Extract function tests

src/main/resources/dictionaries/ideavim.dic

@@ -168,6 +168,8 @@ tmapclear
 
 getreg
 getregtype
+tolower
+toupper
 
 endfunction
 

src/main/resources/messages/IdeaVimBundle.properties

@@ -83,10 +83,14 @@ E545=E545: Missing colon: {0}
 E546=E546: Illegal mode: {0}
 E548=E548: Digit expected: {0}
 E549=E549: Illegal percentage: {0}
+E701=E701: Invalid type for len()
+E730=E730: Using a List as a String
+E731=E731: Using a Dictionary as a String
 E774=E774: 'operatorfunc' is empty
 E805=E805: Using a Float as a Number
 e841.reserved.name.cannot.be.used.for.user.defined.command=E841: Reserved name, cannot be used for user defined command
 E939=E939: Positive count required
+E1211=E1211: List required for argument {0}
 E1214=E1214: Digraph must be just two characters: {0}
 
 message.search.hit.bottom=search hit BOTTOM, continuing at TOP

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/BasicStringFunctions.kt

@@ -1,51 +0,0 @@
-/*
- * Copyright 2003-2023 The IdeaVim authors
- *
- * Use of this source code is governed by an MIT-style
- * license that can be found in the LICENSE.txt file or at
- * https://opensource.org/licenses/MIT.
- */
-
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
-
-import org.jetbrains.plugins.ideavim.VimTestCase
-import org.junit.jupiter.api.Test
-
-class BasicStringFunctions : VimTestCase() {
-
-  @Test
-  fun `test toupper`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo toupper('Vim is awesome')"))
-    assertExOutput("VIM IS AWESOME")
-  }
-
-  @Test
-  fun `test tolower`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo tolower('Vim is awesome')"))
-    assertExOutput("vim is awesome")
-  }
-
-  @Test
-  fun `test join`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo join(['Vim', 'is', 'awesome'], '_')"))
-    assertExOutput("Vim_is_awesome")
-  }
-
-  @Test
-  fun `test join without second argument`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo join(['Vim', 'is', 'awesome'])"))
-    assertExOutput("Vim is awesome")
-  }
-
-  @Test
-  fun `test join with wrong first argument type`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo join('Vim is awesome')"))
-    assertPluginError(true)
-    assertPluginErrorMessageContains("E714: List required")
-  }
-}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/BuiltInFunctionTest.kt

