From 802d356a35232e78635098563604d21df3aa3ddc Mon Sep 17 00:00:00 2001
From: Eugene Rossokha <hsugeneyos@gmail.com>
Date: Wed, 20 Dec 2023 00:00:07 +0200
Subject: [PATCH] Pull out codegen tests into a separate module

---
 backend/src/codegen.rs       | 367 ----------------------------------
 backend/src/codegen_tests.rs | 368 +++++++++++++++++++++++++++++++++++
 backend/src/lib.rs           |   3 +
 3 files changed, 371 insertions(+), 367 deletions(-)
 create mode 100644 backend/src/codegen_tests.rs

diff --git a/backend/src/codegen.rs b/backend/src/codegen.rs
index db507a1..d51cc93 100644
--- a/backend/src/codegen.rs
+++ b/backend/src/codegen.rs
@@ -303,370 +303,3 @@ impl<W: Write> Emit<W> for Expression {
         }
     }
 }
-
-#[test]
-fn null_emit() {
-    let null = Expression::Null;
-    let mut res = String::new();
-    null.emit(&mut res).unwrap();
-    assert_eq!(res, "null")
-}
-
-#[test]
-fn undefined_emit() {
-    let undefined = Expression::Undefined;
-    let mut res = String::new();
-    undefined.emit(&mut res).unwrap();
-    assert_eq!(res, "undefined")
-}
-
-#[test]
-fn true_emit() {
-    let true_ = Expression::Bool(true);
-    let mut res = String::new();
-    true_.emit(&mut res).unwrap();
-    assert_eq!(res, "true")
-}
-
-#[test]
-fn false_emit() {
-    let false_ = Expression::Bool(false);
-    let mut res = String::new();
-    false_.emit(&mut res).unwrap();
-    assert_eq!(res, "false")
-}
-
-#[test]
-fn number_emit() {
-    let one = Expression::Number(1.0);
-    let mut res = String::new();
-    one.emit(&mut res).unwrap();
-    assert_eq!(res, "1")
-}
-
-#[test]
-fn negative_number_emit() {
-    let maybe_one = Expression::Number(-1.5);
-    let mut res = String::new();
-    maybe_one.emit(&mut res).unwrap();
-    assert_eq!(res, "-1.5")
-}
-
-#[test]
-fn string_emit() {
-    let string = Expression::String("test".to_owned());
-    let mut res = String::new();
-    string.emit(&mut res).unwrap();
-    assert_eq!(res, "\"test\"")
-}
-
-#[test]
-fn reference_emit() {
-    let string = Expression::Reference("x".to_owned());
-    let mut res = String::new();
-    string.emit(&mut res).unwrap();
-    assert_eq!(res, "x")
-}
-
-#[test]
-fn empty_array_emit() {
-    let array = Expression::Array(Vec::new());
-    let mut res = String::new();
-    array.emit(&mut res).unwrap();
-    assert_eq!(res, "[]")
-}
-
-#[test]
-fn one_elem_array_emit() {
-    let array = Expression::Array(vec![Expression::Null]);
-    let mut res = String::new();
-    array.emit(&mut res).unwrap();
-    assert_eq!(res, "[null]")
-}
-
-#[test]
-fn two_elems_array_emit() {
-    let array = Expression::Array(vec![Expression::Null, Expression::Undefined]);
-    let mut res = String::new();
-    array.emit(&mut res).unwrap();
-    assert_eq!(res, "[null, undefined]")
-}
-
-#[test]
-fn empty_object_emit() {
-    let object = Expression::Object(Vec::new());
-    let mut res = String::new();
-    object.emit(&mut res).unwrap();
-    assert_eq!(res, "{}")
-}
-
-#[test]
-fn one_elem_object_emit() {
-    let object = Expression::Object(vec![("x".to_owned(), Expression::Null)]);
-    let mut res = String::new();
-    object.emit(&mut res).unwrap();
-    assert_eq!(res, "{\"x\": null}")
-}
-
-#[test]
-fn two_elems_object_emit() {
