preprocess: Add tests for vars, quotes in names

This is in anticipation of refactoring away the `$(eval echo
"$quoted_name")` command substitution.

test/bats.bats

@@ -268,3 +268,17 @@ fixtures bats
   [ $status -eq 0 ]
   [ "${lines[1]}" = "ok 1 loop_func" ]
 }
+
+@test "expand variables in test name" {
+  SUITE='test/suite' run bats "$FIXTURE_ROOT/expand_var_in_test_name.bats"
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "ok 1 test/suite: test with variable in name" ]
+}
+
+@test "handle quoted and unquoted test names" {
+  run bats "$FIXTURE_ROOT/quoted_and_unquoted_test_names.bats"
+  [ $status -eq 0 ]
+  [ "${lines[1]}" = "ok 1 single-quoted name" ]
+  [ "${lines[2]}" = "ok 2 double-quoted name" ]
+  [ "${lines[3]}" = "ok 3 unquoted" ]
+}

test/fixtures/bats/expand_var_in_test_name.bats

@@ -0,0 +1,3 @@
+@test "$SUITE: test with variable in name" {
+  true
+}

test/fixtures/bats/quoted_and_unquoted_test_names.bats

@@ -0,0 +1,11 @@
+@test 'single-quoted name' {
+  true
+}
+
+@test "double-quoted name" {
+  true
+}
+
+@test unquoted {
+  true
+}