Add tests

Author: Smit-create

integration_tests/CMakeLists.txt

@@ -480,6 +480,7 @@ RUN(NAME expr_18    FAIL     LABELS cpython llvm c)
 RUN(NAME expr_19             LABELS cpython llvm c)
 RUN(NAME expr_20             LABELS cpython llvm c)
 RUN(NAME expr_21             LABELS cpython llvm c)
+RUN(NAME expr_22             LABELS cpython llvm c)
 
 RUN(NAME expr_01u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_02u            LABELS cpython llvm c NOFAST)

integration_tests/expr_22.py

@@ -0,0 +1,10 @@
+from lpython import f64
+
+# test issue 1671
+def test_fast_fma() -> f64:
+    a : f64 = 5.00
+    a = a + a * 10.00
+    assert abs(a - 55.00) < 1e-12
+    return a
+
+print(test_fast_fma())