-    let object = Expression::Object(vec![
-        ("x".to_owned(), Expression::Null),
-        ("y as z".to_owned(), Expression::Undefined),
-    ]);
-    let mut res = String::new();
-    object.emit(&mut res).unwrap();
-    assert_eq!(res, "{\"x\": null, \"y as z\": undefined}")
-}
-
-#[test]
-fn unary_plus_emit() {
-    let unary = Expression::Unary("+".to_owned(), Box::new(Expression::Null));
-    let mut res = String::new();
-    unary.emit(&mut res).unwrap();
-    assert_eq!(res, "(+ null)")
-}
-
-#[test]
-fn unary_plus_plus_emit() {
-    let unary = Expression::Unary("++".to_owned(), Box::new(Expression::Null));
-    let mut res = String::new();
-    unary.emit(&mut res).unwrap();
-    assert_eq!(res, "(null ++)")
-}
-
-#[test]
-fn binary_plus_emit() {
-    let binary = Expression::Binary(
-        "+".to_owned(),
-        Box::new(Expression::Null),
-        Box::new(Expression::Undefined),
-    );
-    let mut res = String::new();
-    binary.emit(&mut res).unwrap();
-    assert_eq!(res, "(null + undefined)")
-}
-
-#[test]
-fn ternary_emit() {
-    let ternary = Expression::Ternary(
-        Box::new(Expression::Bool(true)),
-        Box::new(Expression::Null),
-        Box::new(Expression::Undefined),
-    );
-    let mut res = String::new();
-    ternary.emit(&mut res).unwrap();
-    assert_eq!(res, "(true ? null : undefined)")
-}
-
-#[test]
-fn empty_lambda_emit() {
-    let lambda = Expression::Lambda {
-        args: Vec::new(),
-        body: Vec::new(),
-        is_async: false,
-    };
-    let mut res = String::new();
-    lambda.emit(&mut res).unwrap();
-    assert_eq!(res, "() => {}")
-}
-
-#[test]
-fn empty_async_lambda_emit() {
-    let lambda = Expression::Lambda {
-        args: Vec::new(),
-        body: Vec::new(),
-        is_async: true,
-    };
-    let mut res = String::new();
-    lambda.emit(&mut res).unwrap();
-    assert_eq!(res, "async () => {}")
-}
-
-#[test]
-fn id_lambda_emit() {
-    let lambda = Expression::Lambda {
-        args: vec!["x".to_owned()],
-        body: vec![Statement::Expression(Expression::Reference("x".to_owned()))],
-        is_async: false,
-    };
-    let mut res = String::new();
-    lambda.emit(&mut res).unwrap();
-    assert_eq!(res, "(x) => {x}")
-}
-
-#[test]
-fn return_emit() {
-    let ret = Statement::Return(Expression::Null);
-    let mut res = String::new();
-    ret.emit(&mut res).unwrap();
-    assert_eq!(res, "return null")
-}
-
-#[test]
-fn let_declaration_emit() {
-    let decl = Statement::Declaration {
-        is_const: false,
-        is_exported: false,
-        name: "x".to_owned(),
-        initial: None,
-    };
-    let mut res = String::new();
-    decl.emit(&mut res).unwrap();
-    assert_eq!(res, "let x")
-}
-
-#[test]
-fn export_declaration_emit() {
-    let decl = Statement::Declaration {
-        is_const: false,
-        is_exported: true,
-        name: "x".to_owned(),
-        initial: None,
-    };
-    let mut res = String::new();
-    decl.emit(&mut res).unwrap();
-    assert_eq!(res, "export let x")
-}
-
-#[test]
-fn const_declaration_emit() {
-    let decl = Statement::Declaration {
-        is_const: true,
-        is_exported: false,
-        name: "x".to_owned(),
-        initial: Some(Expression::Null),
-    };
-    let mut res = String::new();
