alef 0.84.0

Opinionated polyglot binding generator for Rust libraries
Documentation 
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
230
231
232
233
234
235
236

//! Coverage for the ancestor-prefix guard in `test_function.rs`'s assertion loop: when an
//! assertion's field crosses an optional ANCESTOR (not the field itself), the emitted
//! `if <ancestor> != nil { ... }` wrap must fail the test on a nil ancestor unless a sibling
//! `not_empty` assertion on that exact ancestor path already covers presence.
//!
//! Field paths here mirror the real `results[0].metadata....` shape (an outer, always-present
//! array index over an inner optional struct) rather than a bare optional field, because the
//! wrap this file covers only fires when the ancestor accessor itself contains a bracket --
//! see `is_struct_value` in `test_function.rs`. A bare optional field with no array ancestor
//! (e.g. plain `metadata`) takes a different, unguarded rendering path entirely.
//!
//! Split out of `tests.rs`, which is over the 1000-line cap and may not grow.

use crate::e2e::config::{CallConfig, E2eConfig};
use crate::e2e::fixture::{Assertion, Fixture};

use super::test_function::{GoTestFunctionContext, render_test_function};

fn base_fixture(id: &str, assertions: Vec<Assertion>) -> Fixture {
    Fixture {
        docs: None,
        requirements: Vec::new(),
        id: id.to_string(),
        category: None,
        description: "test fixture".to_string(),
        tags: vec![],
        skip: None,
        env: None,
        setup: Vec::new(),
        call: None,
        input: serde_json::Value::Null,
        mock_response: Some(crate::e2e::fixture::MockResponse {
            status: 200,
            body: Some(serde_json::Value::Null),
            stream_chunks: None,
            headers: std::collections::BTreeMap::new(),
        }),
        source: String::new(),
        http: None,
        asyncapi: None,
        websocket: None,
        preserve_input_urls: false,
        assertions,
        visitor: None,
        args: vec![],
        assertion_recipes: vec![],
    }
}

fn render(fixture: &Fixture, optional_fields: &[&str]) -> String {
    let e2e_config = E2eConfig {
        call: CallConfig {
            function: "extract".to_string(),
            module: "github.com/example/mylib".to_string(),
            result_var: "result".to_string(),
            returns_result: true,
            ..CallConfig::default()
        },
        fields_optional: optional_fields.iter().map(|f| f.to_string()).collect(),
        fields_array: std::iter::once("results".to_string()).collect(),
        ..E2eConfig::default()
    };

    let mut out = String::new();
    let config = crate::core::config::ResolvedCrateConfig::default();
    let type_defs: Vec<crate::core::ir::TypeDef> = Vec::new();
    let enums: Vec<crate::core::ir::EnumDef> = Vec::new();
    render_test_function(
        &mut out,
        fixture,
        GoTestFunctionContext {
            import_alias: "pkg",
            e2e_config: &e2e_config,
            adapters: &[],
            data_enum_names: &std::collections::HashSet::new(),
            config: &config,
            type_defs: &type_defs,
            enums: &enums,
            errors: &[],
            functions: &[],
        },
    );
    out
}

/// `results[0].metadata` is optional and no sibling `not_empty` asserts its presence: the
/// `equals` assertion on `results[0].metadata.title`, wrapped in
/// `if result.Results[0].Metadata != nil { ... }`, must gain a failing `else` -- without it a
/// nil `Metadata` silently passes the test on exactly the regression the assertion exists to
/// catch.
#[test]
fn ancestor_guard_without_sibling_presence_fails_on_nil() {
    let fixture = base_fixture(
        "edge_metadata_title",
        vec![
            Assertion {
                assertion_type: "not_error".to_string(),
                ..Default::default()
            },
            Assertion {
                assertion_type: "equals".to_string(),
                field: Some("results[0].metadata.title".to_string()),
                value: Some(serde_json::Value::String("Simple Table Test".to_string())),
                ..Default::default()
            },
        ],
    );

    let out = render(&fixture, &["results[0].metadata"]);

    assert!(
        out.contains("if result.Results[0].Metadata != nil {"),
        "expected an ancestor guard on Results[0].Metadata; got:\n{out}"
    );
    assert!(
        out.contains(
            "} else {\n\t\tt.Errorf(\"expected %s to be present, got nil\", `result.Results[0].Metadata`)\n\t}"
        ),
        "expected a failing else branch naming the nil ancestor; got:\n{out}"
    );
}