@@ -1,180 +0,0 @@
-/*
- * Copyright 2003-2023 The IdeaVim authors
- *
- * Use of this source code is governed by an MIT-style
- * license that can be found in the LICENSE.txt file or at
- * https://opensource.org/licenses/MIT.
- */
-
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
-
-import com.maddyhome.idea.vim.api.injector
-import org.jetbrains.plugins.ideavim.VimTestCase
-import org.junit.jupiter.api.Test
-
-class BuiltInFunctionTest : VimTestCase() {
-
-  @Test
-  fun `test abs`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo abs(-123) abs(2)"))
-    assertExOutput("123 2")
-  }
-
-  @Test
-  fun `test sin`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo sin(0) sin(1)"))
-    assertExOutput("0.0 0.841471")
-  }
-
-  @Test
-  fun `test empty`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo empty(0) empty(1)"))
-    assertExOutput("1 0")
-    typeText(commandToKeys("echo empty(\"123\") empty(\"\")"))
-    assertExOutput("0 1")
-    typeText(commandToKeys("echo empty([1, 2]) empty([])"))
-    assertExOutput("0 1")
-    typeText(commandToKeys("echo empty({1:2}) empty({})"))
-    assertExOutput("0 1")
-  }
-
-  @Test
-  fun `test line`() {
-    configureByText("1\n2\n${c}3\n4\n5")
-    typeText(commandToKeys("echo line('.')"))
-    assertExOutput("3")
-
-    typeText(commandToKeys("echo line('$')"))
-    assertExOutput("5")
-
-    typeText(injector.parser.parseKeys("ma"))
-    typeText(commandToKeys("""echo line("'a") line("'x")"""))
-    assertExOutput("3 0")
-
-    setEditorVisibleSize(screenWidth, 3)
-    setPositionAndScroll(2, 2)
-    typeText(commandToKeys("""echo line("w0") line("w$")"""))
-    assertExOutput("3 5")
-
-    // Without selection - current line
-    typeText(commandToKeys("""echo line("v")"""))
-    assertExOutput("3")
-
-    // With selection - make sure to delete the '<,'> that is automatically prepended when entering Command-line mode
-    // with a selection
-    typeText(injector.parser.parseKeys("vj"))
-    typeText(injector.parser.parseKeys(""":<BS><BS><BS><BS><BS>echo line("v")<CR>"""))
-    assertExOutput("3")
-
-    // Remove selection and check again - note that exiting Command-line mode removes selection and switches back to
-    // Normal. This <esc> does nothing
-    typeText(injector.parser.parseKeys("<esc>"))
-    typeText(commandToKeys("""echo line("v")"""))
-    assertExOutput("3")
-
-    typeText(commandToKeys("""echo line("abs") line(1) line([])"""))
-    assertExOutput("0 0 0")
-
-    typeText(commandToKeys("""echo line([1, 1]) line(['.', '$']) line(['$', '$'])"""))
-    assertExOutput("1 0 0")
-
-    typeText(commandToKeys("""echo line([0, 1]) line([1, 1]) line([5, 1]) line([6, 1]) line([5, 2]) line([5, 3])"""))
-    assertExOutput("0 1 5 0 5 0")
-  }
-
-  // XXX virtualedit is not tested
-  @Test
-  fun `test col`() {
-    configureByText(
-      """
-  1
-  2
-  1234${c}567890
-  4
-  5
-      """.trimIndent(),
-    )
-    typeText(commandToKeys("echo col('.')"))
-    assertExOutput("5")
-
-    typeText(commandToKeys("echo col('$')"))
-    assertExOutput("10")
-
-    typeText(injector.parser.parseKeys("ma"))
-    typeText(commandToKeys("""echo col("'a") col("'z")"""))
-    assertExOutput("5 0")
-
-    // Without selection - current line
-    typeText(commandToKeys("""echo col("v")"""))
-    assertExOutput("5")
-
-    // With selection - make sure to delete the '<,'> that is automatically prepended when entering Command-line mode
-    // with a selection
-    typeText(injector.parser.parseKeys("vll"))
-    typeText(injector.parser.parseKeys(""":<BS><BS><BS><BS><BS>echo col("v")<CR>"""))
-    assertExOutput("5")
-
-    // Remove selection and check again - note that exiting Command-line mode removes selection and switches back to
-    // Normal. This <esc> does nothing
-    typeText(injector.parser.parseKeys("<esc>"))
-    typeText(commandToKeys("""echo col("v")"""))
-    assertExOutput("5")
-
-    typeText(commandToKeys("echo col('$')"))
-    assertExOutput("10")
-
-    typeText(commandToKeys("""echo col("abs") col(1) col([])"""))
-    assertExOutput("0 0 0")
-
-    typeText(commandToKeys("""echo col([1, 1]) col([3, '$'])  col(['.', '$']) col(['$', '$'])"""))
-    assertExOutput("1 11 0 0")
-
-    typeText(commandToKeys("""echo col([0, 1]) col([1, 1]) col([5, 1]) col([6, 1]) col([5, 2])"""))
-    assertExOutput("0 1 1 0 2")
-  }
-
-  @Test
-  fun `test exists`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo exists(\"&nu\")"))
-    assertExOutput("1")
-
-    typeText(commandToKeys("echo exists(\"&unknownOptionName\")"))
-    assertExOutput("0")
-
-    typeText(commandToKeys("echo exists(\"g:myVar\")"))
-    assertExOutput("0")
-
-    enterCommand("let myVar = 42")
-    typeText(commandToKeys("echo exists(\"g:myVar\")"))
-    assertExOutput("1")
-  }
-
-  @Test
-  fun `test len`() {
-    configureByText("\n")
-    typeText(commandToKeys("echo len(123)"))
-    assertExOutput("3")
-
-    typeText(commandToKeys("echo len('abcd')"))
-    assertExOutput("4")
-
-    typeText(commandToKeys("echo len([1])"))
-    assertExOutput("1")
-
-    typeText(commandToKeys("echo len({})"))
-    assertExOutput("0")
-
-    typeText(commandToKeys("echo len(#{1: 'one'})"))
-    assertExOutput("1")
-
-    typeText(commandToKeys("echo len(12 . 4)"))
-    assertExOutput("3")
-
-    typeText(commandToKeys("echo len(4.2)"))
-    assertPluginErrorMessageContains("E701: Invalid type for len()")
-  }
-}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/EmptyFunctionTest.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class EmptyFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test empty`() {
+    assertCommandOutput("echo empty(0) empty(1)", "1 0")
+    assertCommandOutput("echo empty(\"123\") empty(\"\")", "0 1")
+    assertCommandOutput("echo empty([1, 2]) empty([])", "0 1")
+    assertCommandOutput("echo empty({1:2}) empty({})", "0 1")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/LenFunctionTest.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class LenFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test len`() {
+    assertCommandOutput("echo len(123)", "3")
+    assertCommandOutput("echo len('abcd')", "4")
+    assertCommandOutput("echo len([1])", "1")
+    assertCommandOutput("echo len({})", "0")
+    assertCommandOutput("echo len(#{1: 'one'})", "1")
+    assertCommandOutput("echo len(12 . 4)", "3")
+  }
+
+  @Test
+  fun `test len with float causes errors`() {
+    enterCommand("echo len(4.2)")
+    assertPluginErrorMessageContains("E701: Invalid type for len()")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/commandLineFunctions/GetCmdTypeFunctionTest.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2003-2024 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.commandLineFunctions
 
