});
+Deno.test("test 8", () => {
+  throw new Error();
+});
+Deno.test("test 9", () => {
+  throw new Error();
+});
+Deno.test("test 0", () => {
+  throw new Error();
+});