| 9 | import "fmt" |
| 10 | |
| 11 | func TestInverse(t *testing.T) { |
| 12 | testCases := []struct { |
| 13 | a int64 |
| 14 | m int64 |
| 15 | expectedValue int64 |
| 16 | expectedError error |
| 17 | }{ |
| 18 | {3, 11, 4, nil}, |
| 19 | {10, 17, 12, nil}, |
| 20 | {2, 6, 0, ErrorInverse}, |
| 21 | {1, 0, 0, ErrorInverse}, |
| 22 | } |
| 23 | for _, tc := range testCases { |
| 24 | testName := fmt.Sprintf("Testing a = %d and m = %d: ", tc.a, tc.m) |
| 25 | t.Run(testName, func(t *testing.T) { |
| 26 | inv, err := Inverse(tc.a, tc.m) |
| 27 | if err != tc.expectedError { |
| 28 | if tc.expectedError == nil { |
| 29 | t.Fatalf("Error was raised when it shouldn't: %v", err) |
| 30 | } else { |
| 31 | t.Fatalf("Error was not raised when it should") |
| 32 | } |
| 33 | } |
| 34 | if inv != tc.expectedValue { |
| 35 | t.Fatalf("expected: %d, got: %d", tc.expectedValue, inv) |
| 36 | } |
| 37 | }) |
| 38 | } |
| 39 | } |