add tests for theme generate helper functions

t/themes.vim

@@ -33,5 +33,40 @@ describe 'themes'
     let hl = airline#themes#get_highlight2(['Foo','bg'], ['Foo','fg'], 'italic', 'bold')
     Expect hl == ['', '', 1, 0, 'italic,bold']
   end
+
+  it 'should generate color map with mirroring'
+    let map = airline#themes#generate_color_map(
+          \ [ 1, 1, 1, 1, '1' ],
+          \ [ 2, 2, 2, 2, '2' ],
+          \ [ 3, 3, 3, 3, '3' ],
+          \ [ 4, 4, 4, 4, '4' ],
+          \ )
+    Expect map.airline_a[0] == 1
+    Expect map.airline_b[0] == 2
+    Expect map.airline_c[0] == 3
+    Expect map.airline_file[0] == 4
+    Expect map.airline_x[0] == 3
+    Expect map.airline_y[0] == 2
+    Expect map.airline_z[0] == 1
+  end
+
+  it 'should generate color map with full set of colors'
+    let map = airline#themes#generate_color_map(
+          \ [ 1, 1, 1, 1, '1' ],
+          \ [ 2, 2, 2, 2, '2' ],
+          \ [ 3, 3, 3, 3, '3' ],
+          \ [ 4, 4, 4, 4, '4' ],
+          \ [ 5, 5, 5, 5, '5' ],
+          \ [ 6, 6, 6, 6, '6' ],
+          \ [ 7, 7, 7, 7, '7' ],
+          \ )
+    Expect map.airline_a[0] == 1
+    Expect map.airline_b[0] == 2
+    Expect map.airline_c[0] == 3
+    Expect map.airline_x[0] == 4
+    Expect map.airline_y[0] == 5
+    Expect map.airline_z[0] == 6
+    Expect map.airline_file[0] == 7
+  end
 end