Rename tests from `*.spire` to `*.slang`

Many of the existing test cases were being skipped on accident, because their file names used `.spire` and the test tool was now looking for `.slang`

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/diagnostics/undefined-identifier.slang b/tests/diagnostics/undefined-identifier.slang
new file mode 100644
index 000000000..6c5a59f75
--- /dev/null
+++ b/tests/diagnostics/undefined-identifier.slang
@@ -0,0 +1,7 @@
+//TEST:SIMPLE:
+// use of undefined identifier
+
+void foo()
+{
+	int a = b;
+}