Add tests

Author: ahejlsberg

tests/baselines/reference/neverUnionIntersection.js

@@ -0,0 +1,17 @@
+//// [neverUnionIntersection.ts]
+type T01 = string | never;
+type T02 = string & never;
+type T03 = string | number | never;
+type T04 = string & number & never;
+type T05 = any | never;
+type T06 = any & never;
+type T07 = undefined | never;
+type T08 = undefined & never;
+type T09 = null | never;
+type T10 = null & never;
+type T11 = { a: string } | never;
+type T12 = { a: string } & never;
+
+
+//// [neverUnionIntersection.js]
+"use strict";

tests/baselines/reference/neverUnionIntersection.symbols

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+=== tests/cases/conformance/types/never/neverUnionIntersection.ts ===
+type T01 = string | never;
+>T01 : Symbol(T01, Decl(neverUnionIntersection.ts, 0, 0))
+
+type T02 = string & never;
+>T02 : Symbol(T02, Decl(neverUnionIntersection.ts, 0, 26))
+
+type T03 = string | number | never;
+>T03 : Symbol(T03, Decl(neverUnionIntersection.ts, 1, 26))
+
+type T04 = string & number & never;
+>T04 : Symbol(T04, Decl(neverUnionIntersection.ts, 2, 35))
+
+type T05 = any | never;
+>T05 : Symbol(T05, Decl(neverUnionIntersection.ts, 3, 35))
+
+type T06 = any & never;
+>T06 : Symbol(T06, Decl(neverUnionIntersection.ts, 4, 23))
+
+type T07 = undefined | never;
+>T07 : Symbol(T07, Decl(neverUnionIntersection.ts, 5, 23))
+
+type T08 = undefined & never;
+>T08 : Symbol(T08, Decl(neverUnionIntersection.ts, 6, 29))
+
+type T09 = null | never;
+>T09 : Symbol(T09, Decl(neverUnionIntersection.ts, 7, 29))
+
+type T10 = null & never;
+>T10 : Symbol(T10, Decl(neverUnionIntersection.ts, 8, 24))
+
+type T11 = { a: string } | never;
+>T11 : Symbol(T11, Decl(neverUnionIntersection.ts, 9, 24))
+>a : Symbol(a, Decl(neverUnionIntersection.ts, 10, 12))
+
+type T12 = { a: string } & never;
+>T12 : Symbol(T12, Decl(neverUnionIntersection.ts, 10, 33))
+>a : Symbol(a, Decl(neverUnionIntersection.ts, 11, 12))
+

tests/baselines/reference/neverUnionIntersection.types

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+=== tests/cases/conformance/types/never/neverUnionIntersection.ts ===
+type T01 = string | never;
+>T01 : string
+
+type T02 = string & never;
+>T02 : never
+
+type T03 = string | number | never;
+>T03 : T03
+
+type T04 = string & number & never;
+>T04 : never
+
+type T05 = any | never;
+>T05 : any
+
+type T06 = any & never;
+>T06 : never
+
+type T07 = undefined | never;
+>T07 : undefined
+
+type T08 = undefined & never;
+>T08 : never
+
+type T09 = null | never;
+>T09 : null
+>null : null
+
+type T10 = null & never;
+>T10 : never
+>null : null
+
+type T11 = { a: string } | never;
+>T11 : { a: string; }
+>a : string
+
+type T12 = { a: string } & never;
+>T12 : never
+>a : string
+

tests/cases/conformance/types/never/neverUnionIntersection.ts

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+// @strict: true
+
+type T01 = string | never;
+type T02 = string & never;
+type T03 = string | number | never;
+type T04 = string & number & never;
+type T05 = any | never;
+type T06 = any & never;
+type T07 = undefined | never;
+type T08 = undefined & never;
+type T09 = null | never;
+type T10 = null & never;
+type T11 = { a: string } | never;
+type T12 = { a: string } & never;