[tests] Add test for import statement

Signed-off-by: Manas <manas18244@iiitd.ac.in>

Author: weirdsmiley

tests/test_import.ql

@@ -0,0 +1,7 @@
+
+import complex_expr_lib::sin;
+
+fn main() : f64 {
+  let x = 2;
+  return sin(x);
+}

tests/tests.rs

@@ -348,6 +348,24 @@ fn test_ast_gen() -> Result<(), Box<dyn std::error::Error>>  {
         |_ (n: float64 * factorial$factorial: float64 ((n: float64 - 1)))
 
 
+");
+
+    test!("tests/test_import.ql",
+"|_ complex_expr_lib			// @complex_expr_lib.ql:1:1
+  |_ fn complex_expr_lib$bar () : qubit		// @complex_expr_lib.ql:2:4
+    |_ 0q1_0
+
+  |_ fn complex_expr_lib$sin (r: float64) : float64		// @complex_expr_lib.ql:6:4
+    |_ (r: float64 / 180)
+
+  |_ fn complex_expr_lib$cos (r: float64) : float64		// @complex_expr_lib.ql:10:4
+    |_ (r: float64 / 90)
+
+|_ test_import			// @test_import.ql:1:1
+  |_ fn test_import$main () : float64		// @test_import.ql:4:4
+    |_ x: float64 = 2
+    |_ complex_expr_lib$sin: float64 (x: float64)
+
 ");
 
     test!("examples/toss.ql",