 import com.maddyhome.idea.vim.api.injector
 import com.maddyhome.idea.vim.ui.ex.ExEntryPanel
@@ -48,4 +48,4 @@ class GetCmdTypeFunctionTest : VimTestCase() {
     assertEquals("foo=", (injector.commandLine.getActiveCommandLine() as ExEntryPanel).visibleText)
   }
 
-}
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/cursorFunctions/ColFunctionTest.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.cursorFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.Test
+
+class ColFunctionTest : VimTestCase() {
+  // XXX virtualedit is not tested
+  @Test
+  fun `test col`() {
+    configureByText(
+      """
+  1
+  2
+  1234${c}567890
+  4
+  5
+      """.trimIndent(),
+    )
+
+    assertCommandOutput("echo col('.')", "5")
+    assertCommandOutput("echo col('$')", "10")
+
+    typeText("ma")
+    assertCommandOutput("""echo col("'a") col("'z")""", "5 0")
+
+    // Without selection - current line
+    assertCommandOutput("""echo col("v")""", "5")
+
+    // With selection - make sure to delete the '<,'> that is automatically prepended when entering Command-line mode
+    // with a selection
+    typeText("vll")
+    typeText(":<C-U>echo col(\"v\")<CR>") // enterCommand/assertCommandOutput cannot handle <C-U>!
+    assertExOutput("5")
+
+    // Remove selection and check again - note that exiting Command-line mode removes selection and switches back to
+    // Normal. This <esc> does nothing
+    typeText("<esc>")
+    assertCommandOutput("""echo col("v")""", "5")
+
+    assertCommandOutput("echo col('$')", "10")
+    assertCommandOutput("""echo col("abs") col(1) col([])""", "0 0 0")
+    assertCommandOutput("""echo col([1, 1]) col([3, '$'])  col(['.', '$']) col(['$', '$'])""", "1 11 0 0")
+    assertCommandOutput("""echo col([0, 1]) col([1, 1]) col([5, 1]) col([6, 1]) col([5, 2])""", "0 1 1 0 2")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/cursorFunctions/LineFunctionTest.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.cursorFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.Test
+
+class LineFunctionTest : VimTestCase() {
+  @Test
+  fun `test line`() {
+    configureByText("1\n2\n${c}3\n4\n5")
+
+    assertCommandOutput("echo line('.')", "3")
+    assertCommandOutput("echo line('$')", "5")
+
+    typeText("ma")
+    assertCommandOutput("""echo line("'a") line("'x")""", "3 0")
+
+    setEditorVisibleSize(screenWidth, 3)
+    setPositionAndScroll(2, 2)
+    assertCommandOutput("""echo line("w0") line("w$")""", "3 5")
+
+    // Without selection - current line
+    assertCommandOutput("""echo line("v")""", "3")
+
+    // With selection - make sure to delete the '<,'> that is automatically prepended when entering Command-line mode
+    // with a selection
+    typeText("vj")
+    typeText(""":<C-U>echo line("v")<CR>""")  // enterCommand/assertCommandOutput cannot handle <C-U>!
+    assertExOutput("3")
+
+    // Remove selection and check again - note that exiting Command-line mode removes selection and switches back to
+    // Normal. This <esc> does nothing
+    typeText("<esc>")
+    assertCommandOutput("""echo line("v")""", "3")
+    assertCommandOutput("""echo line("abs") line(1) line([])""", "0 0 0")
+    assertCommandOutput("""echo line([1, 1]) line(['.', '$']) line(['$', '$'])""", "1 0 0")
+    assertCommandOutput(
+      """echo line([0, 1]) line([1, 1]) line([5, 1]) line([6, 1]) line([5, 2]) line([5, 3])""",
+      "0 1 5 0 5 0"
+    )
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/floatFunctions/AbsFunctionTest.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.floatFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class AbsFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test abs`() {
+    assertCommandOutput("echo abs(-123) abs(2)", "123 2")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/floatFunctions/SinFunctionTest.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.floatFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class SinFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test sin`() {
+    assertCommandOutput("echo sin(0) sin(1)", "0.0 0.841471")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/listFunctions/JoinFunctionTest.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.listFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class JoinFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test join`() {
+    assertCommandOutput("echo join(['Vim', 'is', 'awesome'], '_')", "Vim_is_awesome")
+  }
+
+  @Test
+  fun `test join without second argument defaults to spaces`() {
+    assertCommandOutput("echo join(['Vim', 'is', 'awesome'])", "Vim is awesome")
+  }
+
+  @Test
+  fun `test join with wrong first argument type`() {
+    typeText(commandToKeys("echo join('Vim is awesome')"))
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E1211: List required for argument 1")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/listFunctions/SplitFunctionTest.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2003-2023 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.listFunctions
 
