Added tests on intersection types.

tests/cases/conformance/types/typeRelationships/matchable/equalityWithIntersectionTypes01.ts

@@ -0,0 +1,24 @@
+interface I1 {
+    p1: number
+}
+
+interface I2 extends I1 {
+    p2: number;
+}
+
+interface I3 {
+    p3: number;
+}
+
+var x = { p1: 10, p2: 20, p3: 30 };
+var y: I1 & I3 = x;
+var z: I2 = x;
+
+if (y === z || z === y) {
+}
+else if (y !== z || z !== y) {
+}
+else if (y == z || z == y) {
+}
+else if (y != z || z != y) {
+}

tests/cases/conformance/types/typeRelationships/matchable/switchCaseWithIntersectionTypes01.ts

@@ -0,0 +1,25 @@
+
+var strAndNum: string & number;
+var numAndBool: number & boolean;
+var str: string;
+var num: number;
+var bool: boolean;
+
+switch (strAndNum) {
+    // Identical
+    case strAndNum:
+        break;
+
+    // Constituents
+    case str:
+    case num:
+        break;
+
+    // Overlap in constituents
+    case numAndBool:
+        break;
+
+    // No relation
+    case bool:
+        break;
+}

tests/cases/conformance/types/typeRelationships/matchable/typeAssertionsWithIntersectionTypes01.ts

@@ -0,0 +1,20 @@
+interface I1 {
+    p1: number
+}
+
+interface I2 extends I1 {
+    p2: number;
+}
+
+interface I3 {
+    p3: number;
+}
+
+var x = { p1: 10, p2: 20, p3: 30 };
+var y: I1 & I3 = x;
+var z: I2 = x;
+
+var a = <I1 & I3>z;
+var b = <I3>z;
+var c = <I2>z;
+var d = <I1>y;