Added ERC test

tests/board_samples/bom.sch

@@ -89,9 +89,51 @@ F 3 "" H 3500 1950 50  0001 C CNN
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	3500 2050 3500 1950
+	3500 2050 3500 2000
 Wire Wire Line
 	3500 3000 3500 2900
 Wire Wire Line
 	3900 3000 3900 2900
+$Comp
+L power:GND #PWR0101
+U 1 1 5EC534BF
+P 4500 3050
+F 0 "#PWR0101" H 4500 2800 50  0001 C CNN
+F 1 "GND" H 4505 2877 50  0000 C CNN
+F 2 "" H 4500 3050 50  0001 C CNN
+F 3 "" H 4500 3050 50  0001 C CNN
+	1    4500 3050
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:PWR_FLAG #FLG0101
+U 1 1 5EC53A6E
+P 4500 2950
+F 0 "#FLG0101" H 4500 3025 50  0001 C CNN
+F 1 "PWR_FLAG" H 4500 3123 50  0000 C CNN
+F 2 "" H 4500 2950 50  0001 C CNN
+F 3 "~" H 4500 2950 50  0001 C CNN
+	1    4500 2950
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:PWR_FLAG #FLG0102
+U 1 1 5EC53E1A
+P 3200 1950
+F 0 "#FLG0102" H 3200 2025 50  0001 C CNN
+F 1 "PWR_FLAG" H 3200 2123 50  0000 C CNN
+F 2 "" H 3200 1950 50  0001 C CNN
+F 3 "~" H 3200 1950 50  0001 C CNN
+	1    3200 1950
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3200 1950 3200 2000
+Wire Wire Line
+	3200 2000 3500 2000
+Connection ~ 3500 2000
+Wire Wire Line
+	3500 2000 3500 1950
+Wire Wire Line
+	4500 2950 4500 3050
 $EndSCHEMATC

tests/test_plot/test_preflight.py

@@ -0,0 +1,29 @@
+"""
+Tests for the preflight options
+
+We test:
+- ERC
+
+For debug information use:
+pytest-3 --log-cli-level debug
+
+"""
+
+import os
+import sys
+# Look for the 'utils' module from where the script is running
+script_dir = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.dirname(script_dir))
+# Utils import
+from utils import context
+
+
+def test_erc():
+    prj = 'bom'
+    ctx = context.TestContext('ERC', prj, 'erc', '')
+    ctx.run()
+    # Check all outputs are there
+    ctx.expect_out_file(prj+'.erc')
+    # We don't have a project, and we don't want one
+    os.remove(os.path.join(ctx.get_board_dir(), prj+'.pro'))
+    ctx.clean_up()

tests/yaml_samples/erc.kiplot.yaml

@@ -0,0 +1,8 @@
+# Example KiPlot config file
+kiplot:
+  version: 1
+
+preflight:
+  run_erc: true
+
+