Implement the first fast option checking test

2 files changed, 37 insertions, 9 deletions

diff --git a/yarns/200-fast-tests.yarn b/yarns/200-fast-tests.yarn
index 6e30fa2..1b0ef97 100644
--- a/yarns/200-fast-tests.yarn
+++ b/yarns/200-fast-tests.yarn
@@ -1,8 +1,13 @@
 # Fast option check tests
 
-* A scenario, or set of scenarios, that verify that certain
-  combinations of vmdebootstrap options work or fail as expected, but
-  without actually building images. The goal is to test command line
-  handling quickly. For example, options that conflict should cause
-  error messages.
-    * FIXME: Check with Neil for suggestions for options.
+This chapter contains fast scenarios that test vmdebootstrap option
+handling. These scenarios do not actually build images, they only
+verify that vmdebootstrap parses the command line correctly.
+
+    SCENARIO --squash and --image used together
+    ASSUMING fast tests are requested
+    WHEN user attempts to run vmdebootstrap
+    ... --squash=FOO --image=BAR --dry-run
+    THEN vmdebootstrap exited with a non-zero exit code
+    AND vmdebootstrap wrote an error message matching --squash
+    AND vmdebootstrap wrote an error message matching --image
diff --git a/yarns/900-implements.yarn b/yarns/900-implements.yarn
index e9e4ec7..72c8f2c 100644
--- a/yarns/900-implements.yarn
+++ b/yarns/900-implements.yarn
@@ -18,11 +18,11 @@ If `TESTS` is not set, everything gets run.
 Scenarios can use the ASSUMING statements defined here to let the user
 to allow them to run or not to run.
 
-    IMPLEMENTS ASSUMING build tests are requested
-    test_requested build
+    IMPLEMENTS ASSUMING (fast|build) tests are requested
+    test_requested "$MATCH_1"
 
 
-## Building an image
+## Building an image, or attempting to
 
 To keep individual steps shorter, we provide some steps to set common
 parts, such as the name of the image being built.
@@ -40,6 +40,29 @@ but it's actually restricted to vmdebootstrap in the source tree.
         --size "$IMAGE_SIZE" \
         $MATCH_1
 
+Attempt to run vmdebootstrap, but allow it it to fail. Capture exit
+code and stderr.
+
+    IMPLEMENTS WHEN user attempts to run vmdebootstrap (.*)
+    if PYTHONPATH="$SRCDIR" "$SRCDIR/bin/vmdebootstrap" \
+        $MATCH_1 2> vmdebootstrap.stderr
+    then
+        echo 0 > vmdebootstrap.exit
+    else
+        echo $? > vmdebootstrap.exit
+    fi
+
+Check for whether the attempted vmdebootstrap run had the desired exit
+code.
+
+    IMPLEMENTS THEN vmdebootstrap exited with a non-zero exit code
+    grep -vFx 0 vmdebootstrap.exit
+
+Check the stderr of the attempted vmdebootstrap run.
+
+    IMPLEMENTS THEN vmdebootstrap wrote an error message matching (.+)
+    grep -P -e "$MATCH_1" vmdebootstrap.stderr
+
 
 ## Static tests on disk images