added simple completion tests

src/org/jetbrains/plugins/hocon/ref/HoconPropertyLookupElement.scala

@@ -23,4 +23,9 @@ class HoconPropertyLookupElement(resField: ResolvedField) extends LookupElement
   override def getObject: ResolvedField = resField
 
   override def getPsiElement: PsiElement = resField.hkey
+
+  def repr: String = {
+    val resValue = resField.resolveValue
+    s"$getLookupString (${resValue.typeHint})${resValue.valueHint}"
+  }
 }

test/org/jetbrains/plugins/hocon/completion/HoconCompletionTest.scala

@@ -0,0 +1,44 @@
+package org.jetbrains.plugins.hocon
+package completion
+
+import com.intellij.codeInsight.completion.CompletionType
+import com.intellij.testFramework.fixtures.BasePlatformTestCase
+import org.jetbrains.plugins.hocon.ref.HoconPropertyLookupElement
+import org.junit.Assert.assertEquals
+
+class HoconCompletionTest extends BasePlatformTestCase {
+
+  override def getTestDataPath: String = "testdata/completion"
+
+  def testToplevel(): Unit = testCompletion(
+    "moar (number) = 5",
+    "top (object) = {...}",
+  )
+
+  def testInner(): Unit = testCompletion(
+    "arr (array) = [...]",
+    "boo (boolean) = true",
+    "nul (null) = null",
+    "num (number) = 2",
+    "obj (object) = {...}",
+    "str (string) = kek",
+  )
+
+  def testInner2(): Unit = testInner()
+
+  def testToplevelSub(): Unit = testCompletion(
+    "value ()",
+    "moar (number) = 5",
+    "top (object) = {...}",
+  )
+
+  def testInnerSub(): Unit = testInner()
+
+  private def testCompletion(expected: String*): Unit = {
+    myFixture.configureByFiles(s"${getTestName(true)}.conf", "included.conf")
+    val lookups = myFixture.complete(CompletionType.BASIC) map {
+      case hple: HoconPropertyLookupElement => hple.repr
+    }
+    assertEquals(lookups.toSeq, expected)
+  }
+}

test/org/jetbrains/plugins/hocon/highlight/HoconHighlightUsagesTest.scala

@@ -13,8 +13,6 @@ class HoconHighlightUsagesTest extends BasePlatformTestCase {
 
   override def getTestDataPath: String = "testdata/highlightUsages"
 
-  override def isWriteActionRequired: Boolean = false
-
   def testSimple(): Unit = testUsages(
     (0, 0, 3),
     (1, 0, 3),

testdata/completion/included.conf

@@ -0,0 +1,11 @@
+top {
+  str = kek
+  num = 2
+  boo = true
+  nul = null
+  arr = [1, 2, 3]
+  obj {
+    sub = foo
+  }
+}
+moar = 5

testdata/completion/inner.conf

@@ -0,0 +1,2 @@
+include "included"
+top.<caret>

testdata/completion/inner2.conf

@@ -0,0 +1,4 @@
+include "included"
+top {
+  <caret>
+}

testdata/completion/innerSub.conf

@@ -0,0 +1,2 @@
+include "included"
+value = ${top.<caret>}

testdata/completion/toplevel.conf

@@ -0,0 +1,2 @@
+include "included"
+<caret>

testdata/completion/toplevelSub.conf

@@ -0,0 +1,2 @@
+include "included"
+value = ${<caret>}