Add tests for utils.invert

test/library/utils.lua

@@ -13,3 +13,30 @@ function test.OrderedTable()
         i = i + 1
     end
 end
+
+function test.invert()
+    local t = {}
+    local i = utils.invert{'a', 4.4, false, true, 5, t}
+    expect.eq(i.a, 1)
+    expect.eq(i[4.4], 2)
+    expect.eq(i[false], 3)
+    expect.eq(i[true], 4)
+    expect.eq(i[5], 5)
+    expect.eq(i[t], 6)
+    expect.eq(i[700], nil)
+    expect.eq(i.foo, nil)
+    expect.eq(i[{}], nil)
+end
+
+function test.invert_nil()
+    local i = utils.invert{'a', nil, 'b'}
+    expect.eq(i.a, 1)
+    expect.eq(i[nil], nil)
+    expect.eq(i.b, 3)
+end
+
+function test.invert_overwrite()
+    local i = utils.invert{'a', 'b', 'a'}
+    expect.eq(i.b, 2)
+    expect.eq(i.a, 3)
+end