-    decl.emit(&mut res).unwrap();
-    assert_eq!(res, "const x = null")
-}
-
-#[test]
-fn throw_emit() {
-    let throw = Statement::Throw(Expression::Null);
-    let mut res = String::new();
-    throw.emit(&mut res).unwrap();
-    assert_eq!(res, "throw null")
-}
-
-#[test]
-fn empty_try_emit() {
-    let try_ = Statement::Try {
-        body: Vec::new(),
-        catch_: None,
-        finally: None,
-    };
-    let mut res = String::new();
-    try_.emit(&mut res).unwrap();
-    assert_eq!(res, "try {}")
-}
-
-#[test]
-fn try_emit() {
-    let try_ = Statement::Try {
-        body: vec![Statement::Expression(Expression::Null)],
-        catch_: Some((
-            "e".to_owned(),
-            vec![Statement::Expression(Expression::Undefined)],
-        )),
-        finally: Some(vec![Statement::Expression(Expression::Null)]),
-    };
-    let mut res = String::new();
-    try_.emit(&mut res).unwrap();
-    assert_eq!(res, "try {null} catch (e) {undefined} finally {null}")
-}
-
-#[test]
-fn empty_for_emit() {
-    let for_ = Statement::For {
-        init: None,
-        condition: None,
-        update: None,
-        body: Vec::new(),
-    };
-    let mut res = String::new();
-    for_.emit(&mut res).unwrap();
-    assert_eq!(res, "for (; ; ) {}")
-}
-
-#[test]
-fn for_emit() {
-    let for_ = Statement::For {
-        init: Some(Expression::Null),
-        condition: Some(Expression::Bool(true)),
-        update: Some(Expression::Null),
-        body: vec![Statement::Expression(Expression::Null)],
-    };
-    let mut res = String::new();
-    for_.emit(&mut res).unwrap();
-    assert_eq!(res, "for (null; true; null) {null}")
-}
-
-#[test]
-fn empty_while_emit() {
-    let while_ = Statement::While {
-        condition: Expression::Bool(true),
-        body: Vec::new(),
-    };
-    let mut res = String::new();
-    while_.emit(&mut res).unwrap();
-    assert_eq!(res, "while (true) {}")
-}
-
-#[test]
-fn while_emit() {
-    let while_ = Statement::While {
-        condition: Expression::Bool(true),
-        body: vec![Statement::Expression(Expression::Null)],
-    };
-    let mut res = String::new();
-    while_.emit(&mut res).unwrap();
-    assert_eq!(res, "while (true) {null}")
-}
-
-#[test]
-fn empty_if_emit() {
-    let if_ = Statement::If {
-        condition: Expression::Bool(true),
-        then_: Vec::new(),
-        else_: None,
-    };
-    let mut res = String::new();
-    if_.emit(&mut res).unwrap();
-    assert_eq!(res, "if (true) {}")
-}
-
-#[test]
-fn if_emit() {
-    let if_ = Statement::If {
-        condition: Expression::Bool(true),
-        then_: vec![Statement::Expression(Expression::Null)],
-        else_: Some(vec![Statement::Expression(Expression::Undefined)]),
-    };
-    let mut res = String::new();
-    if_.emit(&mut res).unwrap();
-    assert_eq!(res, "if (true) {null} else {undefined}")
-}
-
-#[test]
-fn empty_import_emit() {
-    let import = Statement::Import {
-        names: Vec::new(),
-        from: "x".to_owned(),
-    };
-    let mut res = String::new();
-    import.emit(&mut res).unwrap();
-    assert_eq!(res, "import {} from x;")
-}
-
-#[test]
-fn import_emit() {
-    let import = Statement::Import {
-        names: vec!["x".to_owned(), "y".to_owned()],
