tests for basic color extraction.

t/themes.vim

@@ -0,0 +1,29 @@
+describe 'themes'
+  after
+    highlight clear Foo
+    highlight clear Normal
+  end
+
+  it 'should extract correct colors'
+    highlight Foo ctermfg=1 ctermbg=2
+    let colors = airline#themes#get_highlight('Foo')
+    Expect colors[2] == '1'
+    Expect colors[3] == '2'
+  end
+
+  it 'should extract from normal if colors unavailable'
+    highlight Normal ctermfg=100 ctermbg=200
+    highlight Foo ctermbg=2
+    let colors = airline#themes#get_highlight('Foo')
+    Expect colors[2] == '100'
+    Expect colors[3] == '2'
+  end
+
+  it 'should flip target group if it is reversed'
+    highlight Foo ctermbg=222 ctermfg=103 term=reverse
+    let colors = airline#themes#get_highlight('Foo')
+    Expect colors[2] == '222'
+    Expect colors[3] == '103'
+  end
+end
+