diff --git a/src/main/java/de/bixilon/minosoft/commands/errors/reader/number/NegativeNumberError.kt b/src/main/java/de/bixilon/minosoft/commands/errors/reader/number/NegativeNumberError.kt
new file mode 100644
index 000000000..cf377649d
--- /dev/null
+++ b/src/main/java/de/bixilon/minosoft/commands/errors/reader/number/NegativeNumberError.kt
@@ -0,0 +1,22 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2022 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.commands.errors.reader.number
+
+import de.bixilon.minosoft.commands.errors.ReaderError
+import de.bixilon.minosoft.commands.util.CommandReader
+
+class NegativeNumberError(
+    reader: CommandReader,
+    pointer: Int,
+) : ReaderError(reader, pointer, pointer + 1)
diff --git a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParser.kt b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParser.kt
index 88316c774..5e5f840db 100644
--- a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParser.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParser.kt
@@ -24,7 +24,7 @@ import de.bixilon.minosoft.util.BitByte.isBitMask
 import de.bixilon.minosoft.util.KUtil.toResourceLocation
 
 class DoubleParser(
-    val min: Double = Double.MIN_VALUE,
+    val min: Double = -Double.MAX_VALUE,
     val max: Double = Double.MAX_VALUE,
 ) : BrigadierParser<Double> {
     override val examples: List<Double> = listOf(1.0, -1.0, 1000.0)
@@ -54,18 +54,13 @@ class DoubleParser(
 
         override fun read(buffer: PlayInByteBuffer): DoubleParser {
             val flags = buffer.readUnsignedByte()
-            val min = if (flags.isBitMask(0x01)) buffer.readDouble() else Double.MIN_VALUE
+            val min = if (flags.isBitMask(0x01)) buffer.readDouble() else -Double.MAX_VALUE
             val max = if (flags.isBitMask(0x03)) buffer.readDouble() else Double.MAX_VALUE
             return DoubleParser(min = min, max = max)
         }
 
         fun CommandReader.readDouble(): Double? {
-            val string = readUnquotedString() ?: return null
-            return try {
-                string.toDouble()
-            } catch (exception: NumberFormatException) {
-                null
-            }
+            return readNumeric()?.toDoubleOrNull()
         }
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParser.kt b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParser.kt
index 0805e7f39..b473f2304 100644
--- a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParser.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParser.kt
@@ -24,7 +24,7 @@ import de.bixilon.minosoft.util.BitByte.isBitMask
 import de.bixilon.minosoft.util.KUtil.toResourceLocation
 
 class FloatParser(
-    val min: Float = Float.MIN_VALUE,
+    val min: Float = -Float.MAX_VALUE,
     val max: Float = Float.MAX_VALUE,
 ) : BrigadierParser<Float> {
     override val examples: List<Float> = listOf(1.0f, -1.0f, 1000.0f)
@@ -54,18 +54,13 @@ class FloatParser(
 
         override fun read(buffer: PlayInByteBuffer): FloatParser {
             val flags = buffer.readUnsignedByte()
-            val min = if (flags.isBitMask(0x01)) buffer.readFloat() else Float.MIN_VALUE
+            val min = if (flags.isBitMask(0x01)) buffer.readFloat() else -Float.MAX_VALUE
             val max = if (flags.isBitMask(0x03)) buffer.readFloat() else Float.MAX_VALUE
             return FloatParser(min = min, max = max)
         }
 
         fun CommandReader.readFloat(): Float? {
-            val string = readUnquotedString() ?: return null
-            return try {
-                string.toFloat()
-            } catch (exception: NumberFormatException) {
-                null
-            }
+            return readNumeric()?.toFloatOrNull()
         }
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParser.kt b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParser.kt
index 310b87965..925b98b29 100644
--- a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParser.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParser.kt
@@ -60,12 +60,7 @@ class IntParser(
         }
 
         fun CommandReader.readInt(): Int? {
-            val string = readUnquotedString() ?: return null
-            return try {
-                string.toInt()
-            } catch (exception: NumberFormatException) {
-                null
-            }
+            return readNumeric(decimal = false)?.toIntOrNull()
         }
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParser.kt b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParser.kt
index cb6d0c20c..8c838db85 100644
--- a/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParser.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParser.kt
@@ -60,12 +60,7 @@ class LongParser(
         }
 