-        from: "z".to_owned(),
-    };
-    let mut res = String::new();
-    import.emit(&mut res).unwrap();
-    assert_eq!(res, "import {x, y} from z;")
-}
diff --git a/backend/src/codegen_tests.rs b/backend/src/codegen_tests.rs
new file mode 100644
index 0000000..af0f480
--- /dev/null
+++ b/backend/src/codegen_tests.rs
@@ -0,0 +1,368 @@
+use crate::codegen::{Emit, Expression, Statement};
+
+#[test]
+fn null_emit() {
+    let null = Expression::Null;
+    let mut res = String::new();
+    null.emit(&mut res).unwrap();
+    assert_eq!(res, "null")
+}
+
+#[test]
+fn undefined_emit() {
+    let undefined = Expression::Undefined;
+    let mut res = String::new();
+    undefined.emit(&mut res).unwrap();
+    assert_eq!(res, "undefined")
+}
+
+#[test]
+fn true_emit() {
+    let true_ = Expression::Bool(true);
+    let mut res = String::new();
+    true_.emit(&mut res).unwrap();
+    assert_eq!(res, "true")
+}
+
+#[test]
+fn false_emit() {
+    let false_ = Expression::Bool(false);
+    let mut res = String::new();
+    false_.emit(&mut res).unwrap();
+    assert_eq!(res, "false")
+}
+
+#[test]
+fn number_emit() {
+    let one = Expression::Number(1.0);
+    let mut res = String::new();
+    one.emit(&mut res).unwrap();
+    assert_eq!(res, "1")
+}
+
+#[test]
+fn negative_number_emit() {
+    let maybe_one = Expression::Number(-1.5);
+    let mut res = String::new();
+    maybe_one.emit(&mut res).unwrap();
+    assert_eq!(res, "-1.5")
+}
+
+#[test]
+fn string_emit() {
+    let string = Expression::String("test".to_owned());
+    let mut res = String::new();
+    string.emit(&mut res).unwrap();
+    assert_eq!(res, "\"test\"")
+}
+
+#[test]
+fn reference_emit() {
+    let string = Expression::Reference("x".to_owned());
+    let mut res = String::new();
+    string.emit(&mut res).unwrap();
+    assert_eq!(res, "x")
+}
+
+#[test]
+fn empty_array_emit() {
+    let array = Expression::Array(Vec::new());
+    let mut res = String::new();
+    array.emit(&mut res).unwrap();
+    assert_eq!(res, "[]")
+}
+
+#[test]
+fn one_elem_array_emit() {
+    let array = Expression::Array(vec![Expression::Null]);
+    let mut res = String::new();
+    array.emit(&mut res).unwrap();
+    assert_eq!(res, "[null]")
+}
+
+#[test]
+fn two_elems_array_emit() {
+    let array = Expression::Array(vec![Expression::Null, Expression::Undefined]);
+    let mut res = String::new();
+    array.emit(&mut res).unwrap();
+    assert_eq!(res, "[null, undefined]")
+}
+
+#[test]
+fn empty_object_emit() {
+    let object = Expression::Object(Vec::new());
+    let mut res = String::new();
+    object.emit(&mut res).unwrap();
+    assert_eq!(res, "{}")
+}
+
+#[test]
+fn one_elem_object_emit() {
+    let object = Expression::Object(vec![("x".to_owned(), Expression::Null)]);
+    let mut res = String::new();
+    object.emit(&mut res).unwrap();
+    assert_eq!(res, "{\"x\": null}")
+}
+
+#[test]
+fn two_elems_object_emit() {
+    let object = Expression::Object(vec![
+        ("x".to_owned(), Expression::Null),
+        ("y as z".to_owned(), Expression::Undefined),
+    ]);
+    let mut res = String::new();
+    object.emit(&mut res).unwrap();
+    assert_eq!(res, "{\"x\": null, \"y as z\": undefined}")
+}
+
+#[test]
+fn unary_plus_emit() {
