1 files changed, 10 insertions, 0 deletions
diff --git a/spec/graphql/types/time_type_spec.rb b/spec/graphql/types/time_type_spec.rb
index 68d346766c2..3b0d257e1d7 100644
--- a/spec/graphql/types/time_type_spec.rb
+++ b/spec/graphql/types/time_type_spec.rb
@@ -15,4 +15,14 @@ RSpec.describe GitlabSchema.types['Time'] do
   it 'coerces an ISO-time into Time object' do
     expect(described_class.coerce_isolated_input(iso)).to eq(time)
   end
+
+  it 'rejects invalid input' do
+    expect { described_class.coerce_isolated_input('not valid') }
+      .to raise_error(GraphQL::CoercionError)
+  end
+
+  it 'rejects nil' do
+    expect { described_class.coerce_isolated_input(nil) }
+      .to raise_error(GraphQL::CoercionError)
+  end
 end