feat: add new tests

tests/programs/neg_missing_operand.fzs

@@ -0,0 +1,2 @@
+printline(1 + );
+

tests/programs/neg_missing_semicolon.fzs

@@ -0,0 +1,3 @@
+int value = 42
+printline(value);
+

tests/programs/neg_unclosed_block.fzs

@@ -0,0 +1,4 @@
+if (true)
+{
+  printline("missing closing brace");
+

tests/programs/neg_unterminated_string.fzs

@@ -0,0 +1,2 @@
+printline("unterminated string);
+

tests/programs/pos_arithmetic.fzs

@@ -0,0 +1,7 @@
+// Arithmetic precedence and operators.
+printline(2 + 2 * 2);
+printline(-1 + 1);
+printline(2 ^ 2);
+printline(4 % 2);
+printline(10 / 2);
+

tests/programs/pos_class.fzs

@@ -0,0 +1,25 @@
+class Point
+{
+  int x;
+  int y;
+
+  fn move(int dx, int dy)
+  {
+    this.x = this.x + dx;
+    this.y = this.y + dy;
+  }
+}
+
+Point point = new Point;
+point.x = 1;
+point.y = 2;
+point.move(9, 8);
+
+if (point.x == 10 && point.y == 10)
+  printline("class method passed");
+else
+{
+  printline("class method failed");
+  exit(1);
+}
+

tests/programs/pos_comments_strings.fzs

@@ -0,0 +1,5 @@
+// Line comments are ignored by the parser.
+printline('single-quoted string');;;;;
+printline("");
+printline("double-quoted string");
+

tests/programs/pos_conditions.fzs

@@ -0,0 +1,21 @@
+bool flag = true;
+
+if (!flag)
+{
+  printline("unexpected false");
+  exit(1);
+}
+else if (2 + 2 >= 4)
+{
+  printline("condition passed");
+}
+else
+{
+  printline("unexpected branch");
+  exit(1);
+}
+
+{
+  printline("standalone block");
+}
+

tests/programs/pos_functions.fzs

@@ -0,0 +1,21 @@
+fn fib(int n) int
+{
+  if (n <= 1)
+    return n;
+
+  return fib(n - 1) + fib(n - 2);
+}
+
+fn sum(uint a, uint b) uint
+{
+  return a + b;
+}
+
+if (fib(7) == 13 && sum(2, 2) == 4)
+  printline("functions passed");
+else
+{
+  printline("functions failed");
+  exit(1);
+}
+

tests/programs/pos_null.fzs

@@ -0,0 +1,23 @@
+class Item
+{
+  int value;
+}
+
+fn maybe_item(bool create) Item
+{
+  if (create)
+    return new Item;
+
+  return null;
+}
+
+Item empty = maybe_item(false);
+Item present = maybe_item(true);
+if (empty == null && present != null)
+  printline("null handling passed");
+else
+{
+  printline("null handling failed");
+  exit(1);
+}
+

tests/programs/pos_variables.fzs

@@ -0,0 +1,13 @@
+uint work_it = 21 * 2 ^ 2;
+int make_it = 10;
+u64 do_it;
+do_it = 15;
+char make_us;
+str floyd = "hello, Pink Floyd!";
+bool flag = true;
+
+printline(work_it);
+printline(make_it + do_it);
+printline(floyd);
+printline(flag);
+