add func rank tests

internal/lsp/lsp_test.go

@@ -34,7 +34,7 @@ func testLSP(t *testing.T, exporter packagestest.Exporter) {
 
 	// We hardcode the expected number of test cases to ensure that all tests
 	// are being executed. If a test is added, this number must be changed.
-	const expectedCompletionsCount = 60
+	const expectedCompletionsCount = 63
 	const expectedDiagnosticsCount = 13
 	const expectedFormatCount = 3
 	const expectedDefinitionsCount = 16

internal/lsp/testdata/func_rank/func_rank.go.in

@@ -0,0 +1,12 @@
+package func_rank
+
+var stringAVar = "var" //@item(stringAVar, "stringAVar", "string", "var")
+func stringBFunc() string { return "str" } //@item(stringBFunc, "stringBFunc()", "string", "func")
+type stringer struct{}   //@item(stringer, "stringer", "struct{...}", "struct")
+
+func _() stringer //@complete("tr", stringer, stringAVar, stringBFunc)
+
+func _(val stringer) {} //@complete("tr", stringer, stringAVar, stringBFunc)
+
+func (stringer) _() {} //@complete("tr", stringer, stringAVar, stringBFunc)
+