         fun CommandReader.readLong(): Long? {
-            val string = readUnquotedString() ?: return null
-            return try {
-                string.toLong()
-            } catch (exception: NumberFormatException) {
-                null
-            }
+            return readNumeric(decimal = false)?.toLongOrNull()
         }
     }
 }
diff --git a/src/main/java/de/bixilon/minosoft/commands/parser/factory/ArgumentParserFactories.kt b/src/main/java/de/bixilon/minosoft/commands/parser/factory/ArgumentParserFactories.kt
index 3c2aad8b9..3f4eefb35 100644
--- a/src/main/java/de/bixilon/minosoft/commands/parser/factory/ArgumentParserFactories.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/parser/factory/ArgumentParserFactories.kt
@@ -23,8 +23,8 @@ import de.bixilon.minosoft.data.registries.factory.DefaultFactory
 
 object ArgumentParserFactories : DefaultFactory<ArgumentParserFactory<*>>(
     BooleanParser,
-    DoubleParser,
     FloatParser,
+    DoubleParser,
     IntParser,
     LongParser,
     StringParser,
diff --git a/src/main/java/de/bixilon/minosoft/commands/util/CommandReader.kt b/src/main/java/de/bixilon/minosoft/commands/util/CommandReader.kt
index e54e83d84..2f6cec19a 100644
--- a/src/main/java/de/bixilon/minosoft/commands/util/CommandReader.kt
+++ b/src/main/java/de/bixilon/minosoft/commands/util/CommandReader.kt
@@ -14,6 +14,7 @@
 package de.bixilon.minosoft.commands.util
 
 import de.bixilon.minosoft.commands.errors.reader.*
+import de.bixilon.minosoft.commands.errors.reader.number.NegativeNumberError
 
 open class CommandReader(val string: String) {
     var pointer = 0
@@ -205,6 +206,54 @@ open class CommandReader(val string: String) {
         return string
     }
 
