Regression testing: cairo mock object stores graphics calls

So the idea behind this is maintain an "expected value" for the sample runs. We store the graphics calls and their arguments as a readable text file. Any change in the samples will break this, but the idea is to make sure this doesn't get broken unexpectedly.

Rearranged the data files in specs

spec/data/layouts/easy-circular-extends.yml

@@ -0,0 +1,6 @@
+a:
+  extends: b
+  x: 50
+b:
+  extends: a
+  x: 150

spec/data/layouts/hard-circular-extends.yml

@@ -0,0 +1,9 @@
+a:
+  extends: c
+  x: 50
+b:
+  extends: a
+  x: 150
+c:
+  extends: b
+  y: 250

spec/data/layouts/multi-extends-single-entry.yml

@@ -0,0 +1,14 @@
+aunt:
+  a: 101
+  b: 102
+  c: 103
+uncle:
+  x: 104
+  y: 105
+  b: 106
+child:
+  extends:
+    - uncle
+    - aunt
+  a: 107
+  x: 108

spec/data/layouts/multi-level-extends.yml

@@ -0,0 +1,10 @@
+frame:
+  x: 38
+  y: 38
+title:
+  extends: frame
+  y: 50
+  width: 100
+subtitle:
+  extends: title
+  y: 150

spec/data/layouts/multifile-a.yml

@@ -0,0 +1,4 @@
+title:
+  x: 100
+subtitle:
+  x: 200

spec/data/layouts/multifile-b.yml

@@ -0,0 +1,4 @@
+title: # redefined
+  x: 300
+desc:
+  x: 400

spec/data/layouts/multifile-extends-a.yml

@@ -0,0 +1,8 @@
+grandparent:
+  x: 100
+parent_a:
+  extends: grandparent
+  x: += 10   # evaluates to 110
+parent_b: 
+  extends: grandparent
+  x: += 20   # evaluates to 120, for now...

spec/data/layouts/multifile-extends-b.yml

@@ -0,0 +1,9 @@
+child_a:
+  extends: parent_a
+  x: += 3    # evaluates to 113
+parent_b:    # redefined
+  extends: grandparent
+  x: += 30   # evaluates to 130
+child_b:
+  extends: parent_b
+  x: += 3    # evaluates to 133

spec/data/layouts/no-extends.yml

@@ -0,0 +1,5 @@
+frame:
+  x: 38
+  valign: !ruby/symbol middle
+  str: "blah"
+  font: Mr. Font

spec/data/layouts/pre-extends.yml

@@ -0,0 +1,7 @@
+title:
+  extends: frame
+  y: 50
+  width: 100
+frame:
+  x: 38
+  y: 38

spec/data/layouts/self-circular-extends.yml

@@ -0,0 +1,3 @@
+a:
+  extends: a
+  x: 50

spec/data/layouts/single-extends.yml

@@ -0,0 +1,7 @@
+frame:
+  x: 38
+  y: 38
+title:
+  extends: frame
+  y: 50
+  width: 100

spec/data/layouts/single-level-multi-extends.yml

@@ -0,0 +1,12 @@
+frame:
+  x: 38
+  y: 38
+title:
+  extends: frame
+  y: 50
+  width: 100
+title2:
+  extends: frame
+  x: 75
+  y: 150
+  width: 150