Use macro per-test-file

Signed-off-by: Marcel Müller <neikos@neikos.email>

tests/cases/if_else_if.1-parsed.snap

@@ -0,0 +1,41 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+info:
+  input: "{{ if test }}\n    Not Hello World! :C\n{{ else if another_test }}\n    Hello World!\n{{ end }}"
+  context:
+    test: false
+    stuff: more
+    another_test: true
+---
+ParsedTemplate {
+    tokens: [
+        [LeftDelim]"{{" (0..2),
+        [Whitespace]" " (2..3),
+        [ConditionalIf]"if" (3..5),
+        [Whitespace]" " (5..6),
+        [Ident]"test" (6..10),
+        [Whitespace]" " (10..11),
+        [RightDelim]"}}" (11..13),
+        [Whitespace]"\n    " (13..18),
+        [Content]"Not Hello World! :C" (18..37),
+        [Whitespace]"\n" (37..38),
+        [LeftDelim]"{{" (38..40),
+        [Whitespace]" " (40..41),
+        [ConditionalElse]"else" (41..45),
+        [Whitespace]" " (45..46),
+        [ConditionalIf]"if" (46..48),
+        [Whitespace]" " (48..49),
+        [Ident]"another_test" (49..61),
+        [Whitespace]" " (61..62),
+        [RightDelim]"}}" (62..64),
+        [Whitespace]"\n    " (64..69),
+        [Content]"Hello World!" (69..81),
+        [Whitespace]"\n" (81..82),
+        [LeftDelim]"{{" (82..84),
+        [Whitespace]" " (84..85),
+        [End]"end" (85..88),
+        [Whitespace]" " (88..89),
+        [RightDelim]"}}" (89..91),
+    ],
+}