+    let unary = Expression::Unary("+".to_owned(), Box::new(Expression::Null));
+    let mut res = String::new();
+    unary.emit(&mut res).unwrap();
+    assert_eq!(res, "(+ null)")
+}
+
+#[test]
+fn unary_plus_plus_emit() {
+    let unary = Expression::Unary("++".to_owned(), Box::new(Expression::Null));
+    let mut res = String::new();
+    unary.emit(&mut res).unwrap();
+    assert_eq!(res, "(null ++)")
+}
+
+#[test]
+fn binary_plus_emit() {
+    let binary = Expression::Binary(
+        "+".to_owned(),
+        Box::new(Expression::Null),
+        Box::new(Expression::Undefined),
+    );
+    let mut res = String::new();
+    binary.emit(&mut res).unwrap();
+    assert_eq!(res, "(null + undefined)")
+}
+
+#[test]
+fn ternary_emit() {
+    let ternary = Expression::Ternary(
+        Box::new(Expression::Bool(true)),
+        Box::new(Expression::Null),
+        Box::new(Expression::Undefined),
+    );
+    let mut res = String::new();
+    ternary.emit(&mut res).unwrap();
+    assert_eq!(res, "(true ? null : undefined)")
+}
+
+#[test]
+fn empty_lambda_emit() {
+    let lambda = Expression::Lambda {
+        args: Vec::new(),
+        body: Vec::new(),
+        is_async: false,
+    };
+    let mut res = String::new();
+    lambda.emit(&mut res).unwrap();
+    assert_eq!(res, "() => {}")
+}
+
+#[test]
+fn empty_async_lambda_emit() {
+    let lambda = Expression::Lambda {
+        args: Vec::new(),
+        body: Vec::new(),
+        is_async: true,
+    };
+    let mut res = String::new();
+    lambda.emit(&mut res).unwrap();
+    assert_eq!(res, "async () => {}")
+}
+
+#[test]
+fn id_lambda_emit() {
+    let lambda = Expression::Lambda {
+        args: vec!["x".to_owned()],
+        body: vec![Statement::Expression(Expression::Reference("x".to_owned()))],
+        is_async: false,
+    };
+    let mut res = String::new();
+    lambda.emit(&mut res).unwrap();
+    assert_eq!(res, "(x) => {x}")
+}
+
+#[test]
+fn return_emit() {
+    let ret = Statement::Return(Expression::Null);
+    let mut res = String::new();
+    ret.emit(&mut res).unwrap();
+    assert_eq!(res, "return null")
+}
+
+#[test]
+fn let_declaration_emit() {
+    let decl = Statement::Declaration {
+        is_const: false,
+        is_exported: false,
+        name: "x".to_owned(),
+        initial: None,
+    };
+    let mut res = String::new();
+    decl.emit(&mut res).unwrap();
+    assert_eq!(res, "let x")
+}
+
+#[test]
+fn export_declaration_emit() {
+    let decl = Statement::Declaration {
+        is_const: false,
+        is_exported: true,
+        name: "x".to_owned(),
+        initial: None,
+    };
+    let mut res = String::new();
+    decl.emit(&mut res).unwrap();
+    assert_eq!(res, "export let x")
+}
+
+#[test]
+fn const_declaration_emit() {
+    let decl = Statement::Declaration {
+        is_const: true,
+        is_exported: false,
+        name: "x".to_owned(),
+        initial: Some(Expression::Null),
+    };
+    let mut res = String::new();
+    decl.emit(&mut res).unwrap();
+    assert_eq!(res, "const x = null")
+}
+
+#[test]
+fn throw_emit() {
+    let throw = Statement::Throw(Expression::Null);
+    let mut res = String::new();
+    throw.emit(&mut res).unwrap();
+    assert_eq!(res, "throw null")
+}
+
+#[test]
+fn empty_try_emit() {
+    let try_ = Statement::Try {
