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1
3 package test.jmock.examples.calculator;
4
5 import junit.framework.TestCase;
6 import org.jmock.examples.calculator.Lexer;
7 import org.jmock.examples.calculator.Token;
8
9
10 public class LexerTest
11 extends TestCase
12 {
13 public void testHasAStackOfPushBackTokens() throws Exception  {
14 Lexer lexer = new Lexer("");
15 lexer.pushBack(new Token(1, "1"));
16 lexer.pushBack(new Token(2, "2"));
17
18 assertNextToken(lexer, 2, "2");
19 assertNextToken(lexer, 1, "1");
20 assertNextToken(lexer, Token.END, null);
21 }
22
23 public void testTokenisesLiteralIntegerValues() throws Exception {
24 String input = "23";
25 Lexer lexer = new Lexer(input);
26
27 assertNextToken(lexer, Token.NUMBER, "23");
28 assertNextToken(lexer, Token.END, null);
29 }
30
31 public void testTokenisesLiteralRealValues() throws Exception {
32 String input = "123.45";
33 Lexer lexer = new Lexer(input);
34
35 assertNextToken(lexer, Token.NUMBER, "123.45");
36 assertNextToken(lexer, Token.END, null);
37 }
38
39 public void testTokenisesAddOperator() throws Exception {
40 Lexer lexer = new Lexer("1+2");
41
42 assertNextToken(lexer, Token.NUMBER, "1");
43 assertNextToken(lexer, Token.ADD, "+");
44 assertNextToken(lexer, Token.NUMBER, "2");
45 assertNextToken(lexer, Token.END, null);
46 }
47
48 public void testTokenisesSubtractOperator() throws Exception {
49 Lexer lexer = new Lexer("1-2");
50
51 assertNextToken(lexer, Token.NUMBER, "1");
52 assertNextToken(lexer, Token.SUBTRACT, "-");
53 assertNextToken(lexer, Token.NUMBER, "2");
54 assertNextToken(lexer, Token.END, null);
55 }
56
57 public void testTokenisesMultiplyOperator() throws Exception {
58 Lexer lexer = new Lexer("1*2");
59
60 assertNextToken(lexer, Token.NUMBER, "1");
61 assertNextToken(lexer, Token.MULTIPLY, "*");
62 assertNextToken(lexer, Token.NUMBER, "2");
63 assertNextToken(lexer, Token.END, null);
64 }
65
66 public void testTokenisesDivideOperator() throws Exception {
67 Lexer lexer = new Lexer("1/2");
68
69 assertNextToken(lexer, Token.NUMBER, "1");
70 assertNextToken(lexer, Token.DIVIDE, "/");
71 assertNextToken(lexer, Token.NUMBER, "2");
72 assertNextToken(lexer, Token.END, null);
73 }
74
75 public void testTokenisesPowerOperator() throws Exception {
76 Lexer lexer = new Lexer("1^2");
77
78 assertNextToken(lexer, Token.NUMBER, "1");
79 assertNextToken(lexer, Token.POWER, "^");
80 assertNextToken(lexer, Token.NUMBER, "2");
81 assertNextToken(lexer, Token.END, null);
82 }
83
84 public void testTokenisesIdentifiers() throws Exception {
85 Lexer lexer = new Lexer("identifier anotherIdentifier-identifier3");
86
87 assertNextToken(lexer, Token.IDENTIFIER, "identifier");
88 assertNextToken(lexer, Token.IDENTIFIER, "anotherIdentifier");
89 assertNextToken(lexer, Token.SUBTRACT, "-");
90 assertNextToken(lexer, Token.IDENTIFIER, "identifier3");
91 assertNextToken(lexer, Token.END, null);
92 }
93
94 public void testSkipsWhitespaceBetweenTokens() throws Exception {
95 String input = " 2 \t\n\r + 3";
96 Lexer lexer = new Lexer(input);
97
98 assertNextToken(lexer, Token.NUMBER, "2");
99 assertNextToken(lexer, Token.ADD, "+");
100 assertNextToken(lexer, Token.NUMBER, "3");
101 assertNextToken(lexer, Token.END, null);
102 }
103
104 public void testTokenisesParentheses() throws Exception {
105 Lexer lexer = new Lexer("(x+y)*z");
106
107 assertNextToken(lexer, Token.PAREN_OPEN, "(");
108 assertNextToken(lexer, Token.IDENTIFIER, "x");
109 assertNextToken(lexer, Token.ADD, "+");
110 assertNextToken(lexer, Token.IDENTIFIER, "y");
111 assertNextToken(lexer, Token.PAREN_CLOSE, ")");
112 assertNextToken(lexer, Token.MULTIPLY, "*");
113 assertNextToken(lexer, Token.IDENTIFIER, "z");
114 assertNextToken(lexer, Token.END, null);
115 }
116
117 private void assertNextToken( Lexer lexer, int tokenType, String tokenValue )
118 throws Exception {
119 Token token = lexer.nextToken();
120
121 assertEquals("token type", tokenType, token.getType());
122 assertEquals("token value", tokenValue, token.getValue());
123 }
124 }
125 |
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