 import org.jetbrains.plugins.ideavim.VimTestCase
 import org.junit.jupiter.api.Test

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/stringFunctions/EscapeFunctionTest.kt

@@ -1,17 +1,16 @@
 /*
- * Copyright 2003-2024 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.stringFunctions
 
 import org.jetbrains.plugins.ideavim.VimTestCase
 import org.junit.jupiter.api.Test
 
-
 class EscapeFunctionTest : VimTestCase() {
   @Test
   fun `test escape windows path with spaces`() {
@@ -64,4 +63,4 @@ class EscapeFunctionTest : VimTestCase() {
     typeText(commandToKeys("""echo escape('🎉$🎊$', '$')"""))
     assertExOutput("""🎉\$🎊\$""")
   }
-}
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/stringFunctions/ToLowerFunctionTest.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.stringFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class ToLowerFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test tolower`() {
+    assertCommandOutput("echo tolower('Vim is awesome')", "vim is awesome")
+  }
+
+  @Test
+  fun `test tolower with number coerces to string`() {
+    assertCommandOutput("echo tolower(123)", "123")
+  }
+
+  @Test
+  fun `test tolower with list causes error`() {
+    enterCommand("echo tolower([1, 2, 3])")
+    assertNoExOutput()
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E730: Using a List as a String")
+  }
+
+  @Test
+  fun `test tolower with dict causes error`() {
+    enterCommand("echo tolower({1: 2, 3: 4})")
+    assertNoExOutput()
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E731: Using a Dictionary as a String")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/stringFunctions/ToUpperFunctionTest.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.stringFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class ToUpperFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test toupper`() {
+    assertCommandOutput("echo toupper('Vim is awesome')", "VIM IS AWESOME")
+  }
+
+  @Test
+  fun `test toupper with number coerces to string`() {
+    assertCommandOutput("echo toupper(123)", "123")
+  }
+
+  @Test
+  fun `test toupper with list causes error`() {
+    enterCommand("echo toupper([1, 2, 3])")
+    assertNoExOutput()
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E730: Using a List as a String")
+  }
+
+  @Test
+  fun `test toupper with dict causes error`() {
+    enterCommand("echo toupper({1: 2, 3: 4})")
+    assertNoExOutput()
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E731: Using a Dictionary as a String")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/varFunctions/FuncrefTest.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2003-2023 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.varFunctions
 
 import org.jetbrains.plugins.ideavim.SkipNeovimReason
 import org.jetbrains.plugins.ideavim.TestWithoutNeovim