+    fun readUntil(vararg chars: Int, required: Boolean = false): String? {
+        if (!canPeekNext()) {
+            return null
+        }
+        val builder = StringBuilder()
+        while (true) {
+            val peek = peek()
+            if (peek == null) {
+                if (required) {
+                    throw OutOfBoundsError(this, length - 1)
+                }
+                return builder.toString()
+            }
+            if (peek in chars) {
+                return builder.toString()
+            }
+            builder.appendCodePoint(peek)
+            pointer++
+        }
+    }
+
+    fun readNumeric(decimal: Boolean = true, negative: Boolean = true): String? {
+        if (!canPeekNext()) {
+            return null
+        }
+        val builder = StringBuilder()
+        while (true) {
+            val peek = peek() ?: break
+            if (peek in '0'.code..'9'.code) {
+                builder.appendCodePoint(peek)
+                pointer++
+                continue
+            } else if (peek == '-'.code && builder.isEmpty()) {
+                if (!negative) {
+                    throw NegativeNumberError(this, pointer)
+                }
+                builder.appendCodePoint(peek)
+                pointer++
+            } else if (decimal && peek == '.'.code && '.' !in builder) {
+                builder.appendCodePoint(peek)
+                pointer++
+            } else {
+                break
+            }
+        }
+        return builder.toString()
+    }
+
     fun <T> readResult(reader: CommandReader.() -> T): ReadResult<T> {
         val start = pointer
         val result = reader(this)
diff --git a/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParserTest.kt b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParserTest.kt
new file mode 100644
index 000000000..edb441899
--- /dev/null
+++ b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_double/DoubleParserTest.kt
@@ -0,0 +1,130 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2022 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.commands.parser.brigadier._double
+
+import de.bixilon.minosoft.commands.util.CommandReader
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import kotlin.test.assertEquals
+
+internal class DoubleParserTest {
+
+    @Test
+    fun readNormal() {
+        val reader = CommandReader("1")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), 1.0)
+    }
+
+    @Test
+    fun readNegative() {
+        val reader = CommandReader("-1")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), -1.0)
+    }
+
+    @Test
+    fun readTwice() {
+        val reader = CommandReader("5,1")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), 5.0)
+        reader.read()
+        assertEquals(parser.parse(reader), 1.0)
+    }
+
+    @Test
+    fun readDecimal() {
+        val reader = CommandReader("1.1")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), 1.1)
+    }
+
+    @Test
+    fun readNegativeDecimal() {
+        val reader = CommandReader("-1.1")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), -1.1)
+    }
+
+
+    @Test
+    fun readNoDecimal() {
+        val reader = CommandReader("-1.0")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), -1.0)
+    }
+
+    @Test
+    fun readInvalid() {
+        val reader = CommandReader("abc")
+        val parser = DoubleParser()
+        assertThrows<DoubleParseError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun readBigNumber() {
+        val reader = CommandReader("123456.7891")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), 123456.7891)
+    }
+
+    @Test
+    fun readNegativeBigNumber() {
+        val reader = CommandReader("-123456.7891")
+        val parser = DoubleParser()
+        assertEquals(parser.parse(reader), -123456.7891)
+    }
+
+    @Test
+    fun checkMin() {
+        val reader = CommandReader("5")
+        val parser = DoubleParser(min = 0.0)
+        assertEquals(parser.parse(reader), 5.0)
+    }
+
+    @Test
+    fun checkMinError() {
+        val reader = CommandReader("-2")
+        val parser = DoubleParser(min = 0.0)
+        assertThrows<DoubleOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMax() {
+        val reader = CommandReader("3")
+        val parser = DoubleParser(max = 5.0)
+        assertEquals(parser.parse(reader), 3.0)
+    }
+
+    @Test
+    fun checkMaxError() {
+        val reader = CommandReader("10")
+        val parser = DoubleParser(max = 8.0)
+        assertThrows<DoubleOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMinMax() {
+        val reader = CommandReader("4")
+        val parser = DoubleParser(min = 3.0, max = 5.0)
+        assertEquals(parser.parse(reader), 4.0)
+    }
+
+    @Test
+    fun checkMinMaxError() {
+        val reader = CommandReader("1")
+        val parser = DoubleParser(min = 2.0, max = 8.0)
+        assertThrows<DoubleOutOfRangeError> { parser.parse(reader) }
+    }
+}
diff --git a/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParserTest.kt b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParserTest.kt
new file mode 100644
index 000000000..ad6f330e8
--- /dev/null
+++ b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_float/FloatParserTest.kt
@@ -0,0 +1,130 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2022 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.commands.parser.brigadier._float
+
+import de.bixilon.minosoft.commands.util.CommandReader
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import kotlin.test.assertEquals
+
+internal class FloatParserTest {
+
+    @Test
+    fun readNormal() {
+        val reader = CommandReader("1")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), 1.0f)
+    }
+
+    @Test
+    fun readNegative() {
+        val reader = CommandReader("-1")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), -1.0f)
+    }
+
+    @Test
+    fun readTwice() {
+        val reader = CommandReader("5,1")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), 5.0f)
+        reader.read()
+        assertEquals(parser.parse(reader), 1.0f)
+    }
+
+    @Test
+    fun readDecimal() {
+        val reader = CommandReader("1.1")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), 1.1f)
+    }
+
+    @Test
+    fun readNegativeDecimal() {
+        val reader = CommandReader("-1.1")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), -1.1f)
+    }
+
+
+    @Test
+    fun readNoDecimal() {
+        val reader = CommandReader("-1.0")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), -1.0f)
+    }
+
+    @Test
+    fun readInvalid() {
+        val reader = CommandReader("abc")
+        val parser = FloatParser()
+        assertThrows<FloatParseError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun readBigNumber() {
+        val reader = CommandReader("123456.7891")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), 123456.7891f)
+    }
+
+    @Test
+    fun readNegativeBigNumber() {
+        val reader = CommandReader("-123456.7891")
+        val parser = FloatParser()
