diff --git a/kiplot/pre_erc.py b/kiplot/pre_erc.py
index 73dacc26..73d28968 100644
--- a/kiplot/pre_erc.py
+++ b/kiplot/pre_erc.py
@@ -39,5 +39,5 @@ class Run_ERC(BasePreFlight):  # noqa: F821
             if ret < 0:
                 logger.error('ERC errors: %d', -ret)
             else:
-                logger.error('ERC returned %d', ret)  # pragma: no cover
+                logger.error('ERC returned %d', ret)
             exit(ERC_ERROR)
diff --git a/tests/test_plot/test_preflight.py b/tests/test_plot/test_preflight.py
index 973f5923..cae47636 100644
--- a/tests/test_plot/test_preflight.py
+++ b/tests/test_plot/test_preflight.py
@@ -23,7 +23,7 @@ if prev_dir not in sys.path:
     sys.path.insert(0, prev_dir)
 # Utils import
 from utils import context
-from kiplot.misc import (DRC_ERROR, ERC_ERROR)
+from kiplot.misc import (DRC_ERROR, ERC_ERROR, BOM_ERROR)
 
 
 def test_erc():
@@ -35,15 +35,24 @@ def test_erc():
     ctx.clean_up()
 
 
-def test_erc_fail():
+def test_erc_fail_1():
+    """ Using an SCH with ERC errors """
     prj = 'fail-erc'
-    ctx = context.TestContext('ERC', prj, 'erc', '')
+    ctx = context.TestContext('ERCFail1', prj, 'erc', '')
     ctx.run(ERC_ERROR)
     # Check all outputs are there
     ctx.expect_out_file(prj+'.erc')
     ctx.clean_up()
 
 
+def test_erc_fail_2():
+    """ Using a dummy SCH """
+    prj = '3Rs'
+    ctx = context.TestContext('ERCFail2', prj, 'erc', '')
+    ctx.run(ERC_ERROR)
+    ctx.clean_up()
+
+
 def test_drc():
     prj = 'bom'
     ctx = context.TestContext('DRC', prj, 'drc', '')
@@ -83,6 +92,14 @@ def test_drc_error():
     ctx.clean_up()
 
 
+def test_drc_fail():
+    """ Check we dummy PCB """
+    prj = 'bom_no_xml'
+    ctx = context.TestContext('DRCFail', prj, 'drc', '')
+    ctx.run(DRC_ERROR)
+    ctx.clean_up()
+
+
 def test_update_xml():
     prj = 'bom'
     ctx = context.TestContext('Update_XML', prj, 'update_xml', '')
@@ -100,3 +117,11 @@ def test_update_xml():
         os.remove(xml)
         os.rename(xml+'-bak', xml)
     ctx.clean_up()
+
+
+def test_update_xml_fail():
+    """ Using a dummy SCH """
+    prj = '3Rs'
+    ctx = context.TestContext('Update_XMLFail', prj, 'update_xml', '')
+    ctx.run(BOM_ERROR)
+    ctx.clean_up()
diff --git a/tests/test_plot/test_yaml_errors.py b/tests/test_plot/test_yaml_errors.py
index 5a23111c..0cf7cae0 100644
--- a/tests/test_plot/test_yaml_errors.py
+++ b/tests/test_plot/test_yaml_errors.py
@@ -343,6 +343,14 @@ def test_error_wrong_type_3():
     ctx.clean_up()
 
 
+def test_error_wrong_type_4():
+    """ update_xml = number """
+    ctx = context.TestContext('ErrorWrongType4', PRJ, 'error_pre_wrong_type_4', '')
+    ctx.run(EXIT_BAD_CONFIG)
+    assert ctx.search_err("In preflight 'update_xml': must be boolean")
+    ctx.clean_up()
+
+
 def test_error_yaml():
     ctx = context.TestContext('ErrorYAML', PRJ, 'error_yaml', '')
     ctx.run(EXIT_BAD_CONFIG)
diff --git a/tests/yaml_samples/error_pre_wrong_type_4.kiplot.yaml b/tests/yaml_samples/error_pre_wrong_type_4.kiplot.yaml
new file mode 100644
index 00000000..a77153a4
--- /dev/null
+++ b/tests/yaml_samples/error_pre_wrong_type_4.kiplot.yaml
@@ -0,0 +1,9 @@
+# Example KiPlot config file
+kiplot:
+  version: 1
+
+preflight:
+  update_xml: 5
+  run_erc: true
+
+