package shachain import ( "reflect" "testing" "github.com/go-errors/errors" ) // bitsToIndex is a helper function which takes 'n' last bits as input and // create shachain index. // Example: // Input: 0,1,1,0,0 // Output: 0b000000000000000000000000000000000000000[01100] == 12 func bitsToIndex(bs ...uint64) (index, error) { if len(bs) > 64 { return 0, errors.New("number of elements should be lower then" + " 64") } var res uint64 for i, e := range bs { if e != 1 && e != 0 { return 0, errors.New("wrong element, should be '0' or" + " '1'") } res += e * 1 << uint(len(bs)-i-1) } return index(res), nil } type deriveTest struct { name string from index to index position []uint8 shouldFail bool } func generateTests(t *testing.T) []deriveTest { var ( tests []deriveTest from index to index err error ) from, err = bitsToIndex(0) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "zero 'from' 'to'", from: from, to: to, position: nil, shouldFail: false, }) from, err = bitsToIndex(0, 1, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(0, 1, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "same indexes #1", from: from, to: to, position: nil, shouldFail: false, }) from, err = bitsToIndex(1) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "same indexes #2", from: from, to: to, shouldFail: true, }) from, err = bitsToIndex(0, 0, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(0, 0, 1, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "test seed 'from'", from: from, to: to, position: []uint8{1}, shouldFail: false, }) from, err = bitsToIndex(1, 1, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(0, 1, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "not the same indexes", from: from, to: to, shouldFail: true, }) from, err = bitsToIndex(1, 0, 1, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(1, 0, 0, 0) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "'from' index greater then 'to' index", from: from, to: to, shouldFail: true, }) from, err = bitsToIndex(1) if err != nil { t.Fatalf("can't generate from index: %v", err) } to, err = bitsToIndex(1) if err != nil { t.Fatalf("can't generate from index: %v", err) } tests = append(tests, deriveTest{ name: "zero number trailing zeros", from: from, to: to, position: nil, shouldFail: false, }) return tests } // TestDeriveIndex check the correctness of index derive function by testing // the index corner cases. func TestDeriveIndex(t *testing.T) { for _, test := range generateTests(t) { pos, err := test.from.deriveBitTransformations(test.to) if err != nil { if !test.shouldFail { t.Fatalf("Failed (%v): %v", test.name, err) } } else { if test.shouldFail { t.Fatalf("Failed (%v): test should failed "+ "but it's not", test.name) } if !reflect.DeepEqual(pos, test.position) { t.Fatalf("Failed(%v): position is wrong real:"+ "%v expected:%v", test.name, pos, test.position) } } t.Logf("Passed: %v", test.name) } } var deriveElementTests = []struct { name string index index output string seed string shouldFail bool }{ { name: "generate_from_seed FF alternate bits 1", index: 0xaaaaaaaaaaa, output: "56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528", seed: "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", shouldFail: false, }, { name: "generate_from_seed FF alternate bits 2", index: 0x555555555555, output: "9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31", seed: "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", shouldFail: false, }, { name: "generate_from_seed 01 last nontrivial node", index: 1, output: "915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c", seed: "0101010101010101010101010101010101010101010101010101010101010101", shouldFail: false, }, } // TestSpecificationDeriveElement is used to check the consistency with // specification hash derivation function. func TestSpecificationDeriveElement(t *testing.T) { for _, test := range deriveElementTests { // Generate seed element. element, err := newElementFromStr(test.seed, rootIndex) if err != nil { t.Fatal(err) } // Derive element by index. result, err := element.derive(test.index) if err != nil { if !test.shouldFail { t.Fatalf("Failed (%v): %v", test.name, err) } } else { if test.shouldFail { t.Fatalf("Failed (%v): test should failed "+ "but it's not", test.name) } // Generate element which we should get after deriviation. output, err := newElementFromStr(test.output, test.index) if err != nil { t.Fatal(err) } // Check that they are equal. if !result.isEqual(output) { t.Fatalf("Failed (%v): hash is wrong, real:"+ "%v expected:%v", test.name, result.hash.String(), output.hash.String()) } } t.Logf("Passed (%v)", test.name) } }