Setup a testing bench

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

tests/cases/ast@interpolation.snap

@@ -0,0 +1,42 @@
+---
+source: tests/file_tests.rs
+expression: ast
+input_file: tests/cases/interpolation.temple
+---
+TemplateAst {
+    root: [
+        StaticContent(
+            TemplateToken {
+                kind: Content,
+                source: "Hello! I'm",
+            },
+        ),
+        Interpolation {
+            prev_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: " ",
+                },
+            ),
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "name",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+    ],
+}

tests/cases/ast@simple.snap

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+---
+source: tests/file_tests.rs
+expression: ast
+input_file: tests/cases/simple.temple
+---
+TemplateAst {
+    root: [
+        StaticContent(
+            TemplateToken {
+                kind: Content,
+                source: "Hello World!
+                ",
+            },
+        ),
+    ],
+}

tests/cases/instructions@interpolation.snap

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+---
+source: tests/file_tests.rs
+expression: emit
+input_file: tests/cases/interpolation.temple
+---
+[
+    AppendContent {
+        content: "Hello! I'm",
+    },
+    AppendContent {
+        content: " ",
+    },
+    LoadFromContextToSlot {
+        name: "name",
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+]

tests/cases/instructions@simple.snap

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+---
+source: tests/file_tests.rs
+expression: emit
+input_file: tests/cases/simple.temple
+---
+[
+    AppendContent {
+        content: "Hello World!
+        ",
+    },
+]

tests/cases/interpolation.temple

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+{
+    "name": "Hemera"
+}
+---
+Hello! I'm {{= name }}

tests/cases/output@interpolation.snap

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+---
+source: tests/file_tests.rs
+expression: output
+input_file: tests/cases/interpolation.temple
+---
+"Hello! I'm Hemera\n"

tests/cases/output@simple.snap

@@ -0,0 +1,6 @@
+---
+source: tests/file_tests.rs
+expression: output
+input_file: tests/cases/simple.temple
+---
+"Hello World!\n"

tests/cases/parsed@interpolation.snap

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+---
+source: tests/file_tests.rs
+expression: parsed
+input_file: tests/cases/interpolation.temple
+---
+ParsedTemplate {
+    tokens: [
+        TemplateToken {
+            kind: Content,
+            source: "Hello! I'm",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "name",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+    ],
+}

tests/cases/parsed@simple.snap

@@ -0,0 +1,14 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+input_file: tests/cases/simple.temple
+---
+ParsedTemplate {
+    tokens: [
+        TemplateToken {
+            kind: Content,
+            source: "Hello World!
+            ",
+        },
+    ],
+}

tests/cases/simple.temple

@@ -0,0 +1 @@
+Hello World!

tests/file_tests.rs

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+use std::collections::HashMap;
+
+use temple::Context;
+
+#[test]
+fn check_cases() {
+    insta::glob!("cases/*.temple", |path| {
+        let mut settings = insta::Settings::clone_current();
+        settings.set_snapshot_path("cases");
+        settings.set_snapshot_suffix(path.file_stem().unwrap().display().to_string());
+        settings.set_prepend_module_to_snapshot(false);
+        let _guard = settings.bind_to_scope();
+
+        let input = std::fs::read_to_string(path).unwrap();
+
+        let (context, input) = input.split_once("\n---\n").unwrap_or_else(|| ("", &input));
+
+        let map = if !context.is_empty() {
+            serde_json::from_str::<HashMap<String, serde_json::Value>>(context).unwrap()
+        } else {
+            HashMap::new()
+        };
+
+        let mut context = Context::new();
+
+        for (k, v) in map {
+            context.insert(k, v);
+        }
+
+        let parsed = temple::parser::parse(input.into()).unwrap();
+
+        insta::assert_debug_snapshot!("parsed", parsed);
+
+        let ast = temple::ast::parse(parsed.tokens()).unwrap();
+
+        insta::assert_debug_snapshot!("ast", ast);
+
+        let emit = temple::emit::emit_machine(ast);
+
+        insta::assert_debug_snapshot!("instructions", emit);
+
+        let output = temple::eval::execute(&emit, &context).unwrap();
+
+        insta::assert_debug_snapshot!("output", output);
+    });
+}