chore: add test case for "SCIPIndexer.cc:122 enforced condition !baseLoc.empty()" segfault

Signed-off-by: Emi <emi@sourcegraph.com>

Author: emidoots

test/scip/testdata/minitest_3.rb

@@ -11,6 +11,10 @@ def self.describe(name, &blk); end
   test_each([[1,2], [3,4]]) do |(a,b)|
 
     describe "d" do
+      # `before` inside `test_each` has a synthesized method name with an empty
+      # source location. The indexer should skip that definition occurrence.
+      before do
+      end
       it "b" do
         T.reveal_type(a) # error: Revealed type: `Integer`
       end

test/scip/testdata/minitest_3.snapshot.rb

@@ -31,6 +31,10 @@ def self.describe(name, &blk); end
 #                                   ^ definition local 2$416088458
 
      describe "d" do
+       # `before` inside `test_each` has a synthesized method name with an empty
+       # source location. The indexer should skip that definition occurrence.
+       before do
+       end
 #      ⌄ enclosing_range_start [..] Test#`<it 'b'>`().
        it "b" do
 #         ^^^ definition [..] Test#`<it 'b'>`().