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| 1 | +package com.babelqueue; |
| 2 | + |
| 3 | +import static org.junit.jupiter.api.Assertions.assertEquals; |
| 4 | +import static org.junit.jupiter.api.Assertions.assertNull; |
| 5 | +import static org.junit.jupiter.api.Assertions.assertSame; |
| 6 | +import static org.junit.jupiter.api.Assertions.assertThrows; |
| 7 | +import static org.junit.jupiter.api.Assertions.assertTrue; |
| 8 | + |
| 9 | +import java.math.BigInteger; |
| 10 | +import java.util.Arrays; |
| 11 | +import java.util.List; |
| 12 | +import java.util.Map; |
| 13 | +import org.junit.jupiter.api.Test; |
| 14 | + |
| 15 | +/** Exercises the hand-rolled JSON codec's error/escape/number paths and the exceptions. */ |
| 16 | +class JsonEdgeCasesTest { |
| 17 | + |
| 18 | + // ---- writer ---------------------------------------------------------------- |
| 19 | + |
| 20 | + @Test |
| 21 | + void writesArraysAndNestedStructures() { |
| 22 | + assertEquals("[1,2,3]", Json.write(List.of(1, 2, 3))); |
| 23 | + assertEquals("{\"a\":[true,null]}", Json.write(Map.of("a", Arrays.asList(true, null)))); |
| 24 | + } |
| 25 | + |
| 26 | + @Test |
| 27 | + void writeRejectsNonFiniteNumbers() { |
| 28 | + assertThrows(BabelQueueException.class, () -> Json.write(Double.NaN)); |
| 29 | + assertThrows(BabelQueueException.class, () -> Json.write(Double.POSITIVE_INFINITY)); |
| 30 | + } |
| 31 | + |
| 32 | + @Test |
| 33 | + void writeFallsBackToToStringForUnknownTypes() { |
| 34 | + Object weird = new Object() { |
| 35 | + @Override |
| 36 | + public String toString() { |
| 37 | + return "X"; |
| 38 | + } |
| 39 | + }; |
| 40 | + assertEquals("\"X\"", Json.write(weird)); |
| 41 | + } |
| 42 | + |
| 43 | + @Test |
| 44 | + void writeEscapesAllControlCharacters() { |
| 45 | + assertEquals("\"\\b\\f\\n\\r\\t\"", Json.write("\b\f\n\r\t")); |
| 46 | + assertEquals("\"\\u0001\"", Json.write(String.valueOf((char) 1))); |
| 47 | + } |
| 48 | + |
| 49 | + @Test |
| 50 | + void writesIntegersDoublesAndBigIntegers() { |
| 51 | + assertEquals("42", Json.write(42L)); |
| 52 | + assertEquals("3.5", Json.write(3.5)); |
| 53 | + assertEquals( |
| 54 | + "123456789012345678901234567890", |
| 55 | + Json.write(new BigInteger("123456789012345678901234567890"))); |
| 56 | + } |
| 57 | + |
| 58 | + // ---- parser: strings / escapes -------------------------------------------- |
| 59 | + |
| 60 | + @Test |
| 61 | + void parsesAllStringEscapes() { |
| 62 | + assertEquals("\"", Json.parse("\"\\\"\"")); |
| 63 | + assertEquals("/", Json.parse("\"\\/\"")); |
| 64 | + assertEquals("\b\f\n\r\t", Json.parse("\"\\b\\f\\n\\r\\t\"")); |
| 65 | + assertEquals("A", Json.parse("\"\\u0041\"")); |
| 66 | + } |
| 67 | + |
| 68 | + @Test |
| 69 | + void rejectsInvalidAndTruncatedEscapes() { |
| 70 | + assertThrows(BabelQueueException.class, () -> Json.parse("\"\\x\"")); |
| 71 | + assertThrows(BabelQueueException.class, () -> Json.parse("\"\\u00\"")); |
| 72 | + assertThrows(BabelQueueException.class, () -> Json.parse("\"abc")); |
| 73 | + } |
| 74 | + |
| 75 | + // ---- parser: numbers ------------------------------------------------------- |
| 76 | + |
| 77 | + @Test |
| 78 | + void parsesNumberForms() { |
| 79 | + assertEquals(-7L, Json.parse("-7")); |
| 80 | + assertEquals(3.14, Json.parse("3.14")); |
| 81 | + assertEquals(1.5e3, Json.parse("1.5E+3")); |
| 82 | + assertEquals(2.0e-2, Json.parse("2e-2")); |
| 83 | + assertEquals( |
| 84 | + new BigInteger("123456789012345678901234567890"), |
| 85 | + Json.parse("123456789012345678901234567890")); |
| 86 | + } |
| 87 | + |
| 88 | + // ---- parser: literals ------------------------------------------------------ |
| 89 | + |
| 90 | + @Test |
| 91 | + void parsesBooleansAndNull() { |
| 92 | + assertEquals(Boolean.TRUE, Json.parse("true")); |
| 93 | + assertEquals(Boolean.FALSE, Json.parse("false")); |
| 94 | + assertNull(Json.parse("null")); |
| 95 | + } |
| 96 | + |
| 97 | + @Test |
| 98 | + void rejectsBadLiterals() { |
| 99 | + assertThrows(BabelQueueException.class, () -> Json.parse("tru")); |
| 100 | + assertThrows(BabelQueueException.class, () -> Json.parse("nul")); |
| 101 | + } |
| 102 | + |
| 103 | + // ---- parser: structure ----------------------------------------------------- |
| 104 | + |
| 105 | + @Test |
| 106 | + void parsesEmptyObjectAndArray() { |
| 107 | + assertEquals(Map.of(), Json.parse("{}")); |
| 108 | + assertEquals(List.of(), Json.parse("[]")); |
| 109 | + } |
| 110 | + |
| 111 | + @Test |
| 112 | + void rejectsObjectStructureErrors() { |
| 113 | + assertThrows(BabelQueueException.class, () -> Json.parse("{1:2}")); |
| 114 | + assertThrows(BabelQueueException.class, () -> Json.parse("{\"a\" 1}")); |
| 115 | + assertThrows(BabelQueueException.class, () -> Json.parse("{\"a\":1 \"b\":2}")); |
| 116 | + } |
| 117 | + |
| 118 | + @Test |
| 119 | + void rejectsArrayStructureErrors() { |
| 120 | + assertThrows(BabelQueueException.class, () -> Json.parse("[1 2]")); |
| 121 | + } |
| 122 | + |
| 123 | + @Test |
| 124 | + void rejectsTrailingContentUnexpectedCharAndEnd() { |
| 125 | + assertThrows(BabelQueueException.class, () -> Json.parse("1 2")); |
| 126 | + assertThrows(BabelQueueException.class, () -> Json.parse("@")); |
| 127 | + assertThrows(BabelQueueException.class, () -> Json.parse("")); |
| 128 | + } |
| 129 | + |
| 130 | + // ---- exceptions ------------------------------------------------------------ |
| 131 | + |
| 132 | + @Test |
| 133 | + void exceptionConstructors() { |
| 134 | + UnknownUrnException u = new UnknownUrnException("urn:babel:x:y"); |
| 135 | + assertTrue(u.getMessage().contains("urn:babel:x:y")); |
| 136 | + |
| 137 | + Throwable cause = new IllegalStateException("boom"); |
| 138 | + BabelQueueException e = new BabelQueueException("wrapped", cause); |
| 139 | + assertSame(cause, e.getCause()); |
| 140 | + } |
| 141 | +} |
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