Add exhaustive whitespace tests for for-else

testing/tests/gen_loop_else.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+print(r'''use askama::Template;
+
+#[derive(Template)]
+#[template(
+    source = "{% for v in values %}{{v}}{% else %}empty{% endfor %}",
+    ext = "txt"
+)]
+struct ForElse<'a> {
+    values: &'a [i32],
+}
+
+#[test]
+fn test_for_else() {
+    let t = ForElse { values: &[1, 2, 3] };
+    assert_eq!(t.render().unwrap(), "123");
+
+    let t = ForElse { values: &[] };
+    assert_eq!(t.render().unwrap(), "empty");
+}
+''')
+
+for i in range(2**6):
+    a = '-' if i & 2**0 else ' '
+    b = '-' if i & 2**1 else ' '
+    c = '-' if i & 2**2 else ' '
+    d = '-' if i & 2**3 else ' '
+    e = '-' if i & 2**4 else ' '
+    f = '-' if i & 2**5 else ' '
+    source = fr'a {{%{a}for v in values{b}%}}\t{{{{v}}}}\t{{%{c}else{d}%}}\nX\n{{%{e}endfor{f}%}} b'
+
+    a = '' if i & 2**0 else r' '
+    b = '' if i & 2**1 else r'\t'
+    c = '' if i & 2**2 else r'\t'
+    d = '' if i & 2**3 else r'\n'
+    e = '' if i & 2**4 else r'\n'
+    f = '' if i & 2**5 else r' '
+    some = f'a{a}{b}1{c}{f}b'
+    none = f'a{a}{d}X{e}{f}b'
+
+    print(f'''#[derive(Template)]
+#[template(
+    source = "{source}",
+    ext = "txt"
+)]
+struct LoopElseTrim{i:02}<'a> {{
+    values: &'a [i32],
+}}
+
+#[test]
+fn test_loop_else_trim{i:02}() {{
+    let t = LoopElseTrim{i:02} {{ values: &[1] }};
+    assert_eq!(t.render().unwrap(), "{some}");
+
+    let t = LoopElseTrim{i:02} {{ values: &[] }};
+    assert_eq!(t.render().unwrap(), "{none}");
+}}''')