+        body: Vec::new(),
+        catch_: None,
+        finally: None,
+    };
+    let mut res = String::new();
+    try_.emit(&mut res).unwrap();
+    assert_eq!(res, "try {}")
+}
+
+#[test]
+fn try_emit() {
+    let try_ = Statement::Try {
+        body: vec![Statement::Expression(Expression::Null)],
+        catch_: Some((
+            "e".to_owned(),
+            vec![Statement::Expression(Expression::Undefined)],
+        )),
+        finally: Some(vec![Statement::Expression(Expression::Null)]),
+    };
+    let mut res = String::new();
+    try_.emit(&mut res).unwrap();
+    assert_eq!(res, "try {null} catch (e) {undefined} finally {null}")
+}
+
+#[test]
+fn empty_for_emit() {
+    let for_ = Statement::For {
+        init: None,
+        condition: None,
+        update: None,
+        body: Vec::new(),
+    };
+    let mut res = String::new();
+    for_.emit(&mut res).unwrap();
+    assert_eq!(res, "for (; ; ) {}")
+}
+
+#[test]
+fn for_emit() {
+    let for_ = Statement::For {
+        init: Some(Expression::Null),
+        condition: Some(Expression::Bool(true)),
+        update: Some(Expression::Null),
+        body: vec![Statement::Expression(Expression::Null)],
+    };
+    let mut res = String::new();
+    for_.emit(&mut res).unwrap();
+    assert_eq!(res, "for (null; true; null) {null}")
+}
+
+#[test]
+fn empty_while_emit() {
+    let while_ = Statement::While {
+        condition: Expression::Bool(true),
+        body: Vec::new(),
+    };
+    let mut res = String::new();
+    while_.emit(&mut res).unwrap();
+    assert_eq!(res, "while (true) {}")
+}
+
+#[test]
+fn while_emit() {
+    let while_ = Statement::While {
+        condition: Expression::Bool(true),
+        body: vec![Statement::Expression(Expression::Null)],
+    };
+    let mut res = String::new();
+    while_.emit(&mut res).unwrap();
+    assert_eq!(res, "while (true) {null}")
+}
+
+#[test]
+fn empty_if_emit() {
+    let if_ = Statement::If {
+        condition: Expression::Bool(true),
+        then_: Vec::new(),
+        else_: None,
+    };
+    let mut res = String::new();
+    if_.emit(&mut res).unwrap();
+    assert_eq!(res, "if (true) {}")
+}
+
+#[test]
+fn if_emit() {
+    let if_ = Statement::If {
+        condition: Expression::Bool(true),
+        then_: vec![Statement::Expression(Expression::Null)],
+        else_: Some(vec![Statement::Expression(Expression::Undefined)]),
+    };
+    let mut res = String::new();
+    if_.emit(&mut res).unwrap();
+    assert_eq!(res, "if (true) {null} else {undefined}")
+}
+
+#[test]
+fn empty_import_emit() {
+    let import = Statement::Import {
+        names: Vec::new(),
+        from: "x".to_owned(),
+    };
+    let mut res = String::new();
+    import.emit(&mut res).unwrap();
+    assert_eq!(res, "import {} from x;")
+}
+
+#[test]
+fn import_emit() {
+    let import = Statement::Import {
+        names: vec!["x".to_owned(), "y".to_owned()],
+        from: "z".to_owned(),
+    };
+    let mut res = String::new();
+    import.emit(&mut res).unwrap();
+    assert_eq!(res, "import {x, y} from z;")
+}
diff --git a/backend/src/lib.rs b/backend/src/lib.rs
index 24ccbdd..015365e 100644
--- a/backend/src/lib.rs
+++ b/backend/src/lib.rs
@@ -1 +1,4 @@
 pub mod codegen;
+
+#[cfg(test)]
+mod codegen_tests;