Add exponentiation test for runtime (#899)

Author: swernli

src/Qir/Tests/QIR-static/qir-test-math.cpp

@@ -23,6 +23,7 @@ extern "C" uint64_t Microsoft__Quantum__Testing__QIR__Math__SinhTest__Interop();
 extern "C" uint64_t Microsoft__Quantum__Testing__QIR__Math__CoshTest__Interop();          // NOLINT
 extern "C" uint64_t Microsoft__Quantum__Testing__QIR__Math__TanhTest__Interop();          // NOLINT
 extern "C" uint64_t Microsoft__Quantum__Testing__QIR__Math__IeeeRemainderTest__Interop(); // NOLINT
+extern "C" uint64_t Microsoft__Quantum__Testing__QIR__Math__ExponentTest__Interop();      // NOLINT
 extern "C" int64_t Microsoft__Quantum__Testing__QIR__Math__TestDrawRandomInt__Interop(    // NOLINT
     int64_t min, int64_t max);
 extern "C" double Microsoft__Quantum__Testing__QIR__Math__TestDrawRandomDouble__Interop( // NOLINT
@@ -98,6 +99,11 @@ TEST_CASE("QIR: Math.IeeeRemainder", "[qir.math][qir.Math.IeeeRemainder]")
     REQUIRE(0 == Microsoft__Quantum__Testing__QIR__Math__IeeeRemainderTest__Interop());
 }
 
+TEST_CASE("QIR: Math.Exponent.builtin", "[qir.math][qir.Math.Exponent.builtin]")
+{
+    REQUIRE(0 == Microsoft__Quantum__Testing__QIR__Math__ExponentTest__Interop());
+}
+
 TEST_CASE("QIR: Math.DrawRandomInt", "[qir.math][qir.Math.DrawRandomInt]")
 {
     // Test that the Q# random number generator is a wrapper around the C++ generator:

src/Qir/Tests/QIR-static/qsharp/qir-test-math.qs

@@ -346,4 +346,9 @@ namespace Microsoft.Quantum.Testing.QIR.Math {
         return 0;
     }
 
+    @EntryPoint()
+    function ExponentTest() : Int {
+        return (2 ^ 2) - 4;
+    }
+
 }