package objchange import ( "fmt" "testing" "github.com/zclconf/go-cty/cty" ) func TestLongestCommonSubsequence(t *testing.T) { tests := []struct { xs []cty.Value ys []cty.Value want []cty.Value }{ { []cty.Value{}, []cty.Value{}, []cty.Value{}, }, { []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, }, { []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(3), cty.NumberIntVal(4)}, []cty.Value{}, }, { []cty.Value{cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(2)}, }, { []cty.Value{cty.NumberIntVal(1)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(1)}, }, { []cty.Value{cty.NumberIntVal(2), cty.NumberIntVal(1)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2)}, []cty.Value{cty.NumberIntVal(1)}, // arbitrarily selected 1; 2 would also be valid }, { []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2), cty.NumberIntVal(3), cty.NumberIntVal(4)}, []cty.Value{cty.NumberIntVal(2), cty.NumberIntVal(4), cty.NumberIntVal(5)}, []cty.Value{cty.NumberIntVal(2), cty.NumberIntVal(4)}, }, { []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2), cty.NumberIntVal(3), cty.NumberIntVal(4)}, []cty.Value{cty.NumberIntVal(4), cty.NumberIntVal(2), cty.NumberIntVal(5)}, []cty.Value{cty.NumberIntVal(4)}, // 2 would also be valid }, { []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(2), cty.NumberIntVal(3), cty.NumberIntVal(5)}, []cty.Value{cty.NumberIntVal(2), cty.NumberIntVal(4), cty.NumberIntVal(5)}, []cty.Value{cty.NumberIntVal(2), cty.NumberIntVal(5)}, }, // unknowns never compare as equal { []cty.Value{cty.NumberIntVal(1), cty.UnknownVal(cty.Number), cty.NumberIntVal(3)}, []cty.Value{cty.NumberIntVal(1), cty.UnknownVal(cty.Number), cty.NumberIntVal(3)}, []cty.Value{cty.NumberIntVal(1), cty.NumberIntVal(3)}, }, { []cty.Value{cty.UnknownVal(cty.Number)}, []cty.Value{cty.UnknownVal(cty.Number)}, []cty.Value{}, }, } for _, test := range tests { t.Run(fmt.Sprintf("%#v,%#v", test.xs, test.ys), func(t *testing.T) { got := LongestCommonSubsequence(test.xs, test.ys) wrong := func() { t.Fatalf( "wrong result\nX: %#v\nY: %#v\ngot: %#v\nwant: %#v", test.xs, test.ys, got, test.want, ) } if len(got) != len(test.want) { wrong() } for i := range got { if got[i] == cty.NilVal { wrong() } if !got[i].RawEquals(test.want[i]) { wrong() } } }) } }