diff --git a/src/engine/ExportQueryExecutionTrees.cpp b/src/engine/ExportQueryExecutionTrees.cpp
index eb25b7e6e..676e8814b 100644
--- a/src/engine/ExportQueryExecutionTrees.cpp
+++ b/src/engine/ExportQueryExecutionTrees.cpp
@@ -12,11 +12,13 @@
 #include "util/ConstexprUtils.h"
 #include "util/http/MediaTypes.h"
 
-bool getResultForAsk(const std::shared_ptr<const Result>& res) {
-  if (res->isFullyMaterialized()) {
-    return !res->idTable().empty();
+// Return true iff the `result` is nonempty.
+bool getResultForAsk(const std::shared_ptr<const Result>& result) {
+  if (result->isFullyMaterialized()) {
+    return !result->idTable().empty();
   } else {
-    return std::ranges::any_of(res->idTables(), std::not_fn(&IdTable::empty));
+    return std::ranges::any_of(result->idTables(),
+                               std::not_fn(&IdTable::empty));
   }
 }
 
@@ -52,6 +54,7 @@ ad_utility::streams::stream_generator computeResultForAsk(
       j["head"] = nlohmann::json::object_t{};
       j["boolean"] = result;
       co_yield j.dump();
+      break;
     }
     default:
       throw std::runtime_error{
@@ -835,7 +838,7 @@ ExportQueryExecutionTrees::computeResultAsQLeverJSON(
     jsonPrefix["selected"] =
         std::vector<std::string>{"?subject", "?predicate", "?object"};
   } else {
-    // TODO<joka921> Assert that this is an ASK clause.
+    AD_CORRECTNESS_CHECK(query.hasAskClause());
     jsonPrefix["selected"] = std::vector<std::string>{"?result"};
   }
 
diff --git a/test/ExportQueryExecutionTreesTest.cpp b/test/ExportQueryExecutionTreesTest.cpp
index 96a0a3b7c..81408161f 100644
--- a/test/ExportQueryExecutionTreesTest.cpp
+++ b/test/ExportQueryExecutionTreesTest.cpp
@@ -89,6 +89,8 @@ struct TestCaseSelectQuery {
   std::string resultXml;
 };
 
+// A test case that tests the correct execution and exporting of an ASK query
+// in various formats.
 struct TestCaseAskQuery {
   std::string kg;                   // The knowledge graph (TURTLE)
   std::string query;                // The query (SPARQL)
@@ -100,15 +102,6 @@ struct TestCaseAskQuery {
   std::string resultXml;
 };
 
-// TODO<joka921> setup one test case for the ASK -> true and one for the ASK ->
-// false case and use them for unit testing.
-/*
-TestCaseAskQuery askResultTrue() {
-  TestCaseAskQuery testCase;
-  testCase.resultQLeverJSON = nlohmann::json::parse("[]");
-}
- */
-
 struct TestCaseConstructQuery {
   std::string kg;                   // The knowledge graph (TURTLE)
   std::string query;                // The query (SPARQL)
@@ -176,7 +169,7 @@ void runConstructQueryTestCase(
 void runAskQueryTestCase(
     const TestCaseAskQuery& testCase,
     ad_utility::source_location l = ad_utility::source_location::current()) {
-  auto trace = generateLocationTrace(l, "runConstructQueryTestCase");
+  auto trace = generateLocationTrace(l, "runAskQueryTestCase");
   using enum ad_utility::MediaType;
   // TODO<joka921> match the exception
   EXPECT_ANY_THROW(runQueryStreamableResult(testCase.kg, testCase.query, tsv));
@@ -1222,6 +1215,40 @@ TEST(ExportQueryExecutionTrees, CornerCases) {
       ::testing::ContainsRegex("should be unreachable"));
 }
 
+// Test the correct exporting of ASK queries.
+TEST(ExportQueryExecutionTrees, AskQuery) {
+  auto askResultTrue = []() {
+    TestCaseAskQuery testCase;
+    testCase.query = "ASK { BIND (3 as ?x) FILTER (?x > 0)}";
+    testCase.resultQLeverJSON = nlohmann::json{std::vector<std::string>{
+        "\"true\"^^<http://www.w3.org/2001/XMLSchema#boolean>"}};
+    testCase.resultSparqlJSON =
+        nlohmann::json::parse(R"({"head":{ }, "boolean" : true})");
+    testCase.resultXml =
+        "<?xml version=\"1.0\"?>\n<sparql "
+        "xmlns=\"http://www.w3.org/2005/sparql-results#\">\n  <head/>\n  "
+        "<boolean>true</boolean>\n</sparql>";
+
+    return testCase;
+  };
+
+  auto askResultFalse = []() {
+    TestCaseAskQuery testCase;
+    testCase.query = "ASK { BIND (3 as ?x) FILTER (?x < 0)}";
+    testCase.resultQLeverJSON = nlohmann::json{std::vector<std::string>{
+        "\"false\"^^<http://www.w3.org/2001/XMLSchema#boolean>"}};
+    testCase.resultSparqlJSON =
+        nlohmann::json::parse(R"({"head":{ }, "boolean" : false})");
+    testCase.resultXml =
+        "<?xml version=\"1.0\"?>\n<sparql "
+        "xmlns=\"http://www.w3.org/2005/sparql-results#\">\n  <head/>\n  "
+        "<boolean>false</boolean>\n</sparql>";
+    return testCase;
+  };
+  runAskQueryTestCase(askResultTrue());
+  runAskQueryTestCase(askResultFalse());
+}
+
 using enum ad_utility::MediaType;
 
 // ____________________________________________________________________________