libtest: Print the names of failed tests eagerly

Previously, libtest would wait until all tests finished running to print the progress, which made it
annoying to run many tests at once (since you don't know which have failed). Change it to print the
names as soon as they fail.

This also adds a test for the terse output; previously it was untested.

2 files changed, 156 insertions, 0 deletions

diff --git a/tests/ui/test-attrs/terse.rs b/tests/ui/test-attrs/terse.rs
new file mode 100644
index 00000000000..ab9d5cc19bd
--- /dev/null
+++ b/tests/ui/test-attrs/terse.rs
@@ -0,0 +1,125 @@
+//@ compile-flags: --test
+//@ run-fail
+//@ run-flags: --test-threads=1 --quiet
+//@ check-run-results
+//@ exec-env:RUST_BACKTRACE=0
+//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ ignore-emscripten no threads support
+//@ needs-unwind
+
+#[test]
+fn abc() {
+    panic!();
+}
+
+#[test]
+fn foo() {
+    panic!();
+}
+
+#[test]
+fn foo2() {
+    panic!();
+}
+
+// run a whole bunch of tests so we can see what happens when we go over 88 columns
+#[test] fn f0() {}
+#[test] fn f1() {}
+#[test] fn f2() {}
+#[test] fn f3() {}
+#[test] fn f4() {}
+#[test] fn f5() {}
+#[test] fn f6() {}
+#[test] fn f7() {}
+#[test] fn f8() {}
+#[test] fn f9() {}
+#[test] fn f10() {}
+#[test] fn f11() {}
+#[test] fn f12() {}
+#[test] fn f13() {}
+#[test] fn f14() {}
+#[test] fn f15() {}
+#[test] fn f16() {}
+#[test] fn f17() {}
+#[test] fn f18() {}
+#[test] fn f19() {}
+#[test] fn f20() {}
+#[test] fn f21() {}
+#[test] fn f22() {}
+#[test] fn f23() {}
+#[test] fn f24() {}
+#[test] fn f25() {}
+#[test] fn f26() {}
+#[test] fn f27() {}
+#[test] fn f28() {}
+#[test] fn f29() {}
+#[test] fn f30() {}
+#[test] fn f31() {}
+#[test] fn f32() {}
+#[test] fn f33() {}
+#[test] fn f34() {}
+#[test] fn f35() {}
+#[test] fn f36() {}
+#[test] fn f37() {}
+#[test] fn f38() {}
+#[test] fn f39() {}
+#[test] fn f40() {}
+#[test] fn f41() {}
+#[test] fn f42() {}
+#[test] fn f43() {}
+#[test] fn f44() {}
+#[test] fn f45() {}
+#[test] fn f46() {}
+#[test] fn f47() {}
+#[test] fn f48() {}
+#[test] fn f49() {}
+#[test] fn f50() {}
+#[test] fn f51() {}
+#[test] fn f52() {}
+#[test] fn f53() {}
+#[test] fn f54() {}
+#[test] fn f55() {}
+#[test] fn f56() {}
+#[test] fn f57() {}
+#[test] fn f58() {}
+#[test] fn f59() {}
+#[test] fn f60() {}
+#[test] fn f61() {}
+#[test] fn f62() {}
+#[test] fn f63() {}
+#[test] fn f64() {}
+#[test] fn f65() {}
+#[test] fn f66() {}
+#[test] fn f67() {}
+#[test] fn f68() {}
+#[test] fn f69() {}
+#[test] fn f70() {}
+#[test] fn f71() {}
+#[test] fn f72() {}
+#[test] fn f73() {}
+#[test] fn f74() {}
+#[test] fn f75() {}
+#[test] fn f76() {}
+#[test] fn f77() {}
+#[test] fn f78() {}
+#[test] fn f79() {}
+#[test] fn f80() {}
+#[test] fn f81() {}
+#[test] fn f82() {}
+#[test] fn f83() {}
+#[test] fn f84() {}
+#[test] fn f85() {}
+#[test] fn f86() {}
+#[test] fn f87() {}
+#[test] fn f88() {}
+#[test] fn f89() {}
+#[test] fn f90() {}
+#[test] fn f91() {}
+#[test] fn f92() {}
+#[test] fn f93() {}
+#[test] fn f94() {}
+#[test] fn f95() {}
+#[test] fn f96() {}
+#[test] fn f97() {}
+#[test] fn f98() {}
+#[test] fn f99() {}
diff --git a/tests/ui/test-attrs/terse.run.stdout b/tests/ui/test-attrs/terse.run.stdout
new file mode 100644
index 00000000000..2b361361ae8
--- /dev/null
+++ b/tests/ui/test-attrs/terse.run.stdout
@@ -0,0 +1,31 @@
+
+running 103 tests
+abc --- FAILED
+....................................................................................... 88/103
+............. 101/103
+foo --- FAILED
+foo2 --- FAILED
+
+failures:
+
+---- abc stdout ----
+thread 'abc' panicked at $DIR/terse.rs:12:5:
+explicit panic
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+---- foo stdout ----
+thread 'foo' panicked at $DIR/terse.rs:17:5:
+explicit panic
+
+---- foo2 stdout ----
+thread 'foo2' panicked at $DIR/terse.rs:22:5:
+explicit panic
+
+
+failures:
+    abc
+    foo
+    foo2
+
+test result: FAILED. 100 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+