1
exercism fetch fsharp forth

ForthTest.fs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
// This file was auto-generated based on version 1.4.0 of the canonical data.

module ForthTest

open FsUnit.Xunit
open Xunit

open Forth

[<Fact>]
let ``Parsing and numbers - numbers just get pushed onto the stack`` () =
    let expected = Some [1; 2; 3; 4; 5]
    evaluate ["1 2 3 4 5"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Addition - can add two numbers`` () =
    let expected = Some [3]
    evaluate ["1 2 +"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Addition - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["+"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Addition - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 +"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Subtraction - can subtract two numbers`` () =
    let expected = Some [-1]
    evaluate ["3 4 -"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Subtraction - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["-"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Subtraction - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 -"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Multiplication - can multiply two numbers`` () =
    let expected = Some [8]
    evaluate ["2 4 *"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Multiplication - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["*"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Multiplication - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 *"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Division - can divide two numbers`` () =
    let expected = Some [4]
    evaluate ["12 3 /"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Division - performs integer division`` () =
    let expected = Some [2]
    evaluate ["8 3 /"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Division - errors if dividing by zero`` () =
    let expected = None
    evaluate ["4 0 /"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Division - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["/"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Division - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 /"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Combined arithmetic - addition and subtraction`` () =
    let expected = Some [-1]
    evaluate ["1 2 + 4 -"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Combined arithmetic - multiplication and division`` () =
    let expected = Some [2]
    evaluate ["2 4 * 3 /"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Dup - copies a value on the stack`` () =
    let expected = Some [1; 1]
    evaluate ["1 dup"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Dup - copies the top value on the stack`` () =
    let expected = Some [1; 2; 2]
    evaluate ["1 2 dup"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Dup - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["dup"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Drop - removes the top value on the stack if it is the only one`` () =
    let expected: int list option = Some []
    evaluate ["1 drop"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Drop - removes the top value on the stack if it is not the only one`` () =
    let expected = Some [1]
    evaluate ["1 2 drop"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Drop - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["drop"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Swap - swaps the top two values on the stack if they are the only ones`` () =
    let expected = Some [2; 1]
    evaluate ["1 2 swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Swap - swaps the top two values on the stack if they are not the only ones`` () =
    let expected = Some [1; 3; 2]
    evaluate ["1 2 3 swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Swap - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Swap - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Over - copies the second element if there are only two`` () =
    let expected = Some [1; 2; 1]
    evaluate ["1 2 over"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Over - copies the second element if there are more than two`` () =
    let expected = Some [1; 2; 3; 2]
    evaluate ["1 2 3 over"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Over - errors if there is nothing on the stack`` () =
    let expected = None
    evaluate ["over"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Over - errors if there is only one value on the stack`` () =
    let expected = None
    evaluate ["1 over"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - can consist of built-in words`` () =
    let expected = Some [1; 1; 1]
    evaluate [": dup-twice dup dup ;"; "1 dup-twice"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - execute in the right order`` () =
    let expected = Some [1; 2; 3]
    evaluate [": countup 1 2 3 ;"; "countup"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - can override other user-defined words`` () =
    let expected = Some [1; 1; 1]
    evaluate [": foo dup ;"; ": foo dup dup ;"; "1 foo"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - can override built-in words`` () =
    let expected = Some [1; 1]
    evaluate [": swap dup ;"; "1 swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - can override built-in operators`` () =
    let expected = Some [12]
    evaluate [": + * ;"; "3 4 +"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - cannot redefine numbers`` () =
    let expected = None
    evaluate [": 1 2 ;"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``User-defined words - errors if executing a non-existent word`` () =
    let expected = None
    evaluate ["foo"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - DUP is case-insensitive`` () =
    let expected = Some [1; 1; 1; 1]
    evaluate ["1 DUP Dup dup"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - DROP is case-insensitive`` () =
    let expected = Some [1]
    evaluate ["1 2 3 4 DROP Drop drop"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - SWAP is case-insensitive`` () =
    let expected = Some [2; 3; 4; 1]
    evaluate ["1 2 SWAP 3 Swap 4 swap"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - OVER is case-insensitive`` () =
    let expected = Some [1; 2; 1; 2; 1]
    evaluate ["1 2 OVER Over over"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - user-defined words are case-insensitive`` () =
    let expected = Some [1; 1; 1; 1]
    evaluate [": foo dup ;"; "1 FOO Foo foo"] |> should equal expected

[<Fact(Skip = "Remove to run test")>]
let ``Case-insensitivity - definitions are case-insensitive`` () =
    let expected = Some [1; 1; 1; 1]
    evaluate [": SWAP DUP Dup dup ;"; "1 swap"] |> should equal expected