diff --git a/docs/test-doubles.md b/docs/test-doubles.md
index 5f12f69c..c7163a44 100644
--- a/docs/test-doubles.md
+++ b/docs/test-doubles.md
@@ -156,3 +156,26 @@ function test_failure() {
 }
 ```
 :::
+
+## assert_not_called
+> `assert_not_called "spy"`
+
+Reports an error if `spy` has been executed at least once.
+
+::: code-group
+```bash [Example]
+function test_success() {
+  spy ps
+
+  assert_not_called ps
+}
+
+function test_failure() {
+  spy ps
+
+  ps
+
+  assert_not_called ps
+}
+```
+:::
diff --git a/src/test_doubles.sh b/src/test_doubles.sh
index c9c02e19..29ba8102 100644
--- a/src/test_doubles.sh
+++ b/src/test_doubles.sh
@@ -141,3 +141,9 @@ function assert_have_been_called_times() {
 
   state::add_assertions_passed
 }
+
+function assert_not_called() {
+  local command=$1
+  local label="${2:-$(helper::normalize_test_function_name "${FUNCNAME[1]}")}"
+  assert_have_been_called_times 0 "$command" "$label"
+}
diff --git a/tests/unit/test_doubles_test.sh b/tests/unit/test_doubles_test.sh
index 22040c67..a789d0a0 100644
--- a/tests/unit/test_doubles_test.sh
+++ b/tests/unit/test_doubles_test.sh
@@ -147,3 +147,21 @@ function test_spy_called_with_different_arguments() {
   assert_have_been_called_with "first_a first_b" ps 1
   assert_have_been_called_with "second" ps 2
 }
+
+function test_spy_successful_not_called() {
+  spy ps
+
+  assert_not_called ps
+}
+
+function test_spy_unsuccessful_not_called() {
+  spy ps
+
+  ps
+
+  assert_same \
+    "$(console_results::print_failed_test "Spy unsuccessful not called" "ps" \
+      "to has been called" "0 times" \
+      "actual" "1 times")" \
+    "$(assert_not_called ps)"
+}