+        assertEquals(parser.parse(reader), -123456.7891f)
+    }
+
+    @Test
+    fun checkMin() {
+        val reader = CommandReader("5")
+        val parser = FloatParser(min = 0.0f)
+        assertEquals(parser.parse(reader), 5.0f)
+    }
+
+    @Test
+    fun checkMinError() {
+        val reader = CommandReader("-2")
+        val parser = FloatParser(min = 0.0f)
+        assertThrows<FloatOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMax() {
+        val reader = CommandReader("3")
+        val parser = FloatParser(max = 5.0f)
+        assertEquals(parser.parse(reader), 3.0f)
+    }
+
+    @Test
+    fun checkMaxError() {
+        val reader = CommandReader("10")
+        val parser = FloatParser(max = 8.0f)
+        assertThrows<FloatOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMinMax() {
+        val reader = CommandReader("4")
+        val parser = FloatParser(min = 3.0f, max = 5.0f)
+        assertEquals(parser.parse(reader), 4.0f)
+    }
+
+    @Test
+    fun checkMinMaxError() {
+        val reader = CommandReader("1")
+        val parser = FloatParser(min = 2.0f, max = 8.0f)
+        assertThrows<FloatOutOfRangeError> { parser.parse(reader) }
+    }
+}
diff --git a/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParserTest.kt b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParserTest.kt
new file mode 100644
index 000000000..a2599192b
--- /dev/null
+++ b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_int/IntParserTest.kt
@@ -0,0 +1,115 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2022 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.commands.parser.brigadier._int
+
+import de.bixilon.minosoft.commands.util.CommandReader
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import kotlin.test.assertEquals
+
+internal class IntParserTest {
+
+    @Test
+    fun readNormal() {
+        val reader = CommandReader("1")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), 1)
+    }
+
+    @Test
+    fun readNegative() {
+        val reader = CommandReader("-1")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), -1)
+    }
+
+    @Test
+    fun readTwice() {
+        val reader = CommandReader("5,1")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), 5)
+        reader.read()
+        assertEquals(parser.parse(reader), 1)
+    }
+
+    @Test
+    fun readDecimal() {
+        val reader = CommandReader("-1.1")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), -1)
+    }
+
+    @Test
+    fun readInvalid() {
+        val reader = CommandReader("abc")
+        val parser = IntParser()
+        assertThrows<IntParseError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun readBigNumber() {
+        val reader = CommandReader("1234567891")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), 1234567891)
+    }
+
+    @Test
+    fun readNegativeBigNumber() {
+        val reader = CommandReader("-1234567891")
+        val parser = IntParser()
+        assertEquals(parser.parse(reader), -1234567891)
+    }
+
+    @Test
+    fun checkMin() {
+        val reader = CommandReader("5")
+        val parser = IntParser(min = 0)
+        assertEquals(parser.parse(reader), 5)
+    }
+
+    @Test
+    fun checkMinError() {
+        val reader = CommandReader("-2")
+        val parser = IntParser(min = 0)
+        assertThrows<IntOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMax() {
+        val reader = CommandReader("3")
+        val parser = IntParser(max = 5)
+        assertEquals(parser.parse(reader), 3)
+    }
+
+    @Test
+    fun checkMaxError() {
+        val reader = CommandReader("10")
+        val parser = IntParser(max = 8)
+        assertThrows<IntOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMinMax() {
+        val reader = CommandReader("4")
+        val parser = IntParser(min = 3, max = 5)
+        assertEquals(parser.parse(reader), 4)
+    }
+
+    @Test
+    fun checkMinMaxError() {
+        val reader = CommandReader("1")
+        val parser = IntParser(min = 2, max = 8)
+        assertThrows<IntOutOfRangeError> { parser.parse(reader) }
+    }
+}
diff --git a/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParserTest.kt b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParserTest.kt
new file mode 100644
index 000000000..b10416243
--- /dev/null
+++ b/src/test/java/de/bixilon/minosoft/commands/parser/brigadier/_long/LongParserTest.kt
@@ -0,0 +1,115 @@
+/*
+ * Minosoft
+ * Copyright (C) 2020-2022 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.commands.parser.brigadier._long
+
+import de.bixilon.minosoft.commands.util.CommandReader
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import kotlin.test.assertEquals
+
+internal class LongParserTest {
+
+    @Test
+    fun readNormal() {
+        val reader = CommandReader("1")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), 1)
+    }
+
+    @Test
+    fun readNegative() {
+        val reader = CommandReader("-1")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), -1)
+    }
+
+    @Test
+    fun readTwice() {
+        val reader = CommandReader("5,1")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), 5)
+        reader.read()
+        assertEquals(parser.parse(reader), 1)
+    }
+
+    @Test
+    fun readDecimal() {
+        val reader = CommandReader("-1.1")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), -1)
+    }
+
+    @Test
+    fun readInvalid() {
+        val reader = CommandReader("abc")
+        val parser = LongParser()
+        assertThrows<LongParseError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun readBigNumber() {
+        val reader = CommandReader("123456789234567891")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), 123456789234567891L)
+    }
+
+    @Test
+    fun readNegativeBigNumber() {
+        val reader = CommandReader("-123456789234567891")
+        val parser = LongParser()
+        assertEquals(parser.parse(reader), -123456789234567891L)
+    }
+
+    @Test
+    fun checkMin() {
+        val reader = CommandReader("5")
+        val parser = LongParser(min = 0)
+        assertEquals(parser.parse(reader), 5)
+    }
+
+    @Test
+    fun checkMinError() {
+        val reader = CommandReader("-2")
+        val parser = LongParser(min = 0)
+        assertThrows<LongOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMax() {
+        val reader = CommandReader("3")
+        val parser = LongParser(max = 5)
+        assertEquals(parser.parse(reader), 3)
+    }
+
+    @Test
+    fun checkMaxError() {
+        val reader = CommandReader("10")
+        val parser = LongParser(max = 8)
+        assertThrows<LongOutOfRangeError> { parser.parse(reader) }
+    }
+
+    @Test
+    fun checkMinMax() {
+        val reader = CommandReader("4")
+        val parser = LongParser(min = 3, max = 5)
+        assertEquals(parser.parse(reader), 4)
+    }
+
+    @Test
+    fun checkMinMaxError() {
+        val reader = CommandReader("1")
+        val parser = LongParser(min = 2, max = 8)
+        assertThrows<LongOutOfRangeError> { parser.parse(reader) }
+    }
+}