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>

1 files changed, 7 insertions, 3 deletions

diff --git a/cli/tools/test_runner.rs b/cli/tools/test_runner.rs
index 432935aef..733a3edd5 100644
--- a/cli/tools/test_runner.rs
+++ b/cli/tools/test_runner.rs
@@ -340,7 +340,7 @@ pub async fn run_tests(
   doc_modules: Vec<ModuleSpecifier>,
   test_modules: Vec<ModuleSpecifier>,
   no_run: bool,
-  fail_fast: bool,
+  fail_fast: Option<usize>,
   quiet: bool,
   allow_none: bool,
   filter: Option<String>,
@@ -515,6 +515,7 @@ pub async fn run_tests(
       let mut has_error = false;
       let mut planned = 0;
       let mut reported = 0;
+      let mut failed = 0;
 
       for event in receiver.iter() {
         match event.message.clone() {
@@ -538,6 +539,7 @@ pub async fn run_tests(
 
             if let TestResult::Failed(_) = result {
               has_error = true;
+              failed += 1;
             }
           }
           _ => {}
@@ -545,8 +547,10 @@ pub async fn run_tests(
 
         reporter.visit_event(event);
 
-        if has_error && fail_fast {
-          break;
+        if let Some(x) = fail_fast {
+          if failed >= x {
+            break;
+          }
         }
       }