diff --git a/tests/harness/corpus-costs/array-from-typed-array-mapper.ts.json b/tests/harness/corpus-costs/array-from-typed-array-mapper.ts.json
new file mode 100644
index 000000000..094458e73
--- /dev/null
+++ b/tests/harness/corpus-costs/array-from-typed-array-mapper.ts.json
@@ -0,0 +1 @@
+{ "plain": 1400, "san": 1200 }
diff --git a/tests/harness/corpus-costs/promise-catch-optional-chain.ts.json b/tests/harness/corpus-costs/promise-catch-optional-chain.ts.json
new file mode 100644
index 000000000..ba681e2a0
--- /dev/null
+++ b/tests/harness/corpus-costs/promise-catch-optional-chain.ts.json
@@ -0,0 +1 @@
+{ "plain": 1000, "san": 900 }
diff --git a/tests/harness/corpus-costs/promise-resolve-promise-or-unit.ts.json b/tests/harness/corpus-costs/promise-resolve-promise-or-unit.ts.json
new file mode 100644
index 000000000..035725f07
--- /dev/null
+++ b/tests/harness/corpus-costs/promise-resolve-promise-or-unit.ts.json
@@ -0,0 +1 @@
+{ "plain": 900, "san": 900 }
diff --git a/tests/harness/corpus-costs/promise-void-catch-undefined.ts.json b/tests/harness/corpus-costs/promise-void-catch-undefined.ts.json
new file mode 100644
index 000000000..a72de5c97
--- /dev/null
+++ b/tests/harness/corpus-costs/promise-void-catch-undefined.ts.json
@@ -0,0 +1 @@
+{ "plain": 1600, "san": 900 }