diff --git a/tests/cli/testbuildandtest.py b/tests/cli/testbuildandtest.py
index fe879a2..da3d14b 100644
--- a/tests/cli/testbuildandtest.py
+++ b/tests/cli/testbuildandtest.py
@@ -23,6 +23,30 @@
         print(content, file=theFile, flush=True)
         return theFile
 
+    @require_command_arg("--repos")
+    def test_repos_dir_is_compulsory(self):
+        """Test that we get an error if we don't pass the path to the repos."""
+        self.run_with_output(
+            self.llvm_build_and_test("--source-dir=somewhere",
+                                     "--stage1-build-dir=elsewhere"))
+
+    @require_command_arg("--source-dir")
+    def test_source_dir_is_compulsory(self):
+        """Test that we get an error if we don't pass the path to the sources."""
+        self.run_with_output(
+            self.llvm_build_and_test("--repos-dir=somewhere",
+                                     "--stage1-build-dir=elsewhere"))
+
+    @require_command_arg("--stage1-build-dir")
+    def test_stage1_build_dir_is_compulsory(self):
+        """
+        Test that we get an error if we don't pass the path to the stage 1
+        build directory.
+        """
+        self.run_with_output(
+            self.llvm_build_and_test("--repos-dir=somewhere",
+                                     "--source-dir=elsewhere"))
+
     def test_default_stage1(self):
         """
         Test that we dump the correct commands for a single stage build of LLVM.