add additional tests

Author: a-tarasyuk

tests/baselines/reference/typeGuardNarrowsIndexedAccessOfKnownProperty10.js

@@ -0,0 +1,23 @@
+//// [typeGuardNarrowsIndexedAccessOfKnownProperty10.ts]
+enum E {
+    A = "A",
+    B = "B"
+}
+
+declare const m: { [K in E]: string | null };
+
+if (m[E.A] !== null) {
+    m[E.A].toString(); // string
+}
+
+
+//// [typeGuardNarrowsIndexedAccessOfKnownProperty10.js]
+"use strict";
+var E;
+(function (E) {
+    E["A"] = "A";
+    E["B"] = "B";
+})(E || (E = {}));
+if (m[E.A] !== null) {
+    m[E.A].toString(); // string
+}

tests/baselines/reference/typeGuardNarrowsIndexedAccessOfKnownProperty10.symbols

@@ -0,0 +1,31 @@
+=== tests/cases/compiler/typeGuardNarrowsIndexedAccessOfKnownProperty10.ts ===
+enum E {
+>E : Symbol(E, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 0))
+
+    A = "A",
+>A : Symbol(E.A, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 8))
+
+    B = "B"
+>B : Symbol(E.B, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 1, 12))
+}
+
+declare const m: { [K in E]: string | null };
+>m : Symbol(m, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 5, 13))
+>K : Symbol(K, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 5, 20))
+>E : Symbol(E, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 0))
+
+if (m[E.A] !== null) {
+>m : Symbol(m, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 5, 13))
+>E.A : Symbol(E.A, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 8))
+>E : Symbol(E, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 0))
+>A : Symbol(E.A, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 8))
+
+    m[E.A].toString(); // string
+>m[E.A].toString : Symbol(String.toString, Decl(lib.es5.d.ts, --, --))
+>m : Symbol(m, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 5, 13))
+>E.A : Symbol(E.A, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 8))
+>E : Symbol(E, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 0))
+>A : Symbol(E.A, Decl(typeGuardNarrowsIndexedAccessOfKnownProperty10.ts, 0, 8))
+>toString : Symbol(String.toString, Decl(lib.es5.d.ts, --, --))
+}
+

tests/baselines/reference/typeGuardNarrowsIndexedAccessOfKnownProperty10.types

@@ -0,0 +1,37 @@
+=== tests/cases/compiler/typeGuardNarrowsIndexedAccessOfKnownProperty10.ts ===
+enum E {
+>E : E
+
+    A = "A",
+>A : E.A
+>"A" : "A"
+
+    B = "B"
+>B : E.B
+>"B" : "B"
+}
+
+declare const m: { [K in E]: string | null };
+>m : { A: string | null; B: string | null; }
+>null : null
+
+if (m[E.A] !== null) {
+>m[E.A] !== null : boolean
+>m[E.A] : string | null
+>m : { A: string | null; B: string | null; }
+>E.A : E.A
+>E : typeof E
+>A : E.A
+>null : null
+
+    m[E.A].toString(); // string
+>m[E.A].toString() : string
+>m[E.A].toString : () => string
+>m[E.A] : string
+>m : { A: string | null; B: string | null; }
+>E.A : E.A
+>E : typeof E
+>A : E.A
+>toString : () => string
+}
+

tests/cases/compiler/typeGuardNarrowsIndexedAccessOfKnownProperty10.ts

@@ -0,0 +1,12 @@
+// @strict: true
+
+enum E {
+    A = "A",
+    B = "B"
+}
+
+declare const m: { [K in E]: string | null };
+
+if (m[E.A] !== null) {
+    m[E.A].toString(); // string
+}