diff --git a/test/deps.sql b/test/deps.sql
index bc5e06d..e98348d 100644
--- a/test/deps.sql
+++ b/test/deps.sql
@@ -10,8 +10,14 @@ SET client_min_messages = NOTICE;
 \set TT extension_drop_test_table
 CREATE TEMP TABLE :TT (i int);
 
-CREATE SCHEMA :TEST_SCHEMA;
-SET search_path = :TEST_SCHEMA, tap, "$user";
+/*
+ * :TEST_SCHEMA can be mixed-case (see test/sql/schema.sql), so it MUST be
+ * identifier-quoted here -- an unquoted interpolation would silently fold
+ * to lowercase and every test would end up running against a different,
+ * unquoted schema than the one it thinks it's using.
+ */
+CREATE SCHEMA :"TEST_SCHEMA";
+SET search_path = :"TEST_SCHEMA", tap, "$user";
 
 /*
  * Now load our extension. We don't use IF NOT EXISTs here because we want an
diff --git a/test/expected/schema.out b/test/expected/schema.out
index 12db609..511254e 100644
--- a/test/expected/schema.out
+++ b/test/expected/schema.out
@@ -4,12 +4,12 @@ ok 1 - Create test extension
 ok 2 - Test extension exists
 ok 3 - Drop test extension
 ok 4 - Test extension does not exist
-ok 5 - Table _test_ed.extension_drop__commands should exist
+ok 5 - Table "_Test_Ed".extension_drop__commands should exist
 ok 6 - Drop extension
-ok 7 - Create extension in schema _test_ed_2
-ok 8 - Table _test_ed_2.extension_drop__commands should exist
-ok 9 - Create test extension in _test_ed_2
+ok 7 - Create extension in schema _Test_Ed_2
+ok 8 - Table "_Test_Ed_2".extension_drop__commands should exist
+ok 9 - Create test extension in _Test_Ed_2
 ok 10 - extension_drop__update()
 ok 11 - Verify extension_drop__get()
-ok 12 - Drop schema _test_ed without cascade succeeds
+ok 12 - Drop schema _Test_Ed without cascade succeeds
 # TRANSACTION INTENTIONALLY LEFT OPEN!
diff --git a/test/sql/schema.sql b/test/sql/schema.sql
index fa70ed4..ccc1999 100644
--- a/test/sql/schema.sql
+++ b/test/sql/schema.sql
@@ -1,8 +1,16 @@
 \set ECHO none
-\set TEST_SCHEMA _test_ed
+\set TEST_SCHEMA _Test_Ed
 \i test/pgxntool/setup.sql
 
-CREATE SCHEMA _test_ed_2;
+/*
+ * :TEST_SCHEMA and :TEST_SCHEMA_2 are mixed-case, so every reference to
+ * them MUST be identifier-quoted (:"TEST_SCHEMA", or %I via format()) --
+ * an unquoted reference would silently fold to lowercase and test a
+ * different, unquoted schema instead of this one, without erroring.
+ * That's deliberate: it turns a missing-quote bug in the code under test
+ * into a hard failure instead of a silent pass.
+ */
+CREATE SCHEMA "_Test_Ed_2";
 
 SELECT plan(
   0
@@ -28,7 +36,7 @@ SELECT lives_ok(
   , 'Drop extension'
 );
 
-\set TEST_SCHEMA_2 _test_ed_2
+\set TEST_SCHEMA_2 _Test_Ed_2
 SELECT lives_ok(
   format( $$CREATE EXTENSION extension_drop SCHEMA %I$$, :'TEST_SCHEMA_2' )
   , 'Create extension in schema ' || :'TEST_SCHEMA_2'
@@ -44,11 +52,11 @@ SELECT lives_ok(
 SET search_path = "$user", public, tap;
 
 SELECT lives_ok(
-  $$SELECT _test_ed_2.extension_drop__update('extension_drop_test', 'moo')$$
+  format( $$SELECT %I.extension_drop__update('extension_drop_test', 'moo')$$, :'TEST_SCHEMA_2' )
   , 'extension_drop__update()'
 );
 SELECT bag_eq(
-  $$SELECT * FROM _test_ed_2.extension_drop__get('extension_drop_test')$$
+  format( $$SELECT * FROM %I.extension_drop__get('extension_drop_test')$$, :'TEST_SCHEMA_2' )
   , $$SELECT 'extension_drop_test'::name , 'moo'::text$$
   , 'Verify extension_drop__get()'
 );