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/varFunctions/FunctionTest.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2003-2023 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.varFunctions
 
 import org.jetbrains.plugins.ideavim.SkipNeovimReason
 import org.jetbrains.plugins.ideavim.TestWithoutNeovim

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/variousFunctions/ExistsFunctionTest.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.variousFunctions
+
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class ExistsFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test exists`() {
+    assertCommandOutput("echo exists(\"&nu\")", "1")
+    assertCommandOutput("echo exists(\"&unknownOptionName\")", "0")
+    assertCommandOutput("echo exists(\"g:myVar\")", "0")
+    enterCommand("let myVar = 42")
+    assertCommandOutput("echo exists(\"g:myVar\")", "1")
+  }
+}

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/variousFunctions/HasFunctionTest.kt

@@ -1,12 +1,12 @@
 /*
- * Copyright 2003-2023 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
  * https://opensource.org/licenses/MIT.
  */
 
-package org.jetbrains.plugins.ideavim.ex.implementation.functions
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.variousFunctions
 
 import org.jetbrains.plugins.ideavim.SkipNeovimReason
 import org.jetbrains.plugins.ideavim.TestWithoutNeovim

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/functions/handlers/LenFunctionHandler.kt

@@ -11,7 +11,7 @@ package com.maddyhome.idea.vim.vimscript.model.functions.handlers
 import com.intellij.vim.annotations.VimscriptFunction
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimEditor
-import com.maddyhome.idea.vim.ex.ExException
+import com.maddyhome.idea.vim.ex.exExceptionMessage
 import com.maddyhome.idea.vim.vimscript.model.VimLContext
 import com.maddyhome.idea.vim.vimscript.model.datatypes.VimBlob
 import com.maddyhome.idea.vim.vimscript.model.datatypes.VimDataType
@@ -40,7 +40,7 @@ internal class LenFunctionHandler : FunctionHandler() {
       is VimList -> VimInt(argument.values.size)
       is VimDictionary -> VimInt(argument.dictionary.entries.size)
       is VimBlob -> TODO()
-      else -> throw ExException("E701: Invalid type for len()")
+      else -> throw exExceptionMessage("E701") // E701; Invalid type for len()
     }
   }
 }

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/functions/handlers/listFunctions/JoinFunctionHandler.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2023 The IdeaVim authors
+ * Copyright 2003-2025 The IdeaVim authors
  *
  * Use of this source code is governed by an MIT-style
  * license that can be found in the LICENSE.txt file or at
@@ -11,7 +11,7 @@ package com.maddyhome.idea.vim.vimscript.model.functions.handlers.listFunctions
 import com.intellij.vim.annotations.VimscriptFunction
 import com.maddyhome.idea.vim.api.ExecutionContext
 import com.maddyhome.idea.vim.api.VimEditor
-import com.maddyhome.idea.vim.ex.ExException
+import com.maddyhome.idea.vim.ex.exExceptionMessage
 import com.maddyhome.idea.vim.vimscript.model.VimLContext
 import com.maddyhome.idea.vim.vimscript.model.datatypes.VimDataType
 import com.maddyhome.idea.vim.vimscript.model.datatypes.VimList
@@ -30,11 +30,11 @@ internal class JoinFunctionHandler : FunctionHandler() {
     context: ExecutionContext,
     vimContext: VimLContext,
   ): VimDataType {
-    val firstArgument = argumentValues[0].evaluate(editor, context, vimContext)
-    if (firstArgument !is VimList) {
-      throw ExException("E714: List required")
+    val argument1 = argumentValues[0].evaluate(editor, context, vimContext)
+    if (argument1 !is VimList) {
+      throw exExceptionMessage("E1211", "1") // E1211: List required for argument 1
     }
-    val secondArgument = argumentValues.getOrNull(1)?.evaluate(editor, context, vimContext) ?: VimString(" ")
-    return VimString(firstArgument.values.joinToString(secondArgument.asString()) { it.toString() })
+    val argument2 = argumentValues.getOrNull(1)?.evaluate(editor, context, vimContext)?.asString() ?: " "
+    return VimString(argument1.values.joinToString(argument2) { it.toString() })
   }
 }