[Analysis API] Add reference resolution tests for code fragments

analysis/analysis-api/testData/referenceResolve/codeFragment/blockCodeFragment/BinaryExpression.kt

@@ -0,0 +1,19 @@
+// IGNORE_FE10
+
+// MODULE: context
+
+// FILE: context.kt
+fun test() {
+    <caret_context>Unit
+}
+
+val a: Int = 0
+val b: Int = 5
+
+
+// MODULE: main
+// MODULE_KIND: CodeFragment
+
+// FILE: fragment.kt
+// CODE_FRAGMENT_KIND: BLOCK
+a <caret>+ b