/// Identical shape to the test above, except a sibling `not_empty` on the exact ancestor
/// path (`results[0].metadata`) already fails the test when `Metadata` is nil. The `equals`
/// assertion's wrap must stay guard-only -- an `else` here would only duplicate that failure.
#[test]
fn ancestor_guard_with_sibling_presence_check_stays_guard_only() {
    let fixture = base_fixture(
        "edge_metadata_title_with_not_empty",
        vec![
            Assertion {
                assertion_type: "not_error".to_string(),
                ..Default::default()
            },
            Assertion {
                assertion_type: "not_empty".to_string(),
                field: Some("results[0].metadata".to_string()),
                ..Default::default()
            },
            Assertion {
                assertion_type: "equals".to_string(),
                field: Some("results[0].metadata.title".to_string()),
                value: Some(serde_json::Value::String("Simple Table Test".to_string())),
                ..Default::default()
            },
        ],
    );

    let out = render(&fixture, &["results[0].metadata"]);

    // The `not_empty` assertion on `results[0].metadata` itself already fails on nil; the
    // `equals` assertion's ancestor wrap must not add a second, duplicate failure.
    assert!(
        !out.contains("expected %s to be present, got nil"),
        "sibling not_empty on the exact ancestor should suppress the failing else; got:\n{out}"
    );
    // The full guard-only block, byte for byte -- including the unrelated `len(result.Results)
    // == 0` non-empty precondition every `results[0]...`-anchored assertion carries (target.rs's
    // `array_guard`, triggered by the literal `[0]` in the field expression). That precondition
    // is orthogonal to this fix; pinning it here just keeps the expectation honest about what
    // the wrap actually contains, rather than a substring that happens to still match once it's
    // there. ~keep
    let expected_lines = [
        "\tif result.Results[0].Metadata != nil {",
        "\t\tif len(result.Results) == 0 {",
        "\t\t\tt.Fatalf(\"expected non-empty %s\", `result.Results`)",
        "\t\t}",
        "\t\tif string(result.Results[0].Metadata.Title) != `Simple Table Test` {",
        "\t\t\tt.Errorf(\"equals mismatch: got %v\", result.Results[0].Metadata.Title)",
        "\t\t}",
        "\t}",
    ];
    let expected = expected_lines.join("\n");
    assert!(
        out.contains(expected.as_str()),
        "expected the equals assertion to stay guard-only inside the ancestor wrap; got:\n{out}"
    );
}

/// `results[0].metadata` (the ancestor) AND `results[0].metadata.score` (the leaf) are
/// independently optional. The ancestor wrap's new failing `else` must nest cleanly around
/// the leaf's own guard-only nullable check (a genuinely optional value with no presence
/// claim, the same exemption `QualityScore` gets) without emitting two competing `else`
/// branches or breaking the block structure.
///
/// No `type_defs`/`enums` are wired into this harness, so `target_field_is_pointer` (the
/// IR-anchored answer `comparisons.rs` needs to add a `*` deref) resolves `None` -> `false`
/// here regardless of `fields_optional` -- unlike a real fixture (e.g. `SheetCount`), the
/// leaf's own guard checks `!= nil` without dereferencing. That does not affect what this
/// test is pinning: the ancestor wrap's nesting around whatever guard-only check the leaf
/// produces. ~keep
#[test]
fn nested_ancestor_and_field_guard_do_not_collide() {
    let fixture = base_fixture(
        "edge_metadata_score",
        vec![
            Assertion {
                assertion_type: "not_error".to_string(),
                ..Default::default()
            },
            Assertion {
                assertion_type: "greater_than_or_equal".to_string(),
                field: Some("results[0].metadata.score".to_string()),
                value: Some(serde_json::Value::from(0.5)),
                ..Default::default()
            },
        ],
    );

    let out = render(&fixture, &["results[0].metadata", "results[0].metadata.score"]);

    // As in the sibling-presence test above, the leaf's own comparison also carries a literal
    // `[0]`, so it too gets its own `len(result.Results) == 0` non-empty precondition (from
    // `target.rs`'s `array_guard`) ahead of the guard-only nullable check -- that block is
    // unrelated to this fix and is pinned here for the same honesty reason. ~keep
    let expected_lines = [
        "\tif result.Results[0].Metadata != nil {",
        "\t\tif len(result.Results) == 0 {",
        "\t\t\tt.Fatalf(\"expected non-empty %s\", `result.Results`)",
        "\t\t}",
        "\t\tif result.Results[0].Metadata.Score != nil {",
        "\t\t\tif result.Results[0].Metadata.Score < 0.5 {",
        "\t\t\t\tt.Errorf(\"expected >= 0.5, got %v\", result.Results[0].Metadata.Score)",
        "\t\t\t}",
        "\t\t}",
        "\t} else {",
        "\t\tt.Errorf(\"expected %s to be present, got nil\", `result.Results[0].Metadata`)",
        "\t}",
    ];
    let expected = expected_lines.join("\n");
    assert!(
        out.contains(expected.as_str()),
        "expected the outer ancestor guard's failing else to nest around the leaf's own \
         guard-only nullable check without a second else; got:\